machine learning engineer

ai engineer

data engineer

senior software engineer

software engineer

senior backend engineer

Zoopla

<div>Who We Are
Zoopla is one of the UK&rsquo;s most instantly recognisable property brands. In fact, we&rsquo;re known and loved by over 91% of the nation (and we&rsquo;re working hard on the other 9%). Our mission is to help the nation make better home decisions - by connecting everyone to their home and giving them personalised insights to help with moving, managing or financing. Over 50 million people visit Zoopla every month to access exclusive data and information on every UK property, search over 500,000 homes for sale and rent, find the best agents and secure the latest mortgage deals.
We&rsquo;re a growing, dynamic team that embraces innovation and isn&rsquo;t afraid to push the boundaries. We&rsquo;re only just starting our journey to redefine the digital property landscape, with much more to explore and achieve. Join us, and transform the way the nation makes home decisions.
What You'll Do
At Zoopla you will design and run the search and retrieval systems behind the consumer portal, serving millions of users. Search relevance, ranking, and the services and data pipelines that feed them sit at the centre of this role. If you care about robust APIs, fast and relevant search, scalable distributed services, observability, and personalisation, this is for you.
You will work primarily in Python and TypeScript across Node.js and GraphQL, with some services in Golang or Perl. You will own search infrastructure end to end on OpenSearch (or Elasticsearch): indexing, query design, relevance tuning, and performance at scale. You will design and maintain the APIs and data pipelines that power it, working across both SQL and NoSQL stores on AWS.
This is a backend role. You will touch the frontend (React and TypeScript) occasionally when a feature needs it, but deep frontend specialism is not expected.
Requirements (all essential)<ul><li>
Senior engineer who has built and operated high scale systems serving millions of users, and who can point to the trade offs they made to get there.</li><li>
Production experience with OpenSearch or Elasticsearch: indexing strategy, query and relevance tuning, and keeping clusters healthy under load.</li><li>
Strong distributed systems and systems design skills, with the ability to reason about consistency, latency, failure modes, and scale.</li><li>
Hands on AWS experience running services in production.</li><li>
Fluency in backend development with Python and TypeScript, designing and building APIs and services across SQL and NoSQL stores.</li><li>
A genuine passion for shipping product features with a high level of autonomy and agency, taking an idea from problem to production with minimal hand holding.</li><li>
Excellent communication skills and a track record of working closely with Product and Design to turn ambiguous goals into shipped features.</li></ul>
Also valued<ul><li>
Solid engineering craft: maintainable code, code review, pairing when it helps, and meaningful tests.</li><li>
Building for stability, security, observability, and performance, not just the happy path.</li><li>
A commercial mindset that connects your work to business outcomes.</li><li>
You use AI tools as a core part of how you build, from coding assistants to AI driven workflows, and you have a strong sense of where they speed you up and where they need checking.</li></ul>
Where you&rsquo;ll be
At Zoopla, we embrace hybrid working but emphasise the importance of also spending time together. You&rsquo;ll have the opportunity to work remotely (at home) for two days per week with Mondays and Thursdays as all-Zoopla days in the office together plus a third day in-office day of your choosing.
Our home in Tower Bridge is a buzzing hub for collaborative and individual working, with areas to socialise and exercise - within easy reach of London Bridge, Tower Hill and Bermondsey stations. On our doorstep there are plenty of great food spots including a new indoor street food market and landscaped areas to sit by the riverside. 
Benefits 
<ul><li>
Our hybrid setup means you&rsquo;ll join us in the Tower Bridge office 3 days each week</li><li>
25 days annual leave + additional leave benefits Including extra days for length of service, plus other leave perks</li><li>
Cycle to work and electric car schemes</li><li>
Free Calm App membership</li><li>
Enhanced Parental leave</li><li>
Fertility Treatment Financial Support</li><li>
Group Income Protection and private medical insurance</li><li>
Gym on-site in London</li><li>
7.5% pension contribution by the company</li><li>
Discretionary annual bonus up to 10% of base salary</li></ul></div>

Senior Backend Engineer (Search)

Harmonic Security

<div>AI is being run everywhere, by humans and agents. Harmonic Security governs all of it. The AI Governance and Control (AIGC) platform understands user / agent intent and data context in real time, giving security teams visibility and control across every tool and workflow so companies can move faster with AI while minimizing risk.
We operate in one of the fastest-moving spaces in tech: the emerging intersection of AI and cybersecurity. It's a market still being defined, and we're among the first to build natively for it - protecting sensitive data in real time, at the endpoint, with minimal friction for the teams using it. Enterprises get full visibility and control. Their people get to innovate without guardrails slowing them down.
Named to the Rising in Cyber 2026 list, Harmonic is gaining serious recognition and serious traction. We're led by deep cybersecurity expertise and backed by investors who know the space: N47, Ten Eleven Ventures, and In-Q-Tel.
As AI adoption inside the enterprise accelerates, the ability to safely observe, control, and enforce policy in real time isn't a nice-to-have. It's mission-critical infrastructure. That's what we build.<h2 class="jobSectionHeader">
How We Work: AI-First by Design</h2>
Harmonic exists to help enterprises adopt AI safely and at scale. We hold ourselves to that same standard. Everyone here actively leverages AI tools to perform their best work &mdash; from deep research and writing to building robust processes and automating complex workflows. We expect every new hire to bring a genuine curiosity for AI and a commitment to using it to work smarter, faster, and with greater creativity.
For some, this involves tinkering and remaining open to emerging tools; for others, it means architecting entirely new systems with AI at the core. We will be transparent about expectations for every role and provide the tools and support needed for you to thrive.<h2 class="jobSectionHeader">
About the Team</h2>
Our Product Delivery team is the engine that turns vision into impact. We ship early and often, getting valuable features into the hands of customers quickly and iterating from there. We work in the open by default, sharing progress and ideas, and we trust each other to own outcomes. We&rsquo;re a small but mighty crew where every person plays a critical role and we&rsquo;re committed to using AI to work smarter and faster.<h2 class="jobSectionHeader">
About the Role</h2>
We&rsquo;re looking for a Backend Engineer who has an appreciation for all things security and system interconnectivity. This is a very hands-on technical role where you will be responsible for designing, building and maintaining scalable integrations between our core applications, identity providers and data security platforms.<h2 class="jobSectionHeader">
What You'll Do</h2><ul><li>
Own deliveries and features from start to finish</li><li>
Design, build, and own backend services in a microservices-based, event-driven architecture</li><li>
Implement core domain logic that drives key product workflows and system behavior</li><li>
Ingest and process high-volume usage and event data from customer-facing endpoints</li><li>
Build backend services that support operational, analytics, and reporting use cases</li><li>
Model, persist, and manage domain data, enabling querying, filtering, and lifecycle management</li><li>
Expose well-designed APIs and webhooks consumed by customers, UIs, and external systems</li><li>
Power customer-facing UI experiences by providing backend APIs for visibility, analytics, and configuration</li></ul><h2 class="jobSectionHeader">
What You Bring</h2><ul><li>
3&ndash;5+ years of professional software engineering experience building backend services and distributed systems in the Java ecosystem (Java, Spring Boot, Maven/Gradle)</li><li>
Strong understanding of event-driven architectures, asynchronous processing patterns, messaging systems, and distributed system design</li><li>
Proven experience designing and maintaining RESTful APIs, web hooks, and service-to-service integrations</li><li>
Comfortable operating in AWS, GCP, or Azure environments and working with modern observability tooling, logging, and monitoring platforms</li><li>
A track record of delivering performant, reliable and scalable applications</li><li>
Excellent collaboration and communication skills in cross-functional teams</li></ul><h2 class="jobSectionHeader">
You Might Be a Fit if You</h2><ul><li>
Have experience building products in cybersecurity, identity, governance, compliance, data protection, or enterprise SaaS environments</li><li>
You understand not just how to build systems, but why architectural decisions matter</li><li>
You can balance scalability, reliability, maintainability, and speed of execution</li><li>
You think critically about security, observability, and operational excellence from day one</li><li>
Love the idea of blending software development, distributed systems and data-intensive applications</li><li>
Strong familiarity with authentication and identity technologies such as OAuth, OpenID Connect (OIDC), SAML, SCIM, Entra ID (Azure AD), Okta, or other enterprise identity providers</li><li>
Thrive in fast-paced startup environments where ambiguity is the norm</li><li>
Enjoy shaping culture and engineering practices, not just writing code</li><li>
Leverage AI tools as an engineer to help you build smarter, faster and better</li></ul><h2 class="jobSectionHeader">
Why Join Us</h2>
This isn't just a job - it's a chance to help define a category. Harmonic Security was named to the Rising in Cyber 2026 list, and we're just getting started. We're building at the intersection of AI and security, carving out an emerging market where the rules haven't been written yet, and the people who join now will write them.
We believe today's talent is tomorrow's success, and we're committed to creating an environment where you can do the best work of your life.<ul><li>
Recognized momentum - We made the Rising in Cyber 2026 list, a signal that the market is taking notice</li><li>
Rare market opportunity - Join early in a category-defining company at the convergence of AI and security, where your work directly shapes how enterprises tackle one of the biggest unsolved problems in tech</li><li>
Competitive pay and meaningful equity - A real stake in Harmonic's success, not a token gesture</li><li>
Comprehensive benefits - 401K, pension plan, generous PTO, and flexible hybrid work</li><li>
A small, high-trust team that values transparency, creativity, and continuous learning - no politics, no bureaucracy</li><li>
Thoughtful leadership - that cares deeply about your growth, not just your output</li><li>
Annual global off-sites - past trips include Lisbon, Portugal and Nashville, TN</li><li>
Real ownership - you'll shape the product, the culture, and the direction of the company from day one</li></ul><h2 class="jobSectionHeader">
Harmonic's Core Values</h2>
Flourish in the Unknown
We embrace new, unfamiliar situations that require initiative and rapid decision-making. We orient ourselves quickly and deliver results with minimal guidance.
Never Full
We raise our hands, take on challenges, and assist others whenever possible. We hunger for opportunities to learn and do more.
Perfect Harmony
We support one another to create cohesion and unity. We collaborate openly, share feedback honestly, and help everyone produce their best work
Compensation Range: &pound;89K - &pound;105K</div>

Senior Backend Engineer

Heidi

<div>
 
 Who is Heidi?
 
 
 
 Heidi is building an AI Care Partner that supports clinicians every step of the way, from documentation to delivery of care.
 
 
 We exist to double healthcare&rsquo;s capacity while keeping care deeply human. In 18 months, Heidi has returned more than 18 million hours to clinicians and supported over 73 million patient visits. Today, more than two million patient visits each week are powered by Heidi across 116 countries and over 110 languages.
 
 
 Founded by clinicians, Heidi brings together clinicians, engineers, designers, scientists, creatives, and mathematicians, working with a shared purpose: to strengthen the human connection at the heart of healthcare.
 
 
 Backed by nearly $100 million in total funding, Heidi is expanding across the USA, UK, Canada, and Europe, partnering with major health systems including the NHS, Beth Israel Lahey Health, MaineGeneral, and Monash Health, among others.
 
 
 We move quickly where it matters and stay grounded in what&rsquo;s proven, shaping healthcare&rsquo;s next era. Ready for the challenge?
 
 
 
 The Role
 
 
 
 A Senior Software Engineer responsible for the execution of the backend features, with a deep technical understanding and how it translates to representing user needs. You will have operated in a hyper growth startup with experience building SaaS products.
 
 
 You will also have a deep understanding of the key challenges engineers face and a firm grasp on design principles in prioritizing key features and capabilities.
 
 
 Your superpower is how to bridge the gap between technical specifics and business needs effortlessly and turn high-level designs into real-world solutions.
 
 
 You thrive in challenging situations, and you appreciate the dynamics of a flexible, flat-structured work environment. You are quick to grasp the nuances and complexities of developing an AI product healthcare internationally.
 
 
 We know that brilliant people can come from unlikely places; if you have a proven track record of shipping spectacular technically challenging products and features, regardless of industry, we want to meet you.
 
 
 
 What You'll Do
 
 
 
 Ultimately you will have the opportunity to work with the engineering mastermind behind Heidi developing AI products which will change the face of healthcare
 
 
 <ul>
 <li>
 Autonomously deliver beautiful &amp; robust code with considerations on code structure design and scalability.
 </li>
 <li>
 Implement and optimize data storage solutions.
 </li>
 <li>
 Design, build, and maintain high-performance backend systems using Python.
 </li>
 <li>
 Architect and manage cloud infrastructure, ensuring scalability and reliability.
 </li>
 <li>
 Develop and manage message queue systems for real-time data processing.
 </li>
 <li>
 Collaborate with frontend and AI teams to integrate new features and enhance existing APIs.
 </li>
 <li>
 Optimize API performance and handle API versioning, documentation, and testing.
 
 
 </li>
 </ul>
 
 What We&rsquo;ll Look For
 
 
 
 <ul>
 <li>
 Strong sense of ownership &amp; strong problem-solving skills.
 </li>
 <li>
 5+ years of backend development experience.
 </li>
 <li>
 Solid experience with MongoDB and Redis for data management.
 </li>
 <li>
 Experience building &amp; managing message queue systems at scale.
 </li>
 <li>
 Writing testable, effective and communicative code
 </li>
 <li>
 Data modeling, design patterns, understanding trade-offs
 </li>
 <li>
 Deep understanding of API design principles, including security, versioning, and performance.
 </li>
 <li>
 Data &amp; application security knowledge and skills
 </li>
 <li>
 Experience in integrating with third-party systems
 </li>
 <li>
 Competent with source code control and CI/CD pipeline technologies.
 </li>
 <li>
 Architecting and building highly available, scalable, secure &amp; performant systems
 
 
 </li>
 </ul>
 
 What do we believe in?
 
 
 
 Heidi builds for the future of healthcare, not just the next quarter, and our goals are ambitious because the world&rsquo;s health demands it. We believe in progress built through precision, pace, and ownership.
 
 
 <ul>
 <li>
 Live Forever - Every release moves care forward: measured, safe, and built to last. Data guides us, but patients define the truth that matters.
 </li>
 <li>
 Practice Ownership - Decisions follow logic and proof, not hierarchy. Exceptional care demands exceptional standards in our work, our thinking, and our character.
 </li>
 <li>
 Small Cuts Heal Faster - Stability earns trust, speed delivers impact. Progress is about learning fast without breaking what people depend on.
 </li>
 <li>
 Make others better - Feedback is direct, kindness is constant, and excellence lifts everyone. Our success is measured by collective growth, not individual output.
 
 
 </li>
 </ul>
 Our mission is clear: expand the world&rsquo;s capacity to care, and do it without losing the humanity that makes care worth delivering.
 
 
 
 Why you should Join Heidi 🚀
 
 
 
 <ul>
 <li>
 Real product momentum. We're not trying to generate interest, we're channeling it.
 </li>
 <li>
 Equity from day one. When Heidi wins, you win. You'll share directly in the success you help create.
 </li>
 <li>
 Unmatched impact. Play a pivotal role at a critical growth moment - working on a product that delivers tangible, real-world value to clinicians and patients every day.
 </li>
 <li>
 Work alongside world-class talent. Join a team of operators and builders who've scaled unicorns.
 </li>
 <li>
 Your health, covered. Comprehensive private medical and dental cover through Bupa, plus 24/7 mental health, coaching and wellbeing support through Sonder and a &pound;100/month Healthy Heidi&rsquo;s stipend.
 </li>
 <li>
 Global parental leave. 26 weeks paid for primary carers and 18 weeks for secondary carers, subject to eligibility.
 </li>
 <li>
 Fertility support. &pound;7,000 one-off payment, eligibility applies.
 </li>
 <li>
 Learning &amp; development. &pound;700 per year for courses, books, memberships, conferences and more.
 </li>
 <li>
 Home office budget. &pound;500 one-off to set up a workspace you actually want to work in.
 </li>
 <li>
 Recharge days after major milestones and busy periods so you can reset and come back strong.
 </li>
 <li>
 Work from anywhere for up to 4 weeks per year, wherever the world takes you.
 </li>
 <li>
 Clinical leave. 10 days per year for eligible clinical roles to maintain accreditation and requirements.
 </li>
 <li>
 Flexibility that works. A hybrid environment, with 3 days in the office.
 
 
 </li>
 </ul>
 
 Heidi&rsquo;s commitment to Diversity, Equity and Inclusion
 
 
 
 Heidi is dedicated to creating an equitable, inclusive, and supportive work environment that brings people together from diverse backgrounds, experiences, and perspectives. Our strength is in our differences. We're proud to be an equal opportunity employer and are proud to welcome all applicants as we're committed to promoting a culture of opportunity for all.
</div>

Senior Backend Engineer - UK

Tabeo

<div>Our mission is to become the financial and revenue operating system for primary care practices.
We help dental and veterinary clinics manage how money flows into the practice - from patient access, to payments, memberships, financing, insurance, and reporting - in one coherent system.
Rather than treating payments, plans, and finance as separate tools, we combine them into a single operating layer that reflects how practices actually run their business.
There are three structural shifts reshaping primary care right now:<ul><li>
Patient access is moving beyond opening hours. Clinics are under pressure to be available when patients want to engage, not just when the front desk is staffed. Voice and chat interfaces are becoming the new front door to care.</li><li>
Revenue is becoming structured, not ad-hoc. Memberships, financing, and insurance are increasingly used to smooth cashflow, improve access, and increase predictability &mdash; particularly as NHS capacity declines and private care expands.</li><li>
Practices need better financial insight, not more software. Owners and managers want to understand whether their pricing, plans, and utilisation make economic sense &mdash; without becoming analysts or relying on opaque tools.</li></ul>
Today, we support over 6,000 dental practices across the UK. 100 more join our platform every month. Tabeo is the dominant market leader for patient finance and seeks to reinvent memberships next. Beyond payments, we are launching a voice/chat AI solution that complements our existing products.
Tabeo is profitable. We seek to grow revenue by 50-60% per year and exceed &pound;25 million ARR in 2028.
We believe in a remote first approach to work and equip teams with perks and tools so they can thrive. However, we all come together 2x per year for our amazing &lsquo;Team Weeks&rsquo;. We previously met in Dubai, Lisbon, London and Athens. Next is a surprise!
About the role:
We&rsquo;re looking for an experienced backend engineer to join us! We currently have two cross-functional product teams. We&rsquo;re ambitious, and have many interesting strategic and technical challenges ahead of us, including:<ul><li>
Working towards our multi-product strategy as we scale our, Plans product</li><li>
Releasing our newest AI Revenue Engine product which is integrated across our product suite and provides multiple communication channels including voice, email, whatsapp and chat</li><li>
Expanding our target audience to include other primary healthcare providers (like vets and hearing specialists) and other regions/countries such as Germany.</li></ul>
Our legacy Finance system has supported us for 8 years and enabled us to reach &gt;10k dentists and create a sustainable, profitable business as we rapidly scale further. You should expect to play a key role in our engineering team:
We typically use the following tools and technologies:<ul><li>
Go to write our application code</li><li>
Google Cloud and AWS for infrastructure</li><li>
Confluent Kafka for our events handling</li><li>
Serverless technologies in AWS e.g. API GW, Lambda, EventBridge, DynamoDB, Docker for our new infrastructure</li><li>
Postgres for our databases</li><li>
Our frontend uses Javascript and TypeScript and is hosted on Vercel</li></ul>
Our interview process includes:
You&rsquo;ll start by having an initial call with our recruiter. From there, the process has three main stages:<ul><li>
A take home task (should take no more than 2 hours) or provide a sample from a public github we can discuss</li><li>
A technical interview with our engineering team</li><li>
A behavioural interview with our product team</li></ul>
As part of the process, we also ask candidates to complete a short critical thinking assessment in their own time. We use this as a benchmark alongside the interviews. It should take no longer than 40 minutes to complete.
If we extend you an offer, we&rsquo;ll also arrange for you to meet Paul, our CEO, where you can ask any outstanding questions you have about Tabeo. 
Requirements:<ul><li>
You have strong experience working on a Go backend of a technology product, particularly if you&rsquo;ve worked with Go or in fintech before</li><li>
You&rsquo;re comfortable working with a DevOps mentality of &ldquo;you build it, you run it&rdquo;</li><li>
You have a product mindset: you care about customer outcomes and you want to make data-informed decisions</li><li>
You&rsquo;re comfortable leading on projects that are large in scope, ambiguous, or not well defined</li><li>
You&rsquo;re the kind of person that cares about their team, and works to continuously improve culture, processes and communication.</li></ul> 
Benefits 
Competitive salary
Remote-first working
&pound;2,000 annual training and development budget
Fully equipped home-office setup
AXA Business Health private medical cover (UK), including dental, optical, life assurance, wellbeing support and gym discounts
Electric car scheme
24 days&rsquo; annual leave plus birthday off
Enhanced parental leave
Fertility treatment leave (up to 5 days per year)
Contributing pension scheme (UK)
Company trips, offsites, and team get-togethers we actually look forward to! 
We seek a fully remote candidate from the UK or anywhere GMT +/- 3</div>

Senior Backend Engineer (Golang)

Octopus Energy

<div>Octopus Energy started with a bold idea: to build Britain&rsquo;s first truly digital energy supplier. By combining world-class tech with brilliant humans who care deeply about customers and driving the renewable energy transition, we made it happen and in 2025, we became Britain&rsquo;s largest energy supplier.
 
 
Now, we&rsquo;re scaling our services business, making it easy to switch to heat pumps, solar and EVs, and launching smart tariffs for Low Carbon Tech. 
 
With this, we&rsquo;re also taking the learnings, products and experiences that customers love here and rolling them out worldwide. 
 
OE Tech is the engineering and product organisation inside Octopus Energy. Here you&rsquo;ll have real ownership, variety, and the chance to shape products that make a tangible difference in people&rsquo;s lives: lowering bills, enabling greener living, and delivering experiences customers genuinely love. You&rsquo;ll work side by side with teams across services, marketing, operations, and data, and see the impact of your work in the real world, fast. 
 
We are looking for a Senior Backend Engineer to join our Low Carbon Tech team. 
 
We are installing EV Chargers, Solar, Batteries and Heat Pumps into homes to drive the energy transition at pace. As customer demand grows, our goal is to ensure scaling up never means slowing down or compromising on a world-class customer journey for low carbon tech.
 
 
To make that happen, we are building a new, dedicated engineering and product team to completely re-imagine this process - making it fast, transparent, and predictable for our customers from day one. This will be a small multi-disciplinary team who&rsquo;ll sit within our much bigger low carbon tech team.
 
 
You&rsquo;ll help design and build the platform architecture, data integrations, and automations that eliminate real world friction. If you want to design and build solutions to scale up electrotech in the nation&rsquo;s homes, this is the mission for you.
 
 
We embrace flat hierarchies and an open, agile culture that fosters innovation, flexibility, and creativity. We don&rsquo;t hang our personalities up with our coats and nor should you.
 
 
At Octopus, we hire great people who get stuff done, all whilst being themselves.
<h3 class="jobSectionHeader">
What you'll do...</h3><ul>
<li>Take total technical ownership of key platform components, shaping direction and bringing clarity to ambiguous problems while ensuring solutions are well-designed, scalable, and maintainable.</li>
<li>
Consistently write production-ready, self-documenting code that requires minimal revision, and actively improve testing strategies, non-functional requirements (performance, security, scale), and test infrastructure.
</li>
<li>Tackle systemic bottlenecks and architectural risks across multi-service configurations before they hit production, utilising highly systematic debugging approaches.
</li>
<li>Mentor other engineers, lead technical discussions, and perform rigorous code reviews to leave our systems, practices, and people stronger than you found them. Your influence will go far beyond your own delivery to help make Octopus an incredible place to be an engineer.
</li>
</ul><h3 class="jobSectionHeader">What you'll need...</h3>
5+ years experience of robust backend development with deep expertise in systems design, database optimisation (PostgreSQL/MySQL), and cloud execution. 
<ul><li>
</li>
Excited by the possibilities of integrating AI tools into your workflow to iterate quickly, combined with the discipline to rigorously check and ensure code quality. 
<li>
</li>
Clear communication skills, with a proven ability to translate complex technical constraints and architectural risks cleanly to non-technical stakeholders (compliance, operations, business development). 
<li>
</li>
<li>A genuine curiosity about the green technology landscape. You won't be expected to dive into physical engineering or device-level software, so you don't need to be a hardware expert, we&rsquo;re just looking for someone who shares our passion for getting clean energy into millions of homes.</li>
</ul><h3 class="jobSectionHeader">Our Tech Stack...
</h3><div><ul><li>Python, Django
</li>
<li>PostgreSQL, Celery, and asynchronous background processing
</li>
<li>API Architectures HTTP, REST APIs, GraphQL
</li>
<li>Domain modeling, writing fault-tolerant systems, and test-driven deployment (TDD)
</li>
<li>AWS, Terraform, Packer, Consul, microservices, and distributed architecture scaling
</li>
</ul></div><h3 class="jobSectionHeader">\uD83D\uDC9AWhy else you'll love it here...</h3><div>
<ul><li>\uD83D\uDCB0 Wondering what the salary for this role is? Just ask us! On a call with one of our recruiters it's something we always cover as we genuinely want to match your experience with the correct salary. The reason why we don't advertise is because we honestly have a degree of flexibility and would never want salary to be a reason why someone doesn't apply to Octopus - what's more important to us is finding the right octofit!</li>
<li>\uD83C\uDF89 Octopus Energy Group is a unique culture. An organisation where people learn, decide, and build quicker. Where people work with autonomy, alongside a wide range of amazing co-owners, on projects that break new ground. We want your hard work to be rewarded with perks you actually care about! We won best company to work for in 2022, on Glassdoor we were voted 50 best places to work in 2022 and our Group CEO, Greg has recorded a podcast about our culture and how we empower our people. We&rsquo;ve also been placed in the top 10 companies for senior leadership</li>
<li>\uD83C\uDF81 Visit our UK perks hub - Octopus Employee Benefits</li>
</ul></div><div>We would prefer someone who can work in our London office but will consider remote candidates. However, you do need to be able to work in the UK.
</div>
<div></div><div>Our process usually takes up to 4 weeks, but we&rsquo;ll always do our best to flex around what works for you. Along the way, you&rsquo;ll chat with our recruitment team and your Recruiter will help you throughout different stages. Got any burning questions before then? Drop us a message at talent@octoenergy.com and we&rsquo;d love to help!</div>
<div></div>
<div>If this sounds like you then we'd love to hear from you.</div>
<div></div>
<div>Are you ready for a career with us? We want to ensure you have all the tools and environment you need to unleash your potential. Need any specific accommodations? Whether you require specific accommodations or have a unique preference, let us know, and we'll do what we can to customise your interview process for comfort and maximum magic!</div>
<div></div>
<div>Studies have shown that some groups of people, like women, are less likely to apply to a role unless they meet 100% of the job requirements. Whoever you are, if you like one of our jobs, we encourage you to apply as you might just be the candidate we hire. Across Octopus, we're looking for genuinely decent people who are honest and empathetic. Our people are our strongest asset and the unique skills and perspectives people bring to the team are the driving force of our success. As an equal opportunity employer, we do not discriminate on the basis of any protected attribute. Our commitment is to provide equal opportunities, an inclusive work environment, and fairness for everyone.</div>

Where necessary, we sometimes use AI tools to help with parts of our hiring process, like reviewing applications or assessing responses. We&rsquo;re lucky to receive a huge amount of interest, so these tools help our recruiters manage that volume, not replace them. Ultimately, every hiring decision (for example, whether to progress your application or not) is always made by a real person in our Talent team. If you&rsquo;d like to know more about how we use your data, you can reach out to us via email at talent@octoenergy.com. We&rsquo;re happy to help!</div>

Senior Backend Engineer - Low Carbon Tech (LCT)

Burns Sheehan

<div>
 
 
 Senior Backend Engineer &ndash; Fintech - Python
 
 
 
 
 
 
 
 📍 London (Hybrid, 3 days per week)
 
 
 
 
 
 
 
 💵 &pound;80,000 &ndash; &pound;90,000 + 10-20% Bonus
 
 
 
 
 
 
 
 💻 Python, Django, Flask, Pandas, APIs, Airflow, Data Processing
 
 
 
 
 
 
 
 📈 Growing Private Credit technology platform
 
 
 
 
 
 
 
 ⚙️ Backend ownership, platform engineering and data-adjacent challenges
 
 
 
 
 
 
 
 
 
 We're partnered with a specialist technology business operating within the Private Credit and Asset Finance space. Following multiple new client wins and a significant increase in platform demand, they're expanding their engineering team with the hire of a Senior Backend Engineer.
 
 
 
 
 
 This is a genuine ownership role within a small, highly capable engineering team. Engineers are responsible for features and components from design through to delivery, working closely with technical leadership and domain experts to shape the future of the platform.
 
 
 
 
 
 The business has built a sophisticated software platform used to manage and monitor complex financial workflows. As new projects continue to onboard, they're looking for an experienced Python engineer to help scale backend services, APIs and data-processing capabilities across the platform.
 
 
 
 
 
 One of the more interesting aspects of the opportunity is the level of influence available. There is no traditional product management layer, meaning engineers have direct input into technical decisions, ownership of meaningful components and the opportunity to shape how the platform evolves.
 
 
 
 
 
 
 Ideal profile:
 
 
 
 &bull; 5+ years' commercial software engineering experience
 
 
 &bull; Strong Python backend development experience
 
 
 &bull; Commercial experience with Django, Flask or similar frameworks
 
 
 &bull; Experience building APIs and backend services in production environments
 
 
 &bull; Comfortable working with data-processing workflows, ETL pipelines or DataFrame-style tooling
 
 
 
 
 
 
 
 
 
 Senior Backend Engineer &ndash; Fintech - Python
 
 
</div>

Senior Software Engineer

Zapp

<div>Principal Software Engineer, Backend
Nine Elms, London. Full time (4 Days Onsite)
You'll need the right to work in the UK and be based in London. We are not able to offer visa sponsorship for this role.
About Zapp
We deliver the essentials in minutes, 24/7, from our own network of stores. Every order is a real-time race against the clock, and the systems that win it are the backend you would own.
Quick commerce is a genuinely hard backend problem. Stock changes by the second, orders and riders move in real time, and we make sub-minute promises we have to keep, at high throughput with no room for downtime. Getting that right, fast and reliably, is the job.
We're AI-first and we mean it as a way of working, not a slogan: AI-assisted development is part of the daily toolkit, we ship LLM-powered features where they genuinely earn their place, and we expect every engineer to shape how we use it.
Backed by the world's leading investors, built by people who've scaled Amazon, Deliveroo, Tesco, Just Eat and Stuart.
Our Leadership Principles
These five principles describe what great looks like at Zapp. They are the single framework we use across performance reviews, growth conversations, and leadership expectations.<ul><li>
Creating Magic</li><li>
Taking Ownership</li><li>
Raising the Bar</li><li>
Winning Together</li><li>
Delivering with Speed</li></ul>
The role
You'll be the most senior backend engineer at Zapp, owning the technical direction of the services that run the business, from ordering and inventory to logistics and the platform underneath. This is a hands-on Principal role: you set the architecture and the standard, and you're still in the code every week shipping the hardest parts yourself.
You'll work across the whole backend rather than one corner of it, going where the hardest problem is. You'll take ownership from a rough problem all the way to production and on-call, and you'll lift the engineers around you while you do it. When the team needs a pattern set, a hard call made, or the gnarly bit untangled, that's you.
What you'll do<ul><li>
Set the technical direction. Own the architecture of the backend across services, and make the calls on patterns, boundaries and tooling that the rest of the team builds on.</li><li>
Build the hard parts yourself. Design and ship the services, APIs and data models behind ordering, inventory and logistics, and set the standard for what good looks like.</li><li>
Raise the bar. Lift the engineers around you through design review, pairing, and the standard you set, and leave the team stronger than you found it.</li><li>
Own reliability and scale. Keep high-throughput, real-time systems fast and available, and design for the failure modes that come with sub-minute delivery.</li><li>
Own delivery end-to-end. Pick up a problem, design the solution, ship it to production, and be on the on-call rotation that stands behind it.</li><li>
Bring AI into how we build. Use AI in your daily work, share the patterns that help the team move faster, and learn from what others discover.</li><li>
Help shape AI in our product. Build the backend behind LLM-powered features, from the data and APIs to the guardrails that keep them safe in production.</li><li>
Work across the boundary. Partner with mobile, data and ops engineers on the contracts and systems that tie the product together.</li></ul>
You're a great fit if you<ul><li>
Experienced. 7+ years building backend systems in production, with real scale behind you.</li><li>
Strong in TypeScript. It's core to our backend and you're genuinely fluent, not just passing through.</li><li>
Polyglot. You've shipped production code in more than one language and reach for the right tool for the job.</li><li>
Distributed systems depth. You design services, APIs and data models that hold up under real-time, high-throughput load.</li><li>
Own the data layer. Confident with relational and non-relational stores, and clear on the trade-offs between them.</li><li>
Lead without a title. You set technical direction and bring people with you through clarity and example, not authority.</li><li>
Production minded. Reliability, observability, performance and security are things you design in from the start, not bolt on after the incident.</li><li>
Comfortable in uncertainty. You move forward when the path isn't clear, instead of waiting for someone to define it.</li><li>
Test as you build. Automated tests are how you ship code you trust.</li><li>
Pragmatic about delivery. You measure your work by what shipped and held up, not the elegance of the design doc.</li><li>
Excellent communicator. Clear in how you write and speak, and you love sharing what you learn.</li></ul>
If most of these land for you, please apply. We hire on trajectory and curiosity as much as CV.
Even better if you know<ul><li>
GCP. We run on Google Cloud, with Cloud Run, Pub/Sub and Firestore, so familiarity helps you hit the ground running.</li><li>
NestJS. Our TypeScript services are built on it.</li><li>
GraphQL. We run a federated gateway across multiple subgraphs, so federation experience makes schema and subgraph work easier.</li><li>
Event-driven architecture. Queues, streams and async messaging at scale.</li><li>
Infrastructure as code and DevOps. You're comfortable owning the path to production, not just the code.</li><li>
Quick commerce or similar domain. Logistics, on-demand delivery, or another real-time, high-throughput consumer environment.</li></ul>
You won't be a great fit if you<ul><li>
Need a fully defined process and a large, structured team to do your best work.</li><li>
Chase architectural purity at the expense of what the business actually needs.</li><li>
Stall when the path forward isn't clear, or wait to be told what to do.</li><li>
Want to stay strictly inside one service or specialty and avoid the rest of the stack.</li></ul>
What's the interview process like?
We aim to make our process clear, respectful of your time, and a real two-way conversation.<ul><li>
Stage 1 - Intro call (30 min). A short chat about your background and a chance for us to tell you more about Zapp, the team, and the role.</li><li>
Stage 2 - Technical interview (90 min). Live coding and a system design discussion. You'll have full access to any AI tooling you'd normally use, and we'll send you a boilerplate repository in advance so you can focus on the problem, not the setup.</li><li>
Stage 3 - Values &amp; Leadership interview (60 min). A conversation with senior leadership about how you work, what you care about, and how you align with our Leadership Principles.</li><li>
Stage 4 - Offer.</li></ul>
We will need to verify your right to work in the UK before extending an offer.
Benefits<ul><li>
Generous salary &amp; equity package</li><li>
25 days holiday per year, plus all bank holidays</li><li>
Private health insurance</li><li>
Extended sick pay and enhanced maternity and paternity leave</li><li>
Cycle to work scheme</li><li>
Pension (auto-enrolment)</li><li>
Budget for learning, conferences and kit</li></ul></div>

Principal Software Engineer, Backend

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