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senior software engineer backend berlin

Cresta

<div>
 Cresta unlocks the true potential of the customer experience, turning every conversation into a competitive advantage. Cresta&rsquo;s unified AI platform combines conversational AI agents, real-time human agent augmentation, and comprehensive conversation intelligence to drive revenue and efficiency gains across every channel. The world&rsquo;s leading companies, including United Airlines, Cox Communications, and Marriott, use Cresta to power world-class customer experiences every day.
 
 
 Born from the Stanford AI Lab, Cresta has raised more than $270 million from the world&rsquo;s leading investors, including a16z, Greylock, and Sequoia. Cresta&rsquo;s leadership includes some of the leading minds in AI today. Our CEO, Ping Wu, founded and led Google's Contact Center AI and Vertex AI platforms before joining Cresta to build the future of AI-driven customer experiences.
 
 
 Over the next few years, AI is going to redefine how people all over the world interact with businesses every day. Come build that future at Cresta.
 
 
 
 About The Role
 
 
 
 As a Senior full-stack engineer, with a backend focus, you will be at the forefront of shaping the future of customer engagement! As we work towards our vision, you'll be instrumental in delivering timely, actionable insights that drive business growth from day one. We're building a state-of-the-art Customer Data Platform, visualizing relevant insights for businesses post-onboarding and guiding customer engagement across all touch-points. Be part of the team that's redefining the way businesses connect with their customers!
 
 
 
 Responsibilities
 
 
 
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 Design, implement, and maintain backend services and APIs to support applications.
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 Build and optimize data storage solutions using Postgres, ClickHouse and Elasticsearch to ensure high performance and scalability.
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 Collaborate with cross-functional teams, including frontend engineers, data scientists, and machine learning engineers, to deliver end-to-end solutions.
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 Monitor and troubleshoot performance issues in distributed systems and databases.
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 Write clean, maintainable, and efficient code following best practices for backend development.
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 Participate in code reviews, testing, and continuous integration efforts.
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 Ensure security, scalability, and reliability of backend services.
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 Analyze and improve system architecture, focusing on performance bottlenecks, scaling, and security.
 
 
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 Qualifications We Value
 
 
 
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 Proven experience as a Backend Engineer with a focus on database design and system architecture.
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 Strong expertise in ClickHouse or similar columnar databases for managing large-scale, real-time analytical queries.
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 Hands-on experience with Elasticsearch for indexing and searching large datasets.
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 Proficient in backend programming languages such as Python, Go.
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 Experience with RESTful API design and development.
 </li>
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 Solid understanding of distributed systems, microservices architecture, and cloud infrastructure.
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 Experience with performance tuning, data modeling, and query optimization.
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 Strong problem-solving skills and attention to detail.
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 Excellent communication and teamwork abilities.
 
 
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 </ul>
 
 Perks &amp; Benefits
 
 
 
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 Paid parental leave to support you and your family
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 Monthly Health &amp; Wellness allowance
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 Work from home office stipend to help you succeed in a remote environment
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 Lunch reimbursement for in-office employees
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 PTO: 28 days in Germany
 
 
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 Compensation for this position includes a base salary, equity, and a variety of benefits. Actual base salaries will be based on candidate-specific factors, including experience, skillset, and location, and local minimum pay requirements as applicable. Your recruiter can provide further details.
 
 
 We have noticed a rise in recruiting impersonations across the industry, where scammers attempt to access candidates' personal and financial information through fake interviews and offers. All Cresta recruiting email communications will always come from the @cresta.ai domain. Any outreach claiming to be from Cresta via other sources should be ignored. If you are uncertain whether you have been contacted by an official Cresta employee, reach out to recruiting@cresta.ai
</div>

Senior Software Engineer, Backend (Berlin)

Chapter 2

<div>Senior Product Engineer &ndash; Digital Health / AI Berlin (on-site) &middot; Full-time
Chapter 2 is partnering exclusively with a leading digital health startup at the forefront of AI-enabled cardiac telemonitoring. Working with institutions including Charit&eacute;, Mayo Clinic, and UCSF, they are building technology that detects early signs of heart failure deterioration and improves patient outcomes at scale.
They are looking for a Senior Product Engineer to join a small, high-ownership team and take end-to-end responsibility for significant product projects across their AI-enabled platform.
The Role
You will work closely with the Product Lead to scope, build, and ship substantial features across the full stack, from physician and patient interfaces on the frontend to APIs, data modelling, and ML integration on the backend. You won't be handed tickets. You'll shape projects from concept through to post-launch iteration, lead a small squad of engineers, and collaborate directly with clinical partners, sales, and founders.
What You'll Need<ul><li>
M.Sc. in a STEM field with 2+ years of full-stack experience, or 4+ years without</li><li>
Strong Python on the backend, TypeScript/React on the frontend</li><li>
A product and user-focused mindset &mdash; you care about UX and make design decisions, not just implementation decisions</li><li>
Comfort operating with high autonomy in a small team</li><li>
Fluent English</li></ul>
Nice to Have<ul><li>
Experience with ML/data pipelines, audio/signal processing, or clinical data</li><li>
Background in regulated software (MDR, ISO 13485, IEC 62304) or healthcare products</li><li>
DevOps and cloud infrastructure experience (GCP, CI/CD)</li><li>
German language skills</li></ul>
What's on Offer<ul><li>
Competitive compensation package with meaningful equity</li><li>
A mission that matters &mdash; technology with direct impact on patient outcomes</li><li>
A Berlin-Mitte office and a team built from some of the best engineering and clinical minds in digital health</li><li>
Urban Sports Club membership</li></ul>
If you are a full-stack engineer who wants to own real product work in a clinical environment that is genuinely changing how heart disease is managed, we'd like to hear from you.</div>

Senior Product Engineer

develop

<div>
 
 
 Software Engineer | Java, AWS | Berlin | &euro;70k - &euro;85k | German B2+
 
 
 
 
 
 
 We're looking for a talented Software Engineer with a strong background in Java and AWS to join a fast growing team in Berlin.
 
 
 
 
 
 In this role, you'll develop and maintain scalable backend applications, contribute to the design of new features, and work closely with product managers, QA, and fellow engineers to deliver high-quality software. We're looking for someone who enjoys solving technical challenges, writing clean, maintainable code, and collaborating in an agile environment.
 
 
 
 
 
 
 Responsibilities:
 
 
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 Design, develop, and maintain high-quality Java applications and backend services
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 Build and enhance RESTful APIs and integrate with internal and external systems
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 Collaborate with cross-functional teams to deliver new features from concept through to production
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 Write clean, maintainable, and well-tested code following engineering best practices
 </li>
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 Participate in code reviews and contribute to technical discussions and architectural decisions
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 Troubleshoot, debug, and optimise applications to ensure performance and reliability
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 Support continuous improvement of development processes and engineering standards
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 </ul>
 
 
 
 
 
 Requirements:
 
 
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 Strong commercial experience developing applications with Java
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 Experience building RESTful APIs and backend services
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 Strong cloud experience with AWS
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 Familiarity with relational databases and modern software development practices
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 Experience working in Agile/Scrum teams
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 German language skills at B2 level or above (required)
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 Strong communication skills and a collaborative mindset
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 </ul>
 
 
 
 
 If you're interested please get in touch ASAP!
 
 
 
 
</div>

Senior Software Engineer

NextexAI

<div>NexTex AI is a Berlin-based deep-tech startup building an AI-powered intelligence layer for textile manufacturing.

Our platform combines industrial cameras, retrofit sensors, PLC/SCADA signals, edge computing and artificial intelligence to detect textile defects, optimize production processes and generate sustainability KPIs for CSRD and EU Green Deal compliance.

We are currently preparing our EXIST Startup Grant application and a ProFIT Berlin R&amp;D funding application. Our goal is to build and validate an MVP with pilot textile manufacturers during the first year and scale into one of Europe's leading industrial AI platforms for textile production.

We are looking for a Founding Software Engineer who wants to join the founding team and help build the technical backbone of the company from day one.
<h2 class="jobSectionHeader">
Tasks</h2>

As a Founding Software Engineer, you will be responsible for designing and building the backend systems, cloud infrastructure and AI deployment architecture behind NexTex AI.

You will work closely with the founders, machine learning engineers and future computer vision engineers to create a scalable edge-to-cloud platform for industrial AI applications.

Your responsibilities include:
<ul><li>Building cloud-native infrastructure and deployment pipelines</li></ul>
<ul><li>Designing and developing scalable backend services and APIs</li></ul>
<ul><li>Building dashboards, analytics systems and internal tools</li></ul>
<ul><li>Developing industrial data pipelines for machine, sensor and camera data</li></ul>
<ul><li>Supporting edge-to-cloud communication and industrial integrations</li></ul>
<ul><li>Supporting AI model deployment, monitoring and inference workflows</li></ul>
<ul><li>Structuring textile production data, defect classifications and sustainability KPIs</li></ul>
<ul><li>Working directly with pilot factories and industrial partners</li></ul>
<ul><li>Contributing to product architecture and technical strategy</li></ul>
<h2 class="jobSectionHeader">
Requirements</h2>

Strong software engineering background
<ul><li>Strong Python and C++ programming skills</li></ul>
<ul><li>Experience with FastAPI, Django, Flask, Node.js or similar frameworks</li></ul>
<ul><li>Experience with PostgreSQL or similar database systems</li></ul>
<ul><li>Experience with Docker and containerized environments</li></ul>
<ul><li>Experience with AWS, Azure or Google Cloud</li></ul>
<ul><li>Understanding of REST APIs and scalable software architectures</li></ul>
<ul><li>Fluent English</li></ul>
<ul><li>Ability to work independently in an early-stage startup environment</li></ul>

Preferred Qualifications
<ul><li>Located in Berlin or willing to relocate to Berlin</li></ul>
<ul><li>Professional working proficiency in German (prior work experience in a German-speaking environment preferred)</li></ul>
<ul><li>Experience with Computer Vision and Machine Learning systems (using frameworks such as PyTorch, TensorFlow or ONNX)</li></ul>
<ul><li>Experience with MLOps and model deployment pipelines</li></ul>
<ul><li>Experience with Edge AI deployments (NVIDIA Jetson, CUDA or TensorRT)</li></ul>
<ul><li>Experience with Industrial IoT, PLC/SCADA systems or manufacturing environments</li></ul>
<ul><li>Startup or founding-team experience</li></ul>
<ul><li>Interest in textile manufacturing, sustainability and Industry 4.0</li></ul>
<h2 class="jobSectionHeader">
Benefits</h2>
<ul><li>10% equity participation as a founding team member</li></ul>
<ul><li>Approx. &euro;2,500/month through the German Federal EXIST Startup Grant during the first year</li></ul>
<ul><li>Significant compensation increase planned following successful MVP validation and funding milestones</li></ul>
<ul><li>Opportunity to build a deep-tech startup from day one</li></ul>
<ul><li>Direct impact on product, technology and company strategy</li></ul>
<ul><li>Access to real industrial production environments and pilot textile factories</li></ul>
<ul><li>Work on AI, Computer Vision, Edge AI, Industrial IoT and Sustainability Intelligence</li></ul>
<ul><li>Direct collaboration with experienced founders, academic advisors and industry partners</li></ul>
<ul><li>Startup coaching, legal support and mentoring through EXIST and ProFIT Berlin</li></ul>
<ul><li>Opportunity to shape both the product and company from an early stage</li></ul>
<ul><li>Flexible working environment</li></ul>
<ul><li>Potential CTO-level growth opportunities as the company scales</li></ul>

We are looking for ambitious engineers who want to build something meaningful from the ground up. If you are excited about AI, industrial systems, sustainability and entrepreneurship, we would love to hear from you.

To apply, please submit:
<ul><li>Your CV</li></ul>
<ul><li>LinkedIn profile</li></ul>
<ul><li>A short introduction explaining why you are interested in joining NexTex AI</li></ul>

Selected candidates will be invited to:

1. Introductory discussion with the founders

2. Technical discussion and architecture review

3. Final founder meeting

If successful, you will join NexTex AI as a founding team member with 10% equity and play a key role in building the future of industrial AI for textile manufacturing.

We look forward to hearing from you.</div>

Founding Software Engineer (Backend, Cloud & AI Infrastructure)

THRYVE

<div>
 
 
 Product Engineer (Full Stack/AI) Berlin | On-site/Hybrid
 
 
 
 
 
 
 We're partnering with an ambitious health-tech startup building AI-powered software that helps clinicians make better decisions and improve patient outcomes, working on one of the hardest and most meaningful challenges in healthcare: turning complex clinical data into products that help medical teams identify risk earlier, intervene faster, and ultimately improve lives.
 
 
 
 
 
 We're looking for a strong engineer who wants to own products, not tickets.
 
 
 
 
 
 You'll work across backend, frontend, AI integrations, and product strategy, taking features from idea to production. You'll collaborate directly with founders, designers, clinicians, and engineers to solve complex technical problems and ship software that genuinely matters.
 
 
 
 
 
 
 What You'll Work On
 
 
 <ul>
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 Building production-grade AI features and workflows
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 Designing scalable backend systems and APIs in Python
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 Developing modern React/TypeScript applications
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 Integrating machine learning models into real-world products
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 Working with complex, high-value healthcare data
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 Improving reliability, observability, testing, and engineering quality across the platform
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 </ul>
 
 
 
 
 
 We're Looking For
 
 
 <ul>
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 Strong software engineering fundamentals
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 Professional experience with Python and React/TypeScript
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 Product-minded engineers who enjoy understanding user problems
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 Builders who take ownership and thrive in small, high-performing teams
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 Engineers excited by AI-enabled products and difficult technical challenges
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 M.Sc. in a STEM field
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 </ul>
 
 
 
 
 
 Nice To Have
 
 
 <ul>
 <li>
 Experience with AI/ML systems
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 Cloud infrastructure and DevOps experience
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 <li>
 Exposure to healthcare, regulated software, or data-intensive products
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 </ul>
 
 
 
 
 
 Why Join?
 
 
 <ul>
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 Build technology with real-world impact
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 Work directly with exceptional founders and engineers
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 Own major product initiatives end-to-end
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 Solve technically challenging problems at the intersection of software, AI, and healthcare
 </li>
 </ul>
 
 
 
 
 If you're the kind of engineer who enjoys moving quickly, taking ownership, and building products from the ground up, we'd love to hear from you.
 
</div>

Full Stack Engineer

idealo internet

<div>As a Senior Android Engineer at idealo, you drive the evolution of our award-winning e-commerce apps. We enable millions of users to do price comparison and good buying decisions on their mobile phone. We are a fully integrated and autonomous team that balances using proven technologies with cutting edge experimentation, delivering best in class user experiences and impact on idealo&rsquo;s mission. We own our code and decide on the technical direction of our products. And we need strong support to grow further.<h3 class="jobSectionHeader">
About your new role</h3><ul><li>
At idealo you are part of a team of highly motivated Android developers that strive for excellence in product and software development.</li><li>
You work closely with product owners, user experience designers, data analysts and an engineering team for our backend for frontend (BFF).</li><li>
We work as an agile team where you will be involved in product development from ideation to operating a product at scale.</li><li>
You&rsquo;re routinely working with modern technologies and practices on a high quality Kotlin codebase, allowing us to innovate fast and efficiently.</li><li>
A refined user interface is important to you, and you work closely with your UX colleagues to make features even better during implementation.</li><li>
You apply pragmatic solutions, find the right trade-offs, and seek to reduce complexity to help your team to deliver and increase leverage for the organisation.</li></ul><h3 class="jobSectionHeader"> 
Skills &amp; Requirements</h3><ul><li>
You have a deep understanding of Android development and extensive experience working with Kotlin and Kotlin coroutines.</li><li>
Experience with concepts like MVVM, Clean Code and SOLID is a must, and you know how to apply software design and architecture patterns.</li><li>
Ideally, you are experienced with implementing GraphQL APIs.</li><li>
You are passionate about writing readable, reliable, maintainable, and testable code.</li><li>
You are an open and communicative team player, curious about solving interesting and sometimes complex problems.</li><li>
You are a self-sufficient and well organised engineer, and you can expect the same from the team around you.</li></ul><h3 class="jobSectionHeader">
At idealo you can expect</h3><ul><li>
You want to further your education? We take your personal development goals seriously and, in addition to our idealo Learning Hub, eLearning offerings (e.g., Udemy), coaching &amp; mediation, we also offer you the opportunity to benefit individually from additional learning and development budget.</li><li>
And what about the office? Our office in the heart of Berlin offers free organic breakfast, excellent free lunch (vegan and vegetarian), as well as free coffee, lemonades and after-work beer, in addition to the &quot;standard foosball&quot;. It also has a fabulous rooftop terrace with view of the whole of berlin where you can network with colleagues from our group of companies.</li><li>
In need of additional support in any areas of your life? We offer free counseling and support in all areas of life (professional, private, family, health, etc.) in cooperation with the pme-Familienservice.</li><li>
You want full flexibility on your way to work and beyond? No problem with a job bike or Deutschlandticket - and it's environmentally friendly, too!</li><li>
Want to keep yourself fit? We offer many different fitness and sports options, such as an Urban Sports or Gympass membership, to suit your personal needs.</li><li>
And what else is there? Of course, success must be celebrated! In addition to team events, you can also expect big company events and other moments of organized connection with others in the company and your team throughout the year!</li></ul>
#LI-AJ1</div>

Senior Android Engineer - Kotlin (m|w|d)

LiveEO GmbH

<div><h4 class="jobSectionHeader">Build the Market Leader in Satellite Analytics with us at LiveEO</h4>
You will work on applications that use deep learning and satellite data to help companies and governments fight deforestation, monitor critical infrastructure, and respond faster and more precisely to natural disasters. Our aim is to empower any user in the world to harness the power of earth observation satellites to simplify and improve their daily work. 
 
As a full-stack engineer on our product team you will own large topics end-to-end &mdash; from early design through production. Concretely, that means handling large volumes of geospatial information efficiently in both browser and backend, solving graph problems in the database with carefully crafted queries, and building robust integrations with the growing number of third-party consumers of our services. You will refactor existing systems where needed and build greenfield applications where the problem demands it. 
 
How we work 
Our development lifecycle is a pragmatic scrumban: structured enough to coordinate, loose enough to move fast. Engineers here are highly autonomous. You will own topics from early exploration through delivery, act like a product engineer with deep domain knowledge, and make decisions yourself or in small circles without needing sign-off chains. 
 
We take agentic development seriously, but are aware of its limits. Tickets with solid acceptance criteria become agentic specs that agents implement in test-driven setups. Code review is a mix of agent and human - whichever is most effective for the change at hand. We ship to production at least weekly. And yes, we actively encourage engineers to keep coding and debugging manually to stay sharp; the goal is augmented engineers, not engineers who've forgotten how to program<h4 class="jobSectionHeader"> 
Your challenge</h4><ul><li>
Build and extend features end-to-end handling large volumes of geospatial data with great UX and design</li><li>
Construct well-designed and performant APIs and backend services for 3rd-party partners and customers</li><li>
Work in cross-functional teams on large topics from very early on. Understand the domain and own features from initial idea to continuous monitoring and incident response 
 
Our Stack 
Frontend: React, TypeScript 
Backend: NestJS, TypeORM, Python 
Database: PostgreSQL (including geospatial workloads) 
Infrastructure &amp; CI/CD: Gitlab</li></ul><h4 class="jobSectionHeader">
Your profile</h4>
Must have: 
<ul><li>
Strong TypeScript and React (VueJS or Preact also fine)</li><li>
Backend experience with NestJS, Express, or Node.js</li><li>
Experience with CI/CD and modern software architecture practices</li><li>
Hands-on familiarity with agentic coding setups - you've used AI-assisted workflows in your actual day-to-day, not just experimented</li></ul>
Nice to have: 
<ul><li>
Experience with spec-driven or test-driven agentic development</li><li>
Web-based geospatial / GIS development</li><li>
A sense for design and UX &mdash; enough to handle smaller design decisions autonomously</li></ul><h4 class="jobSectionHeader">
Your Benefits</h4><ul><li>
The opportunity to create a product that can improve business processes and lives across the globe.</li><li>
Flexible working hours and hybrid work model - we trust our employees to get their work done while maintaining a healthy work-life balance.</li><li>
We empower employees to drive their own career development, take initiative and have the freedom to be creative and bold.</li><li>
Not an overtime culture - we take care that overtime is done only as a necessity and always offset with time off and rest.</li><li>
A collaborative and learning environment - frequent internal workshops, knowledge sharing sessions, journal clubs and hackathons.</li><li>
Office located in the centre of Berlin Kreuzberg with free fruit, nuts and drinks.</li><li>
Potential to participate in the employee stock option program.</li><li>
Urban Sports membership and BVG subsidy, corporate pension program.</li><li>
A diverse and vibrant international environment of 30+ different nationalities.</li></ul><h4 class="jobSectionHeader">
About us</h4>
LiveEO is a well funded startup founded in 2018 and based in Berlin. Our primary service is modelling risk to our customers&rsquo; assets and infrastructure from vegetation, ground deformation and change detection. We currently have around 160 employees from all over the world with a variety of backgrounds</div>

Full Stack Engineer (f/m/x)

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