software engineer

Katanox

<div>
 <strong>
  About Katanox
 </strong>
 <p>
  <br/>
 </p>
 <p>
  Katanox is building the infrastructure layer for hospitality: software that connects hotels and travel buyers and moves money between them. Our platform brings&nbsp;
  <strong>
   distribution and payments
  </strong>
  &nbsp;into one workflow (contracting, connectivity, reconciliation, and settlement), so partners can operate with less fragmentation and fewer manual handoffs.
 </p>
 <p>
  <br/>
 </p>
 <p>
  For engineers, this means building reliable systems that handle complex B2B workflows and real financial constraints, with a focus on data integrity, auditability, security, and operational excellence. We&rsquo;re headquartered in Amsterdam with hubs in London and New York.
 </p>
 <p>
  <br/>
 </p>
 <strong>
  Why join Katanox
 </strong>
 <p>
  <br/>
 </p>
 <ul>
  <li>
   <strong>
    Build software that moves real money
   </strong>
   : Work on Kotlin services that sit on the critical path for payments, reconciliation, and settlement.
  </li>
  <li>
   <strong>
    Solve hard problems, end-to-end
   </strong>
   : Own outcomes across data models, APIs, and the production realities (observability, reliability, compliance).
  </li>
  <li>
   <strong>
    High-trust team, high standards
   </strong>
   : Direct communication, strong engineering fundamentals, and a bias toward shipping and learning.
  </li>
  <li>
   <strong>
    In-person collaboration (hub model)
   </strong>
   : We do our best work together, spending regular time in Amsterdam, London, or New York to move faster and build trust.
  </li>
  <li>
   <strong>
    Growth-stage ownership
   </strong>
   : The surface area is big, and the team is lean; your decisions will shape the platform.
  </li>
 </ul>
 <p>
  <br/>
 </p>
 <strong>
  How we work
 </strong>
 <p>
  <br/>
 </p>
 <p>
  A cornerstone of our culture is in‑person collaboration. We follow a &ldquo;hub&rdquo; model with unique hubs in Amsterdam, London, and New York, where we regularly collaborate face‑to‑face, onboard customers and colleagues, hold design sessions, and host events.
 </p>
 <p>
  <br/>
 </p>
 <p>
  We do not hire for strictly remote roles. We expect people to spend meaningful time in our hubs because this is how we maintain our culture, build trust, and move quickly together.
 </p>
 <p>
  <br/>
 </p>
 <p>
  We&rsquo;re also a&nbsp;
  <strong>
   financially regulated
  </strong>
  &nbsp;company. That means high standards for security, auditability, and decision-making. This means your work ships with the rigor and reliability you&rsquo;d expect from systems that move real money.
 </p>
 <p>
  <br/>
 </p>
 <strong>
  Our values
 </strong>
 <p>
  <br/>
 </p>
 <p>
  At Katanox, our values are the blueprint for how we work together and build our product.
 </p>
 <ul>
  <li>
   <strong>
    Team over the individual, no ego:&nbsp;
   </strong>
   We prioritize the success of the whole team over individual agendas. We win together, share credit, and leave egos at the door.
  </li>
  <li>
   <strong>
    Data beats excitement:&nbsp;
   </strong>
   We welcome bold ideas, but we commit based on evidence. We use data, experimentation, and clear hypotheses to decide what to build.
  </li>
  <li>
   <strong>
    Dare to do:&nbsp;
   </strong>
   We are proactive, take smart risks, and move from talking to doing. We learn by shipping and improve through iteration.
  </li>
  <li>
   <strong>
    See it, own it, and close it:&nbsp;
   </strong>
   When we spot a problem or opportunity, we take responsibility to drive it to completion instead of assuming someone else will.
  </li>
  <li>
   <strong>
    We apply radical candor:&nbsp;
   </strong>
   We care personally and challenge directly. We give and receive honest feedback so we can grow faster as individuals and as a team.
  </li>
  <li>
   <strong>
    In person first, call second:&nbsp;
   </strong>
   We prioritize in‑person collaboration in our hubs to build trust, move quickly, and solve hard problems together.
  </li>
  <li>
   <strong>
    Build collaboratively:&nbsp;
   </strong>
   We actively involve the right people, share context early, and co‑create solutions across teams and disciplines.
  </li>
  <li>
   <strong>
    Iterate fast and pragmatically:&nbsp;
   </strong>
   We ship small, learn quickly, and avoid over‑engineering. We focus on solutions that work in reality, not just in theory.
  </li>
 </ul>
 <p>
  <br/>
 </p>
 <strong>
  About the role
 </strong>
 <p>
  <br/>
 </p>
 <p>
  You'll work on the backend systems at the core of Katanox. These are the services that move money between hotels, travel buyers, and payment networks, and the infrastructure that keeps bookings, pricing, and reconciliation consistent across a fragmented industry. Expect to ship Kotlin services that handle real transactions, in real time, for real customers.
 </p>
 <p>
  <br/>
 </p>
 <p>
  This role is for someone who likes ownership and depth. You'll help shape architecture with other engineers, ship iteratively, and raise the bar for reliability and correctness in a regulated environment where a missed event is a failed reservation or a misrouted payout.
 </p>
 <p>
  <br/>
 </p>
 <strong>
  What you will work on
 </strong>
 <p>
  <br/>
 </p>
 <ul>
  <li>
   Building distributed systems that move real money and real bookings between hotels, the world's largest travel agents, and payment networks, where a dropped event isn't a bug ticket, it's a failed reservation or a misrouted payout.
  </li>
  <li>
   Designing and operating high-availability components in a regulated environment, where "it usually works" isn't good enough. Think idempotency, exactly-once semantics, graceful degradation, and the kind of observability that lets you sleep at night.
  </li>
  <li>
   Working on the parts of the platform where scale is non-trivial: millions of searches per day, connectivity to a long tail of supplier and acquirer systems, and pricing/availability flows that have to stay correct under load.
  </li>
  <li>
   Going deep on a single domain (payments, distribution, contracting, reconciliation) while still understanding how the whole platform fits together, because the interesting problems at Katanox usually sit at the seams between two of them.
  </li>
  <li>
   Shaping architecture decisions, not just implementing them. We're still early enough that the choices you make this quarter will be load-bearing for years to come.
  </li>
  <li>
   Owning what you ship end-to-end: design, build, deploy, monitor, and improve. No throw-it-over-the-wall culture.
  </li>
 </ul>
 <p>
  <br/>
 </p>
 <strong>
  What we are looking for
 </strong>
 <p>
  <br/>
 </p>
 <ul>
  <li>
   You've built and operated production systems that mattered. Ideally distributed, ideally with real availability and consistency requirements. You know the difference between "passes the tests" and "behaves well at 3 am on a Sunday."
  </li>
  <li>
   Strong Kotlin or Java experience, and you're opinionated about why. You care about code that's simple, testable, and boring in the best way.
  </li>
  <li>
   You enjoy reasoning about hard problems like concurrency, failure modes, data consistency, system boundaries, and you can turn ambiguous business requirements into something that actually works.
  </li>
  <li>
   You want to work with smart, low-ego people who push you. We hire for genuine curiosity and craft, not credentials, and we expect you to make the people around you better.
  </li>
  <li>
   You're genuinely interested in the domain. Payments and travel distribution are messy, regulated, and full of edge cases. If that sounds tedious rather than interesting, this probably isn't the right role.
  </li>
  <li>
   You take ownership. When something is broken or unclear, you pick it up rather than file it under "someone else's problem."
  </li>
  <li>
   Solid fundamentals: data structures, algorithms, system design, testing.
  </li>
  <li>
   Fluent in English.
  </li>
 </ul>
 <p>
  <br/>
 </p>
 <strong>
  Tech stack snapshot
 </strong>
 <p>
  <br/>
 </p>
 <ul>
  <li>
   Backend: Kotlin, Ktor, Arrow-kt, Jooq, Postgres
  </li>
  <li>
   Frontend: React
  </li>
  <li>
   Infra: AWS, K8S
  </li>
 </ul>
 <p>
  <br/>
 </p>
</div>


Software Engineer

Insify

<div>
 <strong>
  About Insify
  <br/>
 </strong>
 We are a high-growth scale-up backed by &euro;43M in total funding from world-class investors like Accel, Munich Re Ventures, and Formula 1 champion Nico Rosberg. While we started our journey five years ago in the Netherlands, we have since expanded into France and Germany, and we&rsquo;re just getting started. Our mission is to dominate the European market and become a global leader in AI-powered SME insurance.
 <br/>
 <br/>
 We aren't just building a company; we&rsquo;re leading a revolution. Our culture is intense, high-stakes, and mission-driven. We hire smart, ambitious "owners" who possess a relentless drive to win. This is an environment for those who thrive on challenges, value intellectual honesty, and share our mindset of becoming a global category leader.
 <br/>
 <br/>
 Our founding team consists of seasoned entrepreneurs who have previously built iconic businesses like HelloFresh, Bloomon, and SumUp. We combine that deep fintech and e-commerce expertise with cutting-edge AI to stay ahead of the curve.
 <br/>
 <br/>
 In this role, your mission is simple but demanding: to take ownership of a meaningful part of Insify&rsquo;s journey and deliver results that move the company forward.
 <br/>
 <br/>
 We're looking for a Software Engineer with 3+ years of experience to join the Billing team. You'll help design and build a scalable, multi-country billing platform: payment scheduling, invoicing, dunning, fees, taxes and reconciliation across legal entities, products and markets. You'll work shoulder-to-shoulder with product, finance, legal and our insurance carriers (Axeria, Hiscox, HDI, iptiQ, Chubb, Wakam). You'll own systems end-to-end, from the data model to production behaviour, and you'll be the engineer the rest of the company trusts when money is involved.
 <br/>
 <br/>
 <strong>
  What you'll be doing:
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Build a billing platform that scales from two countries to six. Make the right abstractions now so adding a new market is a config change, not a rewrite
  </li>
  <li>
   Design and ship core billing capabilities: annual and monthly payment schedules, the Insify platform fee, VAT logic across jurisdictions, fee waiver rules, pro-rata refunds and renewals
  </li>
  <li>
   Own our dunning flow across Adyen (credit card) and Twikey (SEPA): failure classification, retries, settling checks, partial payments and country-specific legal compliance (NL 14-day statutory warning, FR mise en demeure, and whatever comes next)
  </li>
  <li>
   Build resilient integrations with payment, banking and tax providers, and keep them observable, secure and easy to swap out
  </li>
  <li>
   Handle multi-entity invoicing across Insify B.V., Insify Holding B.V., Insify NLD Agent B.V. and the entities we will add as we expand
  </li>
  <li>
   Partner with finance, legal and compliance to turn regulatory and accounting requirements into clean, testable systems. Be the engineer in the room who can credibly push back when something doesn't make sense
  </li>
  <li>
   Set the bar for engineering quality in the billing domain: idempotency, correctness, observability, recoverability. This is a domain where bugs cost real money
  </li>
  <li>
   Own incidents and operational health. When something breaks in billing, the business notices, and you'll be one of the people who fixes it
   <br/>
   <br/>
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  What you'll need:
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   3+ years of professional software engineering experience, ideally with TypeScript and AWS (Lambda, DynamoDB, event-driven architectures)
  </li>
  <li>
   A serious bar for correctness. You think in terms of edge cases, idempotency, consistency, retries, partial states and audit trails. You understand that "mostly works" is not acceptable when money moves
  </li>
  <li>
   Strong fundamentals in distributed systems, data modelling and API design. You can spot the abstraction that will hold up across five countries and four payment providers
  </li>
  <li>
   Comfort with complexity and ambiguity. Billing sits at the intersection of code, accounting, tax and law. You enjoy that instead of running from it
  </li>
  <li>
   Ownership instinct. You think of the system as yours, not as someone else's ticket queue
  </li>
  <li>
   Clear communicator. You can sit with finance, legal or a carrier and translate fuzzy requirements into a working system
  </li>
  <li>
   AI in your workflow. You actively use AI for coding, debugging and tooling to move faster
   <br/>
   <br/>
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  Nice to have:
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Experience with payment providers (Adyen, Stripe, Mollie, Twikey or similar), SEPA and card payment flows
  </li>
  <li>
   Background in fintech, insurtech, billing, subscriptions or accounting systems at scale
  </li>
  <li>
   Experience expanding a product or platform into new countries, including localisation of payments, tax and invoicing
  </li>
  <li>
   Familiarity with VAT and multi-entity invoicing across EU markets
  </li>
  <li>
   Strong observability instincts (Sentry, Datadog) and a track record of operating
   <br/>
   <br/>
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  We offer:
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Competitive compensation that reflects responsibility and impact. For mid-level engineer we have a range between 65-85k per year.
  </li>
  <li>
   Trust and autonomy: you&rsquo;ll have real ownership and room to make decisions Space to grow and shape your role as Insify evolves
  </li>
  <li>
   A steep learning curve, with support from experienced teammates
  </li>
  <li>
   The opportunity to share in what we&rsquo;re building, with equity for eligible roles once there&rsquo;s mutual conviction on fit and impact
  </li>
  <li>
   A welcoming, central Amsterdam HQ where we work closely together: shared lunches, dogs in the office, whiteboards, and fun end-of-week drinks
  </li>
  <li>
   An international, ambitious team that enjoys building meaningful things together
   <br/>
   <br/>
  </li>
 </ul>
</div>


Software Engineer, Payments Platform

Elsevier

<p></p><div><p><b>Software Engineer III (Full Stack)
</b></p><p></p><p><b>Location: Amsterdam, Netherlands
</b></p><p></p><p><b>Would you like to help create products to support the sharing of scientific knowledge?
</b></p><p></p><p><b>Do you enjoy collaborating to solve complex technical problems?
</b></p><p></p><p>This hybrid role is open to candidates based within a commutable distance of our Amsterdam office. We value meaningful in-person moments to connect, collaborate, plan and for other key moments.
</p><p></p><p><b>About Team:
</b></p><p></p><p>Our dynamic Agile team delivers the technology for Transfer your manuscript in Submissions which enables researchers to publish their work.
</p><p></p><p><b>About Role:
</b></p><p></p><p>As a Software Engineer, you will build capabilities that support scientific researchers through Transfer your manuscript in Submissions.
</p><p></p><p><b>Responsibilities:
</b></p><ul><li>Designing, developing and deploying applications in a cloud-hosted distributed system to build our next-generation product
</li><li>Collaborating with business stakeholders to identify requirements and gather feedback in a fast-moving environment
</li><li>Providing input into architectural decisions to ensure stability and performance
</li><li>Identifying and implementing enhancements to continually improve our delivery process
</li><li>Partnering with cross-functional Agile and DevOps implementation teams
</li></ul><p></p><p><b>Requirements:
</b></p><p>To be successful in this role, you will demonstrate proficiency in some of our requirements, with a willingness to learn new ones as needed.
</p><ul><li>Demonstrate some proficiency in most of these technologies; Java, JavaScript / TypeScript frameworks (React, Angular, etc), SQL, with a willingness to learn the others.
</li><li>Display some experience with version control system (i.e. Git)
</li><li>Enjoy collaborating with team members to create innovative solutions
</li><li>Have experience with a modern IDE (IntelliJ / VS Code) and proficiency in using refactoring tools
</li><li>Be open to discussing and honing approaches for our team to improve our working practices
</li><li>Have some experience with test-driven development and mocking libraries (Jest, Mockito)
</li><li>Be familiar with collaborative documentation tools (Jira and Confluence)
</li><li>Have some real knowledge of Agile practices and execution (Scrum, Kanban)
</li><li>Some familiarity with AI coding tools (GitHub Copilot, Claude, Codex, Antigravity) is desirable.
</li><li>Wanting to learn about Agentic software development
</li><li>Be eager to grow your skills and experience
</li></ul><p></p><p><b>Work in a way that works for you
</b></p><p></p><p>We promote a healthy work/life balance across the organisation. We offer an appealing working prospect for our people. With numerous wellbeing initiatives, shared parental leave, study assistance and sabbaticals, we will help you meet your immediate responsibilities and your long-term goals.
</p>Working flexible hours - flexing the times when you work in the day to help you fit everything in and work when you are the most productive<br>
<ul><li>
</li></ul><p><br>
<b>About Business
</b></p><p></p><p>At Elsevier, we help the world of research to make high-value decisions with confidence through a rich portfolio of services and products such as Scopus, Pure, and SciVal.
</p><p>This role is aimed at mid-level engineers working towards the next step in their career.<br>
</p>Primary Location Base Pay Range: NLD Amsterdam (Radarweg) &euro;49,000 - &euro;81,700. This role is covered by the Collective Labor Agreement Publishing Industry.
<p><b>We know your well-being and happiness are key to a long and successful career. We are delighted to offer country specific benefits. Click </b><b>here </b><b>to access benefits specific to your location.
</b></p><p></p><p>We are committed to providing a fair and accessible hiring process. If you have a disability or other need that requires accommodation or adjustment, please let us know by completing our Applicant Request Support Form or please contact 1-855-833-5120.
</p><p></p><p><b>Criminals may pose as recruiters asking for money or personal information. We never request money or banking details from job applicants. Learn more about spotting and avoiding scams </b><b>here </b><b>.
</b></p><p></p><p>Please read our Candidate Privacy Policy .
</p><p></p><p>We are an equal opportunity employer: qualified applicants are considered for and treated during employment without regard to race, color, creed, religion, sex, national origin, citizenship status, disability status, protected veteran status, age, marital status, sexual orientation, gender identity, genetic information, or any other characteristic protected by law.
</p><p></p><p><b><i>USA Job Seekers:
</i></b></p><p>EEO Know Your Rights .</p></div><p></p>

Software Engineer III (Full Stack)

Adyen

<div>
 <strong>
  This is Adyen
  <br/>
  <br/>
 </strong>
 Adyen provides payments, data, and financial products in a single solution for customers like Facebook, Uber, H&amp;M, and Microsoft - making us the financial technology platform of choice. At Adyen, everything we do is engineered for ambition.
 <br/>
 <br/>
 For our teams, we create an environment with opportunities for our people to succeed, backed by the culture and support to ensure they are enabled to truly own their careers. The people of Adyen are motivated individuals who tackle unique technical challenges at scale and solve them as a team. Together, we deliver innovative and ethical solutions that help businesses achieve their ambitions faster.
 <br/>
 <br/>
 <strong>
  Unified Platform
  <br/>
  <br/>
 </strong>
 The Unified Platform Is At The Heart Of Adyen&rsquo;s Infrastructure, Bringing Together Accounting, Reporting, Billing, Pricing, Reconciliation, And Configuration Into One Streamlined Experience. It Enables Us To Stay Agile And Innovative While Running a Scalable, Efficient Business. As Part Of This Initiative, We&rsquo;re Rethinking Five Core Product Areas
 <br/>
 <br/>
 <ul>
  <li>
   Platform experience &ndash; Creating a unified and intuitive backend experience across Adyen products
  </li>
  <li>
   Accounting systems &ndash; Defining a cohesive and high-performing financial architecture
  </li>
  <li>
   Reporting &amp; reconciliation &ndash; Making financial data more accurate, accessible, and satisfying for customers and regulators
  </li>
  <li>
   Billing &amp; pricing infrastructure &ndash; Simplifying pricing and automating invoicing at scale
  </li>
  <li>
   Observability &amp; tooling &ndash; Strengthening visibility and control of money movement through advanced tooling
   <br/>
   <br/>
  </li>
 </ul>
 We&rsquo;re hiring Software Engineers at both Mid and Senior levels, and have several teams actively looking for new colleagues. While all roles share a strong technical foundation, each team brings a unique focus in scaling our unified platform, We'll explore the best team fit together throughout the interview process.
 <br/>
 <br/>
 <strong>
  What You&rsquo;ll Do
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Work on complex technical projects from requirements analysis through design, implementation, testing and launch into production.
  </li>
  <li>
   Be hands-on and contribute to the implementation.
  </li>
  <li>
   Identify and improve parts of the platform to make it more robust and scalable.
  </li>
  <li>
   Bring your own point of view on best engineering practices.
  </li>
  <li>
   Your code will be used at scale and you are expected to think in that mindset when building features.
  </li>
  <li>
   We launch fast and iterate often. Concretely, this means that within your first few weeks, you will bring live functionalities that impact many merchants and shoppers.
  </li>
  <li>
   Build APIs and tooling according to quality principles such as performance and code quality.
  </li>
  <li>
   Collaborate across teams and time zones to get projects over the finish line.
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  Who You Are
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Familiar with complex large scale distributed systems.
  </li>
  <li>
   You have experience with Java, Web Services, REST Apis, Webhooks and SQL/PostgreSql.
  </li>
  <li>
   You have a good understanding of Software Engineering practices and interest in product knowledge.
  </li>
  <li>
   You enjoy working in a cross-functional team with roles like Data Science, Frontend, and Product.
  </li>
  <li>
   You value involving other people to hear different perspectives.
  </li>
  <li>
   You have an experimental mindset with a launch fast and iterate mentality.
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  Minimum Qualifications
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   5+ years of experience in software development industry in a fast paced tech environment
  </li>
  <li>
   Full professional proficiency in English
  </li>
  <li>
   This role is based out of our Amsterdam office. We are an office-first company and value in-person collaboration; we do not offer remote-only roles.
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  Our Diversity, Equity and Inclusion commitments
  <br/>
  <br/>
 </strong>
 Our unique approach is a product of our diverse perspectives. This diversity of backgrounds and cultures is essential in helping us maintain our momentum. Our business and technical challenges are unique, and we need as many different voices as possible to join us in solving them - voices like yours. No matter who you are or where you&rsquo;re from, we welcome you to be your true self at Adyen.
 <br/>
 <br/>
 Studies show that women and members of underrepresented communities apply for jobs only if they meet 100% of the qualifications. Does this sound like you? If so, Adyen encourages you to reconsider and apply. We look forward to your application.
 <br/>
 <br/>
 <strong>
  What&rsquo;s next?
  <br/>
  <br/>
 </strong>
 Ensuring a smooth and enjoyable candidate experience is critical for us. We aim to get back to you regarding your application within 5 business days. Our interview process tends to take about 4 weeks to complete, but may fluctuate depending on the role. Learn more about our hiring process here. Don&rsquo;t be afraid to let us know if you need more flexibility.
</div>


Software Engineer (Java) - Unified Platform

McKinsey & Company

<div><div><div><div><div><div><div>Job ID: 110123</div></div></div></div><div></div><div><ul><div>
Amsterdam</div></ul></div><div></div><div><div><div><br>
</div></div></div></div><div><p>
Do you want to do work that matters, alongside supportive leaders who will help you grow faster than you ever thought possible? Are you a creative problem-solver who is energized by challenges? You&rsquo;ve come to the right place.</p><div><p>
YOUR IMPACT</p><div><div><p>
You will collaborate with a global network of technologists, designers, and strategists to help clients transform their businesses through innovative digital solutions.</p><p></p><p>
You&rsquo;ll develop cutting-edge products, mentor client teams, and shape engineering cultures while growing your expertise across diverse industries and technologies.</p><p></p><p>
You will work hands-on with clients across industries to bring their digital ambitions to life. You will develop software products and services from the ground up while coaching and mentoring client teams on engineering best practices, user-centric design, and Agile values. By co-creating with clients and their leadership, you&rsquo;ll help build not only cutting-edge products but also the technical capabilities and cultures needed to sustain them.</p><p></p><p>
Your work will drive meaningful change for clients and their industries. You will participate in cross-functional problem-solving sessions with client leaders, shaping their digital strategies and delivering solutions that go beyond the product itself. Your efforts will help clients build scalable teams and engineering cultures that enable long-term success.</p><p></p><p>
You will collaborate with clients across industries to turn their digital ambitions into reality through hands-on technical expertise. Based in one of our global locations, you will be part of QuantumBlack, AI by McKinsey, a multidisciplinary group of software engineers, AI engineers, data scientists, and technology consultants passionate about creating industry-shaping products and tools.</p><p></p><p>
You&rsquo;ll grow as a technologist and leader. You&rsquo;ll work across diverse industries and technologies, learning something new with every project. With opportunities to contribute to digital strategies, build impactful products, and mentor others, you&rsquo;ll have the freedom to chart your own path and grow in the areas that excite you most.</p></div></div></div><div><p>
YOUR GROWTH</p><div><p>
Driving lasting impact and building long-term capabilities with our clients is not easy work. You are the kind of person who thrives in a high performance/high reward culture - doing hard things, picking yourself up when you stumble, and having the resilience to try another way forward.</p><p></p><p>
In return for your drive, determination, and curiosity, we'll provide the resources, mentorship, and opportunities you need to become a stronger leader faster than you ever thought possible. Your colleagues&mdash;at all levels&mdash;will invest deeply in your development, just as much as they invest in delivering exceptional results for clients. Every day, you'll receive apprenticeship, coaching, and exposure that will accelerate your growth in ways you won&rsquo;t find anywhere else.</p><p></p><p>
When you join us, you will have:</p><p></p><div><ul><li>
Continuous learning: Our learning and apprenticeship culture, backed by structured programs, is all about helping you grow while creating an environment where feedback is clear, actionable, and focused on your development. The real magic happens when you take the input from others to heart and embrace the fast-paced learning experience, owning your journey.</li><li>
A voice that matters: From day one, we value your ideas and contributions. You&rsquo;ll make a tangible impact by offering innovative ideas and practical solutions, all while upholding our unwavering commitment to ethics and integrity. We not only encourage diverse perspectives, but they are critical in driving us toward the best possible outcomes.</li><li>
Global community: With colleagues across 65+ countries and over 100 different nationalities, our firm&rsquo;s diversity fuels creativity and helps us come up with the best solutions for our clients. Plus, you&rsquo;ll have the opportunity to learn from exceptional colleagues with diverse backgrounds and experiences.</li><li>
World-class benefits: On top of a competitive salary (based on your location, experience, and skills), we provide a comprehensive benefits package to enable holistic well-being for you and your family.</li></ul></div></div></div></div></div><div><div><div><p>
YOUR QUALIFICATIONS AND SKILLS</p><div><div><ul><p>
Undergraduate or master&rsquo;s degree; or equivalent experience</p><p>
2+ years of experience developing full-stack applications by writing code that is readable, testable, maintainable, and scalable</p><p>
Demonstrated experience working collaboratively with other developers, as well as technical and non-technical people within software teams</p><p>
Hands-on experience and willingness to learn across frontend (TypeScript, React, Angular, Vue, Next.js, Tailwind), backend (Python, Node.js, Java/Spring, C#/.NET), and databases (SQL, NoSQL, vector databases, ETL)</p><p>
Experience with LLM frameworks, prompt orchestration, agent frameworks, MCPs, evaluation frameworks, and cloud platforms (Azure, AWS, GCP), including Docker and CI/CD</p><p>
Strong focus on automated testing, logging, monitoring, and overall system reliability</p><p>
Experience working in Agile teams, including active participation in sprint ceremonies</p><p>
Experience pair programming collaboratively with other developers</p><p>
Exceptional time management to meet your responsibilities in a complex and largely autonomous work environment</p><p>
Strong communication skills, both verbal and written, in English and local language, with the ability to adjust your style to suit different perspectives and seniority levels</p></ul></div></div></div></div></div><div><div><div><div>
Please review the additional requirements regarding essential job functions of McKinsey colleagues.</div>
<div>Our unwavering commitment to integrity drives everything we do, guiding us to always act in the best interests of our clients, our people, and the communities we serve.</div></div></div></div></div>

Software Engineer - QuantumBlack, AI by McKinsey

Alignerr

<div>
 <strong>
  About The Role
  <br/>
  <br/>
 </strong>
 What if your machine learning expertise could directly influence how the most advanced AI systems in the world think, reason, and write code? We're looking for experienced ML engineers in Amsterdam and across the Netherlands to evaluate AI-generated machine learning solutions &mdash; catching errors, improving quality, and helping frontier AI models get genuinely better at one of the hardest things they do.
 <br/>
 <br/>
 This is a fully remote, flexible contract role. Work asynchronously on your own schedule, from wherever you are. No fixed hours, no meetings &mdash; just high-impact, expert work that matters.
 <br/>
 <br/>
 <ul>
  <li>
   Organization: Alignerr
  </li>
  <li>
   Type: Hourly Contract
  </li>
  <li>
   Location: Remote (Netherlands)
  </li>
  <li>
   Commitment: Flexible, project-based
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  What You'll Do
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Review and evaluate AI-generated machine learning code &mdash; including Python, TensorFlow, PyTorch, and scikit-learn &mdash; for correctness, efficiency, scalability, and clarity
  </li>
  <li>
   Write high-quality ML solutions to modeling, data processing, and deployment problems across a range of difficulty levels
  </li>
  <li>
   Craft clear, developer-friendly explanations for model architecture decisions, code logic, and problem-solving approaches
  </li>
  <li>
   Identify edge cases, ambiguities, and weaknesses in problem statements, datasets, or AI-generated responses
  </li>
  <li>
   Help set the quality bar for how AI understands and produces machine learning code
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  Who You Are
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Deeply fluent in machine learning &mdash; you know your way around model development, data preprocessing, training pipelines, and deployment
  </li>
  <li>
   Hands-on experience with ML frameworks such as TensorFlow, PyTorch, or scikit-learn
  </li>
  <li>
   Strong written communicator &mdash; able to explain complex ML concepts clearly and precisely
  </li>
  <li>
   Detail-oriented and rigorous &mdash; you catch what others miss and care about getting things right
  </li>
  <li>
   Self-motivated and comfortable working independently in an async environment
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  Nice to Have
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   3&ndash;5+ years working on machine learning projects, pipelines, or MLOps
  </li>
  <li>
   Experience with model evaluation, cloud deployment, or production ML systems
  </li>
  <li>
   Bachelor's, Master's, or PhD in Computer Science, Machine Learning, or a related field
  </li>
  <li>
   Background in data labeling, RLHF, or other AI training workflows
  </li>
  <li>
   Prior experience with code review or technical writing
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  Why Join Us
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Work on cutting-edge AI projects alongside leading research labs and top AI teams
  </li>
  <li>
   Fully remote and async &mdash; work when and where it suits you, with no minimum hour commitments beyond project needs
  </li>
  <li>
   Freelance autonomy with the structure of meaningful, task-based work
  </li>
  <li>
   Your contributions directly improve AI models used by top research labs and enterprise teams worldwide
  </li>
  <li>
   High-performing contributors take on expanded responsibilities and lead new programs
  </li>
  <li>
   Potential for ongoing work and contract extension as new projects launch
  </li>
 </ul>
</div>


Software Engineer – Machine Learning (AI Training)

<div><div><div><div><div><div><div>Job ID: 110124</div></div></div></div><div></div><div><ul><div>
Amsterdam</div></ul></div><div></div><div><div><div><br>
</div></div></div></div><div><p>
Do you want to do work that matters, alongside supportive leaders who will help you grow faster than you ever thought possible? Are you a creative problem-solver who is energized by challenges? You&rsquo;ve come to the right place.</p><div><p>
YOUR IMPACT</p><div><div><p>
You will lead architecture design, drive technology decisions, and co-create innovative products while mentoring clients to adopt Agile practices and engineering excellence. Your work offers hands-on collaboration, diverse industry exposure, and opportunities to shape solutions and grow as a technology leader.</p><p></p><p>
You will lead project workstreams, drive architectural decisions, and build scalable solutions using Agile methodologies. Working closely with client teams, you will co-create products, foster a culture of engineering excellence, and mentor teams in best practices. Your responsibilities will include shaping technical strategies, making key technology decisions, and ensuring the delivery of impactful, user-centric solutions.</p><p></p><p>
Your work will have a lasting impact beyond the products you build. By collaborating with client leadership, you will influence their digital strategies, help scale their engineering cultures, and enable them to achieve sustainable growth. Each project will expose you to diverse industries and technologies, providing opportunities to learn and grow while shaping the future of technology.</p><p></p><p>
You will design and deliver next-generation products that transform businesses across industries. Based in one of our global locations, you will be part of QuantumBlack, AI by McKinsey, a multidisciplinary group of software engineers, AI engineers, data scientists, and technology consultant passionate about creating industry-shaping products and tools.</p><p></p><p>
Your role offers unparalleled opportunities for growth and innovation. You&rsquo;ll have a seat at the table with client leaders, the chance to shape product strategies, and the freedom to explore areas of personal interest. Supported by a collaborative and innovative team, you&rsquo;ll make a lasting impact on clients, industries, and the future of technology.</p></div></div></div><div><p>
YOUR GROWTH</p><div><p>
Driving lasting impact and building long-term capabilities with our clients is not easy work. You are the kind of person who thrives in a high performance/high reward culture - doing hard things, picking yourself up when you stumble, and having the resilience to try another way forward.</p><p></p><p>
In return for your drive, determination, and curiosity, we'll provide the resources, mentorship, and opportunities you need to become a stronger leader faster than you ever thought possible. Your colleagues&mdash;at all levels&mdash;will invest deeply in your development, just as much as they invest in delivering exceptional results for clients. Every day, you'll receive apprenticeship, coaching, and exposure that will accelerate your growth in ways you won&rsquo;t find anywhere else.</p><p></p><p>
When you join us, you will have:</p><p></p><div><ul><li>
Continuous learning: Our learning and apprenticeship culture, backed by structured programs, is all about helping you grow while creating an environment where feedback is clear, actionable, and focused on your development. The real magic happens when you take the input from others to heart and embrace the fast-paced learning experience, owning your journey.</li><li>
A voice that matters: From day one, we value your ideas and contributions. You&rsquo;ll make a tangible impact by offering innovative ideas and practical solutions, all while upholding our unwavering commitment to ethics and integrity. We not only encourage diverse perspectives, but they are critical in driving us toward the best possible outcomes.</li><li>
Global community: With colleagues across 65+ countries and over 100 different nationalities, our firm&rsquo;s diversity fuels creativity and helps us come up with the best solutions for our clients. Plus, you&rsquo;ll have the opportunity to learn from exceptional colleagues with diverse backgrounds and experiences.</li><li>
World-class benefits: On top of a competitive salary (based on your location, experience, and skills), we provide a comprehensive benefits package to enable holistic well-being for you and your family.</li></ul></div></div></div></div></div><div><div><div><p>
YOUR QUALIFICATIONS AND SKILLS</p><div><div><ul><p>
Bachelors, Master&rsquo;s or PhD level degree in a discipline such as: computer science, machine learning, applied statistics, mathematics, engineering or artificial intelligence</p><p>
7+ years of experience in software development, with significant full-stack web application development experience strongly preferred</p><p>
Experience working collaboratively with technical and non-technical team members and stakeholders</p><p>
Hands-on experience and willingness to learn across frontend (TypeScript, React, Angular, Vue, Next.js, Tailwind), backend (Python, Node.js, Java/Spring, C#/.NET), and databases (SQL, NoSQL, vector databases, ETL)</p><p>
Experience with LLM frameworks, prompt orchestration, agent frameworks, MCPs, evaluation frameworks, and cloud platforms (Azure, AWS, GCP), including Docker and CI/CD</p><p>
Strong focus on automated testing, logging, monitoring, and overall system reliability</p><p>
Experience modeling and coaching others to use engineering best practices such as design patterns, customer-centric design, test-driven development, code refactoring, code review, and OWASP Top 10 security awareness</p><p>
Experience leading in Agile teams, including coaching and modeling Agile mindsets as part of sprint ceremonies, work definition and building developer capabilities</p><p>
Exceptional time management to meet your responsibilities in a complex and largely autonomous work environment</p><p>
Strong communication skills, both verbal and written, in English and local office language(s), with the ability to adjust your style to suit different perspectives and seniority levels</p></ul></div></div></div></div></div><div><div><div><div>
Please review the additional requirements regarding essential job functions of McKinsey colleagues.</div>
<div>Our unwavering commitment to integrity drives everything we do, guiding us to always act in the best interests of our clients, our people, and the communities we serve.</div></div></div></div></div>

Senior Software Engineer - QuantumBlack, AI by McKinsey

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