backend developer

Client Server

<div>
 <p>
  <strong>
   <u>
    Full Stack Developer / Engineer (Kotlin AWS JavaScript) Amsterdam to &euro;85,000
   </u>
  </strong>
 </p>
 <p>
  <br/>
 </p>
 <p>
  Are you a skilled Full Stack Developer looking for an opportunity to progress your career whilst working with a modern tech stack and continually improving your skills?
 </p>
 <p>
  <br/>
 </p>
 <p>
  You could be joining a scaling, global FinTech company, working on a successful product that helps global companies to achieve sustainability and NetZero targets via Blockchain technology solutions.
 </p>
 <p>
  <br/>
 </p>
 <p>
  As a Full Stack Developer you will work across the full technology stack with a focus on Kotlin backend systems but also with some front end (JavaScript, Angular / React) work. You'll quickly gain an understanding of the complete ecosystem of the modern, distributed application with a broad scope of work including AWS, mobile applications, trading and transfer functionality and integration of 3rd party platforms.
 </p>
 <p>
  <br/>
 </p>
 <p>
  This is an opportunity to work on worthwhile technology that is helping to increase decarbonisation whilst working on complex and interesting systems with continual learning opportunities.
 </p>
 <p>
  <br/>
 </p>
 <p>
  <strong>
   WFH Policy:
  </strong>
 </p>
 <p>
  You'll join colleagues in the Amsterdam office two days a week with flexibility to work from home the other three days.
 </p>
 <p>
  <br/>
 </p>
 <p>
  <strong>
   About you:
  </strong>
 </p>
 <ul>
  <li>
   You have strong serverside Kotlin experience (Java background is good)
  </li>
  <li>
   You have experience with Spring Boot and microservices
  </li>
  <li>
   You have a thorough understanding of Computer Science fundamentals such as OOP, Design Patterns, Data Structures
  </li>
  <li>
   You have a good knowledge of AWS
  </li>
  <li>
   You have a good understanding of CI/CD, DevOps
  </li>
  <li>
   You also have some JavaScript, Angular, React front end skills
  </li>
  <li>
   You're collaborative, enjoy problem solving and continually learning
  </li>
  <li>
   You're keen to work in a start-up / scale-up environment with lots of ownership
  </li>
 </ul>
 <p>
  <br/>
 </p>
 <p>
  <strong>
   What's in it for you:
  </strong>
 </p>
 <ul>
  <li>
   Salary to &euro;85,000
  </li>
  <li>
   Flexible working in a relaxed technology focussed environment
  </li>
  <li>
   Continual learning and self-development opportunities
   <strong>
   </strong>
  </li>
 </ul>
 <p>
  <br/>
 </p>
 <p>
  <strong>
   Apply now
  </strong>
  to find out more about this Full Stack Developer / Engineer (Kotlin AWS JavaScript) opportunity.
 </p>
</div>


Full Stack Developer Kotlin AWS JavaScript - Start-up

PRACYVA

<div>
 <p>
  <strong>
   Java Full Stack Developer (8- 10 Yrs)
  </strong>
 </p>
 <p>
  <strong>
   Key Skills &amp; Responsibilities
  </strong>
 </p>
 <ul>
  <li>
   Develop scalable, enterprise-grade applications using Java, Spring Boot, and Microservices.
  </li>
  <li>
   Build responsive and modern user interfaces using Angular or React.
  </li>
  <li>
   Design and implement RESTful APIs and backend services.
  </li>
  <li>
   Develop Kafka-based event-driven solutions.
  </li>
  <li>
   Implement logging, monitoring, and observability using ELK Stack.
  </li>
  <li>
   Participate in system architecture discussions and contribute to HLD/LLD.
  </li>
  <li>
   Deploy and support applications on Azure Cloud.
  </li>
  <li>
   Work closely with business, architecture, and DevOps teams to deliver end-to-end solutions.
  </li>
 </ul>
 <p>
  <strong>
   Must-Have Skills
  </strong>
 </p>
 <ul>
  <li>
   Java 8/11/17+, Spring Boot, Microservices
  </li>
  <li>
   Angular (Preferred) / React
  </li>
  <li>
   REST APIs
  </li>
  <li>
   Kafka
  </li>
  <li>
   Elasticsearch &amp; ELK Stack
  </li>
  <li>
   Azure Cloud
  </li>
  <li>
   HLD/LLD &amp; Design Patterns
  </li>
 </ul>
 <p>
  <strong>
   Preferred
  </strong>
 </p>
 <ul>
  <li>
   ING landscape/domain experienc
  </li>
  <li>
   Experience in banking/financial services environments
  </li>
  <li>
   CI/CD and DevOps exposure (Git, Jenkins, Azure DevOps)
  </li>
 </ul>
 <p>
  <br/>
 </p>
</div>


Java Fullstack

Hoppinger

<div><ul><li>Engineering
</li><li>32-40 uur</li></ul>
<div></div><div><div><div><div><div><div>Wij zoeken een ervaren .NET-developer die het bouwen en live brengen van robuuste software als vak ziet, en die graag voorop loopt als het gaat om nieuwe technologie. Iemand met een stevige basis in C#/.NET, die kwaliteit en onderhoudbaarheid vooropstelt, en die onze beweging naar een AI-first manier van werken niet afwacht maar mede vormgeeft. Het zwaartepunt van deze rol ligt bij development. Je schrijft code, bouwt features en lost vraagstukken op binnen de platformen die we voor onze klanten ontwikkelen. Daarnaast denk je actief mee over hoe we ons werk en onze oplossingen beter maken met nieuwe technologie. AI speelt daarin een steeds grotere rol, en we zoeken iemand die die ontwikkeling met plezier oppakt.</div><div><div><div><div><h2 class="jobSectionHeader"><b>
Groeien met Hoppinger</b></h2><p>
We zijn eerlijk over waar we staan. Onze platformen voor bedrijfskritische processen in zorg, housing, kennis en onderwijs en industrie zijn gebouwd op een stevige softwarebasis, met C#/.NET als belangrijk fundament. Dat fundament blijft de komende jaren leidend, en daar hebben we ervaren developers voor nodig.</p><p>
Tegelijk groeien we naar een AI-first manier van werken. We investeren in kennis, tooling en concrete AI-toepassingen binnen onze platformen, en onderzoeken doorlopend hoe AI ons werk verbetert. AI is voor deze rol geen hoofdtaak, maar wel een onderdeel dat groeit. We verwachten niet dat je daar al expert in bent. We zoeken wel iemand die die transformatie aandurft, het in de praktijk toepast en mee wil groeien terwijl we die stap als organisatie zetten.</p><h2 class="jobSectionHeader"><b>
Jouw rol</b></h2><p>
Je werkt in een multidisciplinair team aan platformen voor onze opdrachtgevers. Je vertaalt functionele wensen naar werkende software, bewaakt de kwaliteit van wat je oplevert en denkt mee over de technische aanpak. Je staat met beide benen in de code, en je houdt van vernieuwen waar dat de oplossing beter maakt.</p><p>
Je dagen bestaan onder andere uit:</p><ul><li>
Het ontwerpen, bouwen en testen van features in C#/.NET</li><li>
Het schrijven van onderhoudbare, goed geteste code en het meedenken over de architectuur van onze platformen</li><li>
Het meedraaien in code reviews en het delen van kennis met je teamgenoten</li><li>
Het werkend houden van software in productie: stabiliteit, performance en beveiliging</li><li>
Het verkennen en toepassen van nieuwe technologie, waaronder AI, van slimmere ontwikkeltooling tot AI-functionaliteit in onze oplossingen</li><li>
Het samenwerken met andere engineers, experience architects en data-analisten</li></ul><h2 class="jobSectionHeader"><b>
Wie ben jij</b></h2><p>
Je bent een ervaren software engineer met een sterke .NET-achtergrond. Je hebt aantoonbaar software gebouwd en live gebracht, en je hecht aan kwaliteit. Je bent nieuwsgierig naar nieuwe technologie en je wacht niet tot anderen die hebben uitgeprobeerd. De stap naar AI-first die wij als organisatie zetten, zie jij als een kans om aan mee te bouwen.</p><p>
Je herkent jezelf hierin:</p><ul><li>
Ruime ervaring in softwareontwikkeling, met C#/.NET als vaste waarde in je gereedschapskist. Dit is een harde eis</li><li>
Kennis van softwarearchitectuur: API-design, microservices, event-driven architectuur en containerisatie</li><li>
Oog voor kwaliteit: testbaarheid, onderhoudbaarheid en het meedenken over technische keuzes</li><li>
Een innovatiegedreven instelling: je volgt nieuwe ontwikkelingen en past ze toe waar ze waarde toevoegen</li><li>
Nieuwsgierigheid naar AI en de bereidheid om dit een groeiend onderdeel van je werk te maken. Ervaring is een pr&eacute;, geen eis</li><li>
Het vermogen om in een multidisciplinair team te werken en je kennis te delen</li></ul><h2 class="jobSectionHeader"><b>
Wat bieden wij</b></h2><p>
Veel vrijheid en een ambitieuze cultuur waar persoonlijke ontwikkeling centraal staat. Natuurlijk draait niet alles om werk, en bovenop alle gebruikelijke benefits die je mag verwachten bieden we ook:</p><ul><li>
Salaris: een marktconform salaris (medior t/m senior schaal) op basis van 40 uur en afhankelijk van ervaring</li><li>
Celebration Leave: ruil 3 nationale feestdagen in voor jouw eigen feestdagen</li><li>
Alleo: kies extra benefits op basis van je eigen interesses</li><li>
100% doorbetaald partnerverlof: voor een goede start van je gezin</li><li>
Hybride werken: flexibiliteit om te werken vanuit onze inspirerende kantoren in Rotterdam en Utrecht (De Bilt) of vanuit huis</li><li>
Multidisciplinaire teams: werk samen met ambitieuze collega's</li><li>
Opleidingsbudget: voor jouw persoonlijke en professionele ontwikkeling</li><li>
Lerende organisatie: groei in een omgeving vol kennisdeling en innovatie</li><li>
Gratis lunch: met aandacht voor gezond eten, samen lunchen en vaste tradities zoals Krokettenwoensdag</li></ul><h2 class="jobSectionHeader"><b>
Even kort over Hoppinger</b></h2><p>
Hoppinger is een Digital Partner die organisaties helpt versnellen in hun digitale groei en innovatie. Wij gidsen opdrachtgevers bij strategische keuzes en de ontwikkeling van platformen voor bedrijfskritische klant- en kernprocessen. Door onze expertise over meerdere disciplines, sectorervaring en bewezen methodieken realiseren we digitale oplossingen die waarde cre&euml;ren voor organisaties, medewerkers en eindgebruikers. Voor nu, en in de toekomst.</p><p>
We werken voor organisaties in impactvolle sectoren zoals zorg, educatie, industrie en dienstverlening.</p><h2 class="jobSectionHeader"><b>
 nu</b></h2><p>
Wil je ons team versterken als .NET Developer? Dan horen we graag van je.</p><p>
Heb je vooraf nog vragen, neem gerust contact op via 010-2210190 of mail Carlijn van den Bos via [email protected].</p><p>
Voldoe je niet aan 100% van de genoemde eisen? Laat je daar niet door tegenhouden. We leren je liever kennen dan dat we een goede match mislopen.</p><h2 class="jobSectionHeader"><b>
Direct interesse? Solliciteer </b><b>hier</b></h2></div></div></div></div></div></div></div></div><div><div><h2 class="jobSectionHeader"><b>
Vragen of direct solliciteren?</b></h2><div><p>
Zie je jezelf bij ons werken? Stuur dan direct je CV, we leren je graag kennen! Liever nog even sparren over deze functie met een toekomstig collega? Mag ook! Neem dan even contact op.</p></div></div></div></div></div><div></div>

.NET developer

Hi Tech-IT

<div>
 <p>
  <strong>
   DevOps Engineer
  </strong>
 </p>
 <p>
  Bouw mee aan innovatieve IT-oplossingen
 </p>
 <p>
  Ben jij een DevOps Engineer die graag software ontwikkelt &eacute;n infrastructuur automatiseert? Werk je graag met moderne technologie&euml;n en wil je een belangrijke rol spelen in het ontwikkelen van schaalbare en betrouwbare oplossingen? Dan is dit een functie waarin je veel technische uitdaging en vrijheid vindt.
 </p>
 <p>
  Wat ga je doen?
 </p>
 <p>
  Als DevOps Engineer werk je binnen een multidisciplinair team aan de ontwikkeling en verbetering van software die wordt ingezet binnen complexe IT-omgevingen. Je bent betrokken bij het volledige ontwikkelproces: van ontwerp en implementatie tot automatisering en optimalisatie.
 </p>
 <p>
  <br/>
 </p>
 <p>
  Je werkzaamheden bestaan onder andere uit:
 </p>
 <ul>
  <li>
   Ontwikkelen van backend applicaties en API's.
  </li>
  <li>
   Bouwen en verbeteren van CI/CD pipelines.
  </li>
  <li>
   Automatiseren van deployment- en beheerprocessen.
  </li>
  <li>
   Werken met containers en cloud-native technologie&euml;n.
  </li>
  <li>
   Integreren van verschillende systemen en platformen.
  </li>
  <li>
   Optimaliseren van prestaties, stabiliteit en schaalbaarheid.
  </li>
  <li>
   Samenwerken met softwareontwikkelaars, cloud engineers en infrastructuurspecialisten.
  </li>
  <li>
   Actief meedenken over technische verbeteringen en nieuwe oplossingen.
  </li>
 </ul>
 <p>
  <br/>
 </p>
 <p>
  Wat neem je mee?
 </p>
 <ul>
  <li>
   HBO- of WO-werk- en denkniveau.
  </li>
  <li>
   Ervaring met softwareontwikkeling, bij voorkeur in Python, Go of Java.
  </li>
  <li>
   Ervaring met Git en CI/CD tooling.
  </li>
  <li>
   Goede kennis van Linux.
  </li>
  <li>
   Ervaring met Docker en Kubernetes.
  </li>
  <li>
   Kennis van Infrastructure as Code, zoals Terraform of Ansible, is een pr&eacute;.
  </li>
  <li>
   Je bent analytisch, zelfstandig en houdt van technische uitdagingen.
  </li>
  <li>
   Goede beheersing van de Nederlandse taal.
  </li>
 </ul>
 <p>
  <br/>
 </p>
 <p>
  Wat krijg je ervoor terug?
 </p>
 <ul>
  <li>
   Een uitstekend salaris afhankelijk van jouw kennis en ervaring.
  </li>
  <li>
   Leaseauto of mobiliteitsbudget.
  </li>
  <li>
   Hybride werken met veel flexibiliteit.
  </li>
  <li>
   Laptop en telefoon van de zaak.
  </li>
  <li>
   Uitstekende pensioenregeling.
  </li>
  <li>
   Opleidingsbudget en volop certificeringsmogelijkheden.
  </li>
  <li>
   Werken met de nieuwste technologie&euml;n binnen uitdagende projecten.
  </li>
  <li>
   Veel ruimte voor eigen initiatief en persoonlijke ontwikkeling.
  </li>
  <li>
   Een informele organisatie met korte lijnen en een collegiale werksfeer.
  </li>
 </ul>
 <p>
  <br/>
 </p>
 <p>
  Waarom deze functie?
 </p>
 <p>
  Je komt terecht in een technisch gedreven organisatie waar innovatie, automatisering en kwaliteit centraal staan. Je krijgt veel verantwoordelijkheid, werkt met moderne tooling en hebt alle ruimte om jezelf verder te ontwikkelen als DevOps Engineer.
 </p>
 <p>
  Interesse? Neem contact op voor meer informatie of solliciteer direct.
 </p>
</div>


DevOps 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

Alignerr

<div>
 <strong>
  About The Role
  <br/>
  <br/>
 </strong>
 What if the code you write could directly power the AI systems shaping how millions of people interact with technology? We're looking for Back End Developers in Amsterdam to design, build, and optimize the server-side systems and APIs that drive cutting-edge AI products &mdash; from data pipelines and model-serving infrastructure to scalable microservices that handle real-world traffic at scale.
 <br/>
 <br/>
 This is a fully remote, flexible contract role. Whether you're a seasoned engineer looking for meaningful project work or a strong developer ready to apply your skills to AI-adjacent infrastructure, this is your chance to build things that matter.
 <br/>
 <br/>
 <ul>
  <li>
   Organization: Alignerr
  </li>
  <li>
   Type: Hourly Contract
  </li>
  <li>
   Location: Remote
  </li>
  <li>
   Commitment: 10&ndash;40 hours/week
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  What You'll Do
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Design, develop, and maintain robust back end services, APIs, and data pipelines
  </li>
  <li>
   Build scalable, high-performance server-side architecture to support AI training and inference workloads
  </li>
  <li>
   Write clean, well-documented, and testable code following engineering best practices
  </li>
  <li>
   Integrate with databases, message queues, cloud services, and third-party APIs
  </li>
  <li>
   Optimize system performance, reliability, and scalability as usage grows
  </li>
  <li>
   Collaborate asynchronously with distributed teams of engineers, researchers, and product leads
  </li>
  <li>
   Troubleshoot production issues, conduct code reviews, and contribute to architectural decisions
  </li>
  <li>
   Work independently on task-based and project-based assignments on your own schedule
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  Who You Are
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Proficient in one or more back end languages &mdash; Python, Go, Java, Node.js, Rust, or similar
  </li>
  <li>
   Solid understanding of RESTful API design, microservices architecture, and distributed systems
  </li>
  <li>
   Experienced with relational and/or NoSQL databases (PostgreSQL, MongoDB, Redis, etc.)
  </li>
  <li>
   Comfortable working with cloud platforms such as AWS, GCP, or Azure
  </li>
  <li>
   Familiar with version control (Git), CI/CD pipelines, and containerization (Docker, Kubernetes)
  </li>
  <li>
   Strong problem-solving skills and the ability to debug complex systems independently
  </li>
  <li>
   Self-motivated, reliable, and effective when working asynchronously without close supervision
  </li>
  <li>
   Clear communicator who can document decisions and collaborate across time zones
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  Nice to Have
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Experience building infrastructure for machine learning or AI systems
  </li>
  <li>
   Familiarity with data processing frameworks (Apache Kafka, Spark, Airflow, or similar)
  </li>
  <li>
   Background in performance optimization, caching strategies, or high-throughput systems
  </li>
  <li>
   Knowledge of authentication, authorization, and security best practices
  </li>
  <li>
   Experience with serverless architectures or event-driven design patterns
  </li>
  <li>
   Contributions to open-source projects or a strong portfolio of personal/professional work
   <br/>
   <br/>
  </li>
 </ul>
 <strong>
  Why Join Us
  <br/>
  <br/>
 </strong>
 <ul>
  <li>
   Work on cutting-edge AI infrastructure projects alongside leading research labs
  </li>
  <li>
   Fully remote and flexible &mdash; set your own hours and work from anywhere
  </li>
  <li>
   Freelance autonomy with access to meaningful, technically challenging work
  </li>
  <li>
   Build systems at the intersection of software engineering and artificial intelligence
  </li>
  <li>
   Collaborate with a global network of talented engineers and researchers
  </li>
  <li>
   Potential for ongoing work and contract extension as new projects launch
  </li>
 </ul>
</div>


Back End Developer (AI Infrastructure)

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

Explore 26+ Backend developer in Amsterdam this July. Find roles across top companies and apply now to boost your career.