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Vacancy · Netherlands or remote in the EU

Senior full-stack engineer, applied AI

Ainur is an engineering and research firm in the Netherlands. We build and run software for our clients, and we are looking for a senior full-stack engineer who puts language models to work inside those products: an operator that handles a conversation and hands off to a person, a recommender that learns from what users do, retrieval over a client's own data.

32 to 40 a weekHours
Netherlands or EU remoteLocation
Employed or freelanceContract
As soon as possibleStart

The role

AI is one part of every system we build. The model answers a support chat and books the appointment. The system around it decides what the model may see, when it hands off, and how we know it is doing well. You build both halves: the prompts, tools and evaluation on one side, and the API, data and UI on the other. Stack: TypeScript and Go, PostgreSQL with pgvector, the model providers that fit the client's data agreements, and the agent tooling we use on our own work.

What you will work on

  • Operators inside existing processes: a model that runs a conversation with real users, calls tools against the client's systems, and hands off to a person when it has to.
  • Recommendation and personalisation: curated and learned feeds, shadow mode before go-live, weekly re-weighting, consent and opt-out built in.
  • Retrieval over a client's own documents and data, with citations and access control.
  • Evaluation: test sets, regression runs on every prompt change, and the dashboard that tells the client how it is going.
  • Agent tooling for the team: MCP servers, review bots, and the standards that keep AI-written code reviewable.

What we are looking for

  • Seven or more years building software for production, and at least one system with a model in the loop that real users depend on.
  • Senior in TypeScript across the stack, with Go or Python where the service or the tooling needs it.
  • Hands-on with model APIs, tool calling, embeddings and evaluation. You know when a smaller model, or no model, is the right answer.
  • Careful with personal data: consent, retention, where the data goes, and what the agreement with the client allows.
  • You can run a technical conversation with a client in English and write down what was decided.
  • Based in the Netherlands, or elsewhere in the EU.
  • Nice to have: pgvector or a vector database in production, fine-tuning open-weight models, Dutch.

What we offer

  • 32 to 40 hours a week. In the Netherlands, employed or freelance. Elsewhere in the EU, freelance.
  • Pay in line with the market and your experience.
  • Remote by default. In the Netherlands, on site with a client when it matters.
  • Work that is yours end to end, a designer next to you, and founders who still write code.
  • English is the working language. Dutch is welcome.

How to apply

Send a short email with your CV or LinkedIn profile and a link to something you built to [email protected]. No cover letter needed. We reply to every application. The process is a video call, a technical conversation with the engineers about something you shipped, and an offer.

Apply by email