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Chiel TimmermansCT

Chiel Timmermans

Freelance Senior Software Engineer

€1,000/day
Zwolle, NL
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Chiel

I am a Dutch software engineer who believes correctness is enforceable — by the compiler, the database, and the tooling. I write Go, think in PostgreSQL, and specialize in Protobuf. My stack is opinionated: row-level security over application-layer trust, generated code over handwritten boilerplate, exhaustive linting as standard.
I build API-first. The spec comes before implementation, clients are generated, breaking changes happen in a PR — not in production. I document architectural decisions as RFDs: rough ideas are shared early, but once a decision is made, it lives forever in version control.
  • Dutch

    Native or bilingual

  • English

    Fluent

Can work on-site
Zwolle (up to 50km)

Experience

  • Digilab, VNG,
    Senior Software Engineer
    PUBLIC SECTOR
    August 2023 - Today (2 years and 10 months)
    Utrecht, Netherlands
    At Digilab, the Dutch government's innovation lab, I develop proof of concepts to experiment with new technologies and explore applications within the public sector. My current objective is developing Fundament, an open-source sovereign cloud platform for the government. My role within this project is architecting and building Fundament's infrastructure stack (Go, PSQL, Protobuf). A core part of our work is organizing fieldlabs - intensive multi-day proof-of-concept events where developers, architects, policy makers and legal experts from across the government work together on real-world challenges. I helped build and maintain the technical fieldlab environment: a Kubernetes-based platform running on GCP using GitOps (Flux), Helm, built with Go, Rust, PSQL and Svelte.
    GO PostgreSQL Kubernetes Docker OpenAPI
  • Shell Energy,
    Freelance Senior Software Engineer
    ENERGY AND UTILITIES
    June 2022 - August 2023 (1 year and 2 months)
    Rotterdam, Netherlands
    At Shell Energy I worked on a platform delivering electricity and gas to consumers on the Dutch market. As senior developer, I was responsible for managing the backend team, mentoring junior and mid-level developers while owning the technical direction of the platform's backend. My primary focus was designing and developing a REST API to increase customer self-service capabilities, collaborating with both internal Shell teams and external partners. The stack was built in Go, running on AWS with SQS for message queuing.
    REST APIs GO external-api-integration API-first
  • QR Link,
    Co-Founder
    SOFTWARE PUBLISHING
    January 2020 - Today (6 years and 5 months)
    Zwolle, Netherlands
    QR Link is a SaaS platform that connects physical and digital media through dynamic QR codes, short links and mobile landing pages. As co-founder, I lead the development and maintenance of the full platform - from backend to infrastructure. Beyond engineering, I'm responsible for business operations including customer support, invoicing and privacy compliance. The stack is built with Go and MySQL for the backend, VueJS for frontend, running on Docker.
    API-first Docker software-architecture CI/CD

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Education

  • Embedded Software Engineer NHL
    Stenden University
    2020
    Embedded Software Engineer NHL
  • Accreditation of course: Embedded Software Engineer
    2020
    Accreditation of course: Embedded Software Engineer

Skill set

Categories