You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Martin KosterMK

Martin Koster

Senior Fullstack Engineer (Java + TS)

€ 760/dag
Amsterdam, NL
15+ jaar

Gemiddelde responstijd: 1 uur

Over Martin

Senior fullstack engineer with 25+ years building software, 15+ as a freelance contractor in the Netherlands. Delivered production systems for clients across banking, retail, energy, government and airline — including BMG Bank, Nike EMEA, Alliander, KLM and Ministry of Infrastructure. The common thread: real client deadlines, real production code, environments where decisions have to hold up over time.

Primary stack: Java, Spring Boot, TypeScript, React. Strong on frontend design, REST/GraphQL APIs, and integration with legacy systems.

The past year I've focused on how AI-assisted software should be designed, governed, and verified. That means real engagements (an agentic business-plan generation pipeline for Startboard, integrating MCP servers and multi-agent n8n workflows), and an open-source agentic SDLC framework I built and maintain — ADW: I'm now the senior who can both ship production fullstack and reason about agent design, MCP integration, HITL gating, and where AI actually fits in an engineering team's workflow.

Available for new contracts in 2026. Senior fullstack work preferred, AI-leaning roles welcome. Based in the Netherlands, open to on-site, hybrid and remote engagements across NL and EU.
  • Duits

    Tweetalig / moedertaal

  • Afrikaans

    Beperkte professionele capaciteit

  • Engels

    Tweetalig / moedertaal

  • Nederlands

    Vloeiend

Kan op locatie werken
Amsterdam (tot 50km)

Werkervaring

  • Freelance
    Java lead developer, Front end developer
    juli 2010 - Vandaag (16 jaren en 1 maand)
    Independent senior full-stack developer (Java backend, JS/TS frontend) delivering production systems for banking, retail, energy, government and airline clients. Engagements at BMG Bank/ING, Nike EMEA, Alliander, Ministry of Infrastructure and KLM. The past year focused on agentic AI, LLM tooling and an open-source agentic SDLC framework (ADW).
    Java Typescript React.js Spring boot LLM
  • Hinttech
    Senior Java/J2EE Developer
    augustus 2004 - juni 2010 (5 jaren en 10 maanden)
    Delft, Nederland
    Senior Java/J2EE developer detached to clients Nuon (energy-saving website, customer-facing portals, agent tools, security system) and PCM (Tridion-based news portals). Java/EJB, Spring, Hibernate, Tridion, integration with mainframe and SOAP backoffices.
    Java Oracle SQL
  • Getronics PinkRoccade
    Java/J2EE Developer
    januari 1999 - juli 2004 (5 jaren en 6 maanden)
    Amersfoort, Nederland
    Java/J2EE developer on enterprise projects: AEGON Offertenet (online pension quote engine producing legally binding contracts within minutes — a Dutch first), AEGON Financial Open (intermediary portfolio system, MQ-Series link to mainframe), Achmea Ebackoffice (pensions web layer), ING ALM Redesign (Asset/Liability test automation), and CEDAR PRO clipping rights administration.
    Java

Aanbevelingen

Wees de eerste die Martin aanbeveelt

Help deze freelancer om te schitteren door te vertellen hoe het is om met hem of haar te werken.

Deze freelancerprofielen matchen ook met zoekopdracht.

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Opleidingen

  • Machine learning
    2016
    Machine learning
  • Sun Certified Java2 Programmer
    2003
    Sun Certified Java2 Programmer

Categorieën