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Senior Fullstack DeveloperReaktor · Amsterdam
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Reaktor

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Senior Fullstack Developer

🗓️ Posted 2026-07-03 Amsterdam Fulltime Hybrid ICT
💰 Salary Not shared 📊 Market 5,500 EUR–8,000 EUR/mo

About the Company

Reaktor's tech community is looking for an experienced Senior Fullstack Developer to join one of our Business Units in Amsterdam. If you are comfortable working across modern web applications, backend services and production systems, enjoy solving ambiguous problems with clients, and are curious to work in a low-hierarchy environment, you might just be what we're looking for.

Responsibilities

  • ● domains. The exact client context may vary from focused product teams to large international companies working on high-traffic, business-critical services.
  • ● Many of our clients are technically mature and expect a high level of expertise from our consultants. This means you will need to be hands-on, pragmatic and comfortable helping both the client and the team make good technical decisions.
  • ● YOUR DAILY TASKS MAY INCLUDE:
  • ● Building and improving modern web applications, backend services, APIs and data models
  • ● Working across frontend, backend and infrastructure depending on the needs of the client project
  • ● Helping clients choose suitable technologies, architecture and delivery approaches
  • ● Contributing to cloud environments, CI/CD pipelines, deployments and production operations
  • ● Debugging, testing, monitoring and improving production-grade systems
  • ● Working on products or tooling related to customer-facing services, internal platforms, identity, martech, customer support, analytics, content, online stores, integrations, developer tooling or SDKs
  • ● Collaborating directly with client tech teams, business stakeholders, designers, product people and other disciplines
  • ● Clarifying ambiguous requirements and turning them into working software
  • ● Taking responsibility for delivery while making sure the team is supported and no one is left behind
  • ● Using modern development practices, including openness to AI-assisted development tools and workflows
  • ● TO THRIVE IN THIS POSITION, YOU'LL NEED:
  • ● Strong experience in modern frontend development, for example with TypeScript and React or comparable technologies
  • ● Strong experience in backend service development, for example with Node.js, Java, Kotlin, Python or comparable technologies
  • ● Comfortable working across the full delivery lifecycle, from implementation to testing, deployment and production operations
  • ● Understanding of cloud environments, CI/CD, deployments and how production systems are operated
  • ● Ability to work directly with clients, stakeholders and other disciplines in a senior, consultative role
  • ● Strong problem-solving skills and the ability to bring clarity to ambiguous product or technical situations