Senior Full Stack Developer

Opusflow
Opusflow

Software Engineering · Full-time

Netherlands

EUR 80k-120k / year

Posted on Nov 6, 2026
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Vacancies

Senior Full Stack Developer

Are you a seasoned NodeJS, React, Typescript Developer ready for a key role? A role where you not only write complex code but also shape the architecture of our platform and become the technical backbone of our development team? Do you want to do this for a product that is accelerating the energy transition? Then you are the Senior Developer we are looking for.

Development

Senior Full Stack Developer

  • Netherlands
  • Full Time
  • €80.000 - €120.000

About the role

As our Senior Developer, you will be given significant responsibility and ownership from day one. You are the technical expert on all things and the right hand of our CTO, Joey. You will not only work on complex new features but also act as a sparring partner for the product team and a mentor for your fellow developers. Your mission is to elevate the quality, scalability, and performance of our codebase to the next level.
  • Develop and implement complex, high-quality features using React, Typescript, NodeJS, GraphQL, PostgreSQL.
  • Design and safeguard our long-term architecture.
  • Proactively contribute to the product roadmap and technical feasibility discussions.
  • Coach and mentor junior and medior developers through pair programming and code reviews.
  • Optimize the application for maximum speed and scalability.
  • Raise the bar for code quality, testing, and development best practices.

Key Responsabilities

What we offer

  • An excellent annual salary between €80,000 and €120,000, depending on your experience (this translates to a monthly gross salary of approx. €6,667 – €10,000, including holiday pay).
  • A high-end laptop (MacBook Pro or equivalent) and all the tools you need.
  • A flexible hybrid/remote work setup (we require you to be based in the Netherlands).
  • A generous budget for training, courses, and conferences.
  • Direct impact on a product that contributes to a more sustainable world.
  • An ambitious, international, and close-knit team where your input truly matters.
  • A minimum of 5+ years of professional experience as a Full-stack Developer, with a strong focus on React and NodeJS.
  • In-depth knowledge of TypeScript, HTML5, and CSS3.
  • Demonstrable experience in designing scalable, serverless, architectures.
  • Experience with coaching and mentoring other developers is a major must.
  • You are ‘product-minded’: you think beyond the technical ticket and consider the user’s perspective.
  • Fluency in English.

What you bring

What you'll work with

  • Front-end: React, TypeScript, Next.js
  • Testing: Jest, React Testing Library, Cypress
  • Back-end & Infra: Node.js, NestJS, PostgreSQL, AWS, Docker, Kubernetes
  • Tools: GitHub, Linear, Slack
  • You think in scalable solutions, not quick hacks.
  • You live and breathe ‘clean code’ and inspire others to do the same.
  • You have a passion for performance and a seamless user experience.
  • You want to sink your teeth into a complex product that has a positive impact on the world.

What makes you unique

How to apply

Like what you see?

Apply now
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