Senior .Net Full Stack Developer

Openup

Amsterdam, Netherlands Posted October 29, 2026

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On-site Full-time Senior
Job Description

Join OpenUp, a mental health platform, as a Senior .Net Full Stack Developer. You will be a key member of our tech and product team, writing clean code, mentoring team members, making architectural decisions, and collaborating with third parties. Our tech stack includes .NET 10, SQL Server, React, and Azure. Enjoy benefits such as daily healthy lunch, access to mindfulness courses, and a supportive work environment.

  • Schreiben von sauberem und praktischem Code, Mentoring anderer Teammitglieder und Treffen von wichtigen Architekturentscheidungen.
  • Zusammenarbeit mit dem technischen Team zur Entwicklung der Plattform für psychische Gesundheit.
  • Beitrag zu innovativen Projekten und Entwicklung kreativer, pragmatischer Lösungen für komplexe Probleme.
  • OpenUp loves people. We hope you do too. You enjoy working with people and you like to work in a team. You are enthusiastic about mental health, which is a topic as normal as going to the gym. Your motto is: you can learn from setbacks and you should celebrate success! Next to that:
  • You have knowledge of application design, architecture and common design patterns
  • You like to come up with creative yet pragmatic solutions to complex problems
  • You have experience with devops
  • You have knowledge of unit/integration/E2E testing
  • You are an experienced software developer with a strong track record in contributing to innovative projects
  • You get positive energy from the dynamics of a scale-up environment
  • You communicate well and enjoy mentoring more junior colleagues
  • You have 2+ years experience working with React /Angular/Vue
  • Experience with Tailwind/shadcn and Storybook is a plus
  • You have 5+ years experience working with backend APIs on .Net
  • You have a bachelor's degree in computer science or a similar education
Required Skills
.NET mentoring collaboration SQL MS SQL Server React Azure design patterns DevOps testing software development Angular Vue Tailwind
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