Full-stack tool engineer (senior)

You’re an experienced software engineer with a passion for developer tools, programming languages, and the open source world. You’ve seen plenty of projects come and go — but what you’re looking for now is meaningful work that aligns with your interests and expertise.

At TypeFox, we’re the minds behind frameworks like Theia, Langium, and Sprotty — tools used and trusted worldwide. As a senior tool engineer, you’ll have the opportunity to shape the future of development tools: from custom IDEs and domain-specific languages to powerful visualizations and collaboration platforms.

This is a chance to do pioneering work in an environment where your contributions matter, your voice is heard, and you can dedicate time to open source. We’re a small, highly specialized team, working mostly remotely, with a culture built on trust, flexibility, and technical excellence.

What you will do

• Take a leading role in projects involving Theia, Langium, Sprotty, Open Collaboration Tools, and other cutting-edge open source frameworks
• Work closely with our customers to design and implement tailored solutions that solve real-world challenges
• Actively contribute to and shape the direction of our open source projects — from architecture to community discussions
• Represent TypeFox in the open source community through contributions, talks, and workshops
• Collaborate in a remote-first setting, balancing autonomy with teamwork in a culture that values trust and async collaboration

What you should bring

• Solid professional experience in frontend development with frameworks like React, Angular, or Vue
• Proficiency in backend development with Node.js (Express / Koa) or other frameworks
• Strong knowledge of the web platform, including JavaScript, HTML, CSS, and HTTP
• A genuine interest in developer tooling, programming languages, and open source communities
• Fluent writing and speaking in English
• Permission to work in Germany

• A track record of open source contributions (GitHub / GitLab profile)
• Experience with parser / compiler technology
• Proven experience designing or building developer tools
• Insights into building AI-based features (prompt engineering, fine-tuning, etc.)

What we offer

• Full-time/part-time employment with flexible working hours
• The chance to spend at least 20% of your time on open source projects
• Autonomy, trust, and a team of passionate experts to exchange ideas with
• Work from our office in Kiel or remotely (in Germany)
• Balanced workload and a relaxed working atmosphere
• Fund-based pension plan and private add-on health insurance