Tech Lead Full-Stack Engineer

As the Tech Lead for the backend, frontend, mobile and fullstack software engineers, you will own and shape the architecture of the underlying services as well as their technical roadmap for the services that together create Treeline, our application that helps predict and prevent wildfires, storm events and generally power and train outages due to vegetation, weather and climate.

What you'll do

• Lead, support and coordinate the team that builds Treeline while still being around 60% hands-on
• Architect, build and extend features end-to-end that handle large volumes of geospatial data, with attention to UX and design
• Design and build well-designed, performant API endpoints and backend services used by partners and customers
• Coordinate tightly with other functions in cross-functional temporary squads
• Shape and influence how your team works and how we work together in a greater context

What you'll need

• First experience as a techlead, knowing that the team and product takes priority over your own hands-on work, always
• Strong Backend experience with NestJS, Express, or Node.js
• High level of TypeScript, React in production (Vue or Preact also fine)
• Familiarity with mobile development, especially React Native
• Experience working in a codebase with CI/CD and code review
• You've used AI-assisted coding in your actual day-to-day, not just tried it once

Nice to have

• Spec-driven or test-driven development, agentic or otherwise
• Web-based geospatial / GIS work
• An eye for design and UX — enough to make small design calls without needing a mockup for everything

What they offer

• Flexible working hours and hybrid work model
• Employee-driven career development with freedom to be creative
• Not an overtime culture — overtime offset with time off and rest
• Collaborative learning environment with workshops, knowledge sharing, and hackathons
• Office in Berlin Kreuzberg with free fruit, nuts and drinks
• Employee stock option program, Urban Sports membership, BVG subsidy, and corporate pension