Senior Fullstack Developer (m/w/d)

LifeTeachUs gGmbH is hiring a hands-on Senior Fullstack Developer to take technical ownership of its core education platform, which is already used by schools across Germany. The role spans frontend, mobile and backend, covering React, React Native and TypeScript on a modern serverless AWS architecture with Lambda, DynamoDB and Cognito. You will make architectural decisions, keep the codebase clean and scalable, and integrate AI Agents and LLM-based workflows into the product. The position is hybrid in Berlin with at least three days per week in the office and requires good German at B2 level or above.