1w English ad, no German stated (Senior) Full-Stack Software Engineer (m/w/d) Berlin Full-time Senior 20° GmbH Strong Three.js/WebGL 3D graphics skills, fluency in React and TypeScript, Node/TypeScript backend with relational SQL, solid math and geometry, hands-on experience with AI-assisted development tools like Claude Code, and high … JavaScript, NestJS, React, TypeScript, PostgreSQL, OpenCV Details+ Track