Senior Full-Stack Engineer (AI-First) (wmd)

TwinCloud builds AI-powered software that helps Germanys largest real estate and housing companies decarbonize their buildings. Using computer vision and 3D Gaussian Splatting we turn ordinary camera footage into measurable digital twins with actionable insights making heating replacement and energy efficiency measures scalable across entire portfolios.

Founded in January 2026 and backed by Fraunhofers Deep Tech Venture Lab we closed our first funding round in March and already have paying customers and pilot projects with several of Germanys largest housing companies. Were a team of seven on a strong growth path.

Were looking for a senior full-stack engineer who works AI-first without sacrificing engineering quality. Youll work directly with the founders and shape core technical decisions from day one.

Tasks

• Build and ship features across our full stack: web frontend backend and occasionally our Flutter mobile app
• Drive our web stack forward: currently some vanilla JS/TS with a likely move to React that youd help evaluate and lead
• Design deploy and operate our cloud infrastructure (Azure Scaleway GPU compute)
• Run and scale the GPU-based computation pipelines that turn video into 3D models
• Own our backend and application architecture (Supabase/Postgres)
• Improve deployment monitoring and operational reliability
• Provide technical guidance to less experienced developers and working students
• Iterate rapidly on customer feedback and challenge our workflows: Not this is bad but why dont we do it like this

Requirements

• 5 years building production software full-stack (strong candidates with 34 years will also be considered)
• A hands-on coding background and now highly productive with AI tools like Claude Code.
• You read tickets understand code before changing it and know when to close the AI session and think
• Solid web development skills (JS/TS); experience with or strong interest in React
• Experience operating cloud infrastructure and compute-intensive workloads
• Strong Postgres/backend experience; hands-on Supabase experience is a big plus
• High ownership and an independent work style; you keep the architecture overview not just your own tickets
• Fluent English
• Masters degree in a relevant technical field or equivalent practical experience
• Nice to have: Flutter GPU workloads CI/CD ownership ML product experience German

Our stack: Flutter/Dart JS/TS Supabase (Postgres) Azure & Scaleway GPU compute GitLab VS Code Claude Code.

Benefits

• Competitive salary plus virtual shares (VSOP) real upside in a fast-growing deep-tech company
• Work directly with the founders and own meaningful technical decisions
• Build products used by Germanys largest housing companies with real climate impact
• A modern AI-first codebase with no legacy burden
• High autonomy and real responsibility during rapid growth
• Hybrid work from our Berlin office (near U Ernst-Reuter-Platz)

Send us a short note about yourself and something youve built a repo a product a war story. No cover letter needed. Start date: as soon as possible.