Senior Full-Stack Engineer (AI-First) (w/m/d)

TwinCloud builds AI-powered software that helps Germany's 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 Fraunhofer's Deep Tech Venture Lab, we closed our first funding round in March and already have paying customers and pilot projects with several of Germany's largest housing companies. We're a team of seven on a strong growth path.

We're looking for a senior full-stack engineer who works AI-first without sacrificing engineering quality. You'll 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 you'd 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 don't we do it like this?"

Requirements

5+ years building production software full-stack (strong candidates with 3–4 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

Master's 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 Germany's 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 you've built, a repo, a product, a war story. No cover letter needed. Start date: as soon as possible.

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