Founding Engineer M/F/X - Build autonomous companies.

A Player

Heimarbeit

Twin is the AI company builder. Anyone can describe a business goal in plain English — our platform designs, builds and operates AI agents that execute work end-to-end, using APIs when they exist and browsers when they don't. Our agents don't just answer questions: they browse websites, call APIs, recover from failures, remember what matters, and become cheaper and more reliable over time. Over 70,000 businesses already run real workflows on Twin every day.

We're a small team of repeat founders and senior engineers based in Paris. We've raised a $10M Seed led by LocalGlobe and are building one of the most ambitious AI infrastructure companies in Europe.

Job Description

Most AI companies build copilots. We're building autonomous systems that run real businesses — and you'll build the core systems behind them. Your work will span the entire product, from low-level Rust infrastructure to user-facing experiences.

Typical Projects Include

Building ultra-low latency browser automation
Designing reliable execution engines for long-running autonomous tasks
Creating fault-tolerant distributed systems that recover automatically
Building memory systems that improve over time
Designing agent capabilities that thousands of users rely on every day
Shipping product features from idea to production

You'll own problems, not tickets.

Why join? You'll work on problems that don't have existing solutions, ship code that reaches production immediately, and help define both the product and the architecture, alongside engineers who care deeply about quality without sacrificing speed.

Profile / Requirements

We're looking for engineers who love building products as much as building systems. You likely have:

Deep production Rust experience
Experience building products in startups or open source
Strong systems fundamentals (concurrency, networking, performance, distributed systems)
Excellent product intuition, high ownership and a bias toward shipping
Heavy usage of AI coding assistants
Curiosity to work across the entire stack when necessary

You might be a great fit if you've built an open-source project people actually use, designed APIs developers enjoy, taken products from idea to production, talked directly to users, or optimized systems because performance mattered.

We care far more about what you've built than your years of experience.

We'd love to see

⁠ ⁠Open-source projects.
⁠ ⁠GitHub activity.
⁠ ⁠Technical writing.
⁠ ⁠Developer tools.
⁠ ⁠Systems software.
⁠ ⁠Products you've built from scratch.

Benefits

Our engineering culture: we optimize for ownership, speed and simplicity. Everyone ships, everyone talks to users, everyone helps shape the product. No feature factories, no handoffs, very few meetings.

AI-native engineering: we expect every engineer to use coding agents extensively, and we design our systems so they can be understood, extended and maintained by AI agents.

We'd love to see: open-source projects, GitHub activity, technical writing, developer tools, systems software, products you've built from scratch.