Founding AI Systems Engineer (Rust & Infra)

A Player; Cambridge; On-site; GBP 85,000 - 120,000; Full time

Job summary

Twin is the AI company builder. 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.

We’re a small team of repeat founders and senior engineers, based in Paris, building production-grade solutions and shipping features that scale. Cambridge presence expected for collaboration and growth.

Qualifications

• 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.

Responsibilities

• Own problems across the stack from Rust infrastructure to user-facing experiences.
• Contribute to design and architecture decisions for scalable systems.
• Build ultra-low latency browser automation and reliable execution engines.
• Develop fault-tolerant distributed systems that recover from failures.

Skills

Deep production Rust

Open source experience

Systems fundamentals

Ownership & shipping

AI coding assistants

Across stack curiosity

Tools

Git

CI/CD

Job description

Twin is the AI company builder. 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.

We’re a small team of repeat founders and senior engineers, based in Paris, building production-grade solutions and shipping features that scale. Cambridge presence expected for collaboration and growth.