Twin Labs
Founding Rust Engineer
Location: Remote / Hybrid (Paris or Remote - Europe) Employment Type: Full time Department: Engineering
Compensation
Package €200K – €250K • Offers Equity
About Twin
Twin is building fully autonomous AI agents that run real business operations. You give a goal. Twin figures out the steps. It executes them end-to-end through APIs when they exist and through the browser when they don't.
In the first months of beta, users have already deployed more than 100,000 agents running lead generation, customer support, operations, trading systems, e-commerce workflows, reporting, and entire service businesses.
Twin was founded by Hugo Mercier, CEO (founder of Dreem, $60M raised, 150+ employees, acquired) and João Justi, CTO (cryptography, compilers, virtual machines, distributed systems, ex-Zama) but also Julius de Bruijn, creator of Tiberius (3.3M downloads) and Patrick Tourniaire.
We raised a $10M seed round led by LocalGlobe and are building with a small team of senior engineers.
Why join Twin?
- Work on one of the hardest problems in software: making AI agents reliable enough to run real businesses.
- Build from first principles: many of the core abstractions don't exist yet.
- Small team, massive ownership: your decisions directly shape the product, architecture, and company.
- Rust at the core, product at the center: not infrastructure for infrastructure's sake.
- Design systems for both humans and AI agents: a new software paradigm that barely exists today.
- Early enough to matter: every engineer has outsized impact on what Twin becomes.
What you'll work on
Most AI companies are focused on generating text or code. We are focused on making AI systems reliably execute real work.
You will work on some of the hardest problems in autonomous agents:
- Browser execution at scale
- Low-latency communication between agent subsystems
- Reliable orchestration of long-running workflows
- Memory systems that improve over time
- Self-healing execution architectures
- Agent infrastructure that survives failures
- Product features used directly by customers
- Internal systems that AI coding agents can understand, operate and extend
What we're looking for
We're not looking for a "Rust developer". We're looking for engineers who can own problems from idea to production.
You should probably have:
- Significant production Rust experience
- Strong systems thinking
- Experience building and operating real products
- High autonomy
- Ability to navigate ambiguity
- Interest in AI systems and LLMs
- Curiosity across the entire stack
You may come from:
- Infrastructure
- Databases
- Distributed systems
- Developer tools
- Browsers
- Networking
- Compilers
- Runtime systems
- AI infrastructure
