Founding Rust Engineer

Paris or Remote (Europe)

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.

This is not another chatbot.
This is not another workflow builder.

We are building systems that can operate companies.

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 byHugo Mercier , CEO (founder of Dreem, $60M raised, 150+ employees, acquired) andJoão Justi, CTO (cryptography, compilers, virtual machines, distributed systems, ex-Zama) but alsoJulius de Bruijn, creator of Tiberius (3.3M downloads) andPatrick 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

Part of the challenge is not simply writing software.

The challenge is designing systems that remain understandable and modifiable by AI coding agents themselves. The way we build software internally increasingly assumes that both humans and coding agents will interact with the codebase.

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

What matters most is your ability to build robust systems and make good product decisions.

What tends to work well here

The engineers who thrive at Twin usually:

Ship fast
Take ownership without waiting for permission
Care deeply about product outcomes
Prefer building over discussing
Enjoy working close to users
Can move between infrastructure and product work

Many of the strongest engineers we know have backgrounds as founders, open-source maintainers, systems engineers, or product-minded infrastructure builders.

What won't work

This role is probably not for you if:

You need detailed specifications before starting
You prefer working on isolated technical components
You only want to work on backend infrastructure
You are uncomfortable making product decisions
You dislike ambiguity
You expect large-company processes

Examples of backgrounds we find exciting

Engineers who built widely-used open-source infrastructure
Early engineers from highly technical startups
Systems engineers who became product builders
Founders who built technical products from scratch
Developers who combine deep technical expertise with strong product intuition

Compensation

Package 200 - 250 K

We're building for the long term and want people who think like owners.

Last words

The software industry spent the last decade building SaaS.

The next decade will be about autonomous companies.

We believe AI agents will not just assist people.

They will operate businesses.

If that future sounds inevitable to you, we'd love to talk.

Twin So remote jobs

Product Engineer

Founding Rust Engineer

Research Engineering Internship