About the role
Join Bluesand as a Founding Engineer to build human-agent systems using reasoning models and semantic infrastructure — redefining how Finance runs inside every company.
What you'll do: • Model complex domain-specific systems with elegant backend architectures • Build autonomous Agents, integrating frontier methods to increase impact and reliability • Design and integrate new types of interfaces for human/agent collaboration • Build enterprise-grade systems balancing speed, trust, and scale • Own delivery end-to-end: from architecture to shipping with fast iteration cycles • Shape not just the product, but the company itself
Stack (evolving): TypeScript, Vercel AI SDK / Vercel, Neon / Postgres, Langsmith.
What we're looking for: • Significant experience building and shipping great products • Deep curiosity and ability to dive into customer domain, deriving first principles to solve complex engineering problems • Concrete understanding of system design, tech debt tradeoffs, and scalable architecture • Restless ambition — always pushing the frontier
Who you are: relentless ambition, pragmatic, bias for action. Thrive in complexity, think in first principles. Ask why until you fully understand. 'Now' beats 'tomorrow'. Multiplier — ego aside, share knowledge. North Star: customer outcomes.
What's in it for you: • Founding role at a company backed by leading VCs and top executives • Frontier tech in a talent-dense team • Founding employee package: competitive salary + good chunk of equity • Top Paris office, high-energy colleagues, health insurance, sports facilities, transportation allowance