Rebind’s mission is to make modern finance simple, open, and self-custodial.

We’re building the most intuitive way to earn, manage, and move money — all powered by crypto rails, and accessible from a mobile app that feels like any great fintech product.

We're hiring a Senior Full Stack Engineer (Paris, hybrid) to help us build the backend that powers open finance for everyone, everywhere.

Why join

We're a lean team working hands-on from our office in Paris. You'll collaborate closely with the founders (design, mobile, engineering) to shape core flows from concept to production.

• Impact — Own foundational pieces of our backend and shape how we scale
• Excellence — Build with people who care about clarity, pace, and long-term maintainability
• Autonomy — Influence product direction directly, with end-to-end responsibility for what you ship

What you'll do

We're looking for an individual contributor who thrives in fast-paced environments, cares about product detail, and can own end-to-end backend responsibilities.

• Shape and scale our backend infrastructure. You’ll work with Typescript (Hono), Postgres, and QuestDB. You’ll define contracts (OpenAPI), build abstractions, and monitor for resilience.
• Power real financial activity. Design and maintain a blockchain indexing layer that tracks balances, onchain positions, yield performance and any events happening onchain for Rebind users — and exposes this data to the client via a clean API. Bonus if you have experience with Envio .
• Support critical user flows. Build secure transaction pipelines for smart account wallets (ERC-4337), manage wallet creation and key flows, and help maintain consistent performance across users and devices.
• Support DeFi flows. Integrate DeFi primitives, e.g. ERC-4626 vaults, into a unified interface, handling edge cases, chain abstraction, and transaction efficiency.
• Solve interesting technical problems. Bring your full creativity to solve challenging problems — from backend architecture and secure transaction flows to syncing state and enabling real-time UX.
• Think end-to-end. Collaborate with frontend engineers and designers to make sure backend decisions serve the product, not just the codebase.

What we're looking for

You're a senior engineer that has built such systems before and this is not an area you have to ramp up on. We don't require any formal qualifications but value learning new skills fast. We are looking for someone that feels a sense of duty to the users of their work.

• Ownership mindset. Takes full responsibility for outcomes, not just tasks. Follows through and holds the bar high.
• Fast learner with bias to action. Moves quickly, adapts fast, and improves with every cycle, even under uncertainty.