Staff Fullstack Engineer

ABOUT the company

The company is a leading Decentralized Finance (DeFi) lending protocol backed by a16z crypto, Paradigm, Ribbit Capital, Apollo, Vaneck, Coinbase Ventures, Variant and 50 others to build an open credit network giving anyone, anywhere, access to the best possible terms. The company is experiencing exponential adoption, with over billion in deposits on the network and used by institutional clients including Bitwise, Galaxy, and Anchorage Digital and the largest crypto exchanges, such as Coinbase, Binance, and Kraken. Now, the company is scaling its team of contributors to establish itself as the open credit network, not just of DeFi, but of the world.

WHY the company EXISTS

Everyone has the potential to build something great for the world. But fulfilling that ambition almost always requires more: people willing to trust you with their capital. Yet access to capital still depends on where you live, who you know, and which institutions are willing to trust you. Even when capital is available, it sits fragmented across disconnected networks and hidden behind intermediaries. The result is a system that fails most of the people it should serve. Borrowers overpay. Lenders earn less than they should. Many are shut out entirely, not because they are unworthy of credit, but because today's infrastructure was never built to connect them. The company exists to solve this. Full article here [link for members]

LOCATION

Paris or remote (from -5h GMT up to +2h GMT to ensure sufficient overlap with the rest of the team).

HOW WE WORK

We move fast on hard problems in a nascent market with no set playbook: navigating uncertainty is part of the job. You'll be challenged: anyone can question work and decisions must be justified. We keep a high bar and match it with high support: we help each other unblock and share context openly, with low ego. More about our values: the company [link for members]

ROLE

The mission of this role is to own the technical architecture and end-to-end delivery of the company's product suite, spanning React frontends, GraphQL APIs, and on-chain data systems, ensuring the platform scales reliably as the company grows beyond $10B in TVL, while actively raising the technical bar across the engineering team.

RESPONSIBILITIES

• Architect and own end-to-end delivery of DeFi products with billions in TVL, from React/Next.js frontends through GraphQL/REST APIs to blockchain data indexers, ensuring sub-second response times for users.

• Design and implement the API and SDK strategy enabling hundreds of integrators to build on the company's infrastructure, including versioning patterns, developer experience standards, and real-time streaming systems.

• Build and optimize high-performance data systems processing millions of on-chain events across 15+ blockchains, using intelligent caching and query optimization to maintain reliability at scale.

• Lead technical architecture reviews and establish coding standards that raise the technical capability of 5-10 engineers across product teams.

• Own observability and incident response across the stack, using OpenTelemetry, Grafana, and Sentry to ensure reliability for users and integrators.

WHAT SUCCESS LOOKS LIKE

FIRST 30 DAYS

Shipped a high-impact feature end-to-end that demonstrates competency across the full stack. Completed an architecture review of current systems and proposed a modernization roadmap. Built working relationships with key stakeholders across product, protocol, and business teams.

FIRST 4 MONTHS

Leading delivery of a major product initiative from scoping to production. Driving measurable improvements to API p95 latency through caching, query optimization, and architectural changes.

IN 1 YEAR

Owns technical architecture for an entire product vertical, with proven reliability and performance metrics. Recognized as the technical authority for fullstack architecture decisions across the organization.

MUST-HAVE EXPERIENCE & SKILLS

• 8-10+ years building fullstack applications at scale, with demonstrated impact on business metrics.

• Proven track record architecting high-availability systems handling millions of requests daily.

• Deep TypeScript expertise across client and server: React/Next.js, GraphQL (Apollo Server), Node.js, and typed contract interactions (viem).

• Hands-on experience building or maintaining on-chain data indexers (Ponder, Subsquid, or similar) and working knowledge of EVM event structures.

• Track record of leading technical initiatives across multiple teams without direct authority.

• Comfort operating in fast-changing, ambiguous environments without needing a defined playbook.

• Strong ownership mindset: you drive things to completion and don't wait to be asked.

• Clear, crisp async communication: you write well and can explain complex technical decisions simply.

• Team-first approach: you make the engineers around you better, not just the codebase.

• Humble.

PERKS & BENEFITS

We design benefits around deep work and growth, so you can do the best work of your career. Expect fair, top-tier compensation, real flexibility, time together in Paris, great health coverage, and support to keep learning.

EQUAL OPPORTUNITY

We welcome applicants from all backgrounds and hire based on talent, potential, and values alignment.