Staff Fullstack Engineer

Skills

About the Role

You will architect and own end-to-end delivery of DeFi products, working from React/Next.js frontends through GraphQL and REST APIs to blockchain data indexers. You will design and implement API and SDK strategies, build and optimize high-performance data systems processing on-chain events across multiple blockchains, and lead architecture reviews. You will establish coding standards, drive reliability through observability and incident response using OpenTelemetry, Grafana, and Sentry, and ship major product initiatives from scoping to production.

Requirements

• 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, including React/Next.js, GraphQL (Apollo Server), and Node.js
• Experience with 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
• Strong ownership mindset and ability to drive things to completion
• Clear, crisp asynchronous communication and ability to explain complex technical decisions simply
• Team-first approach and humility

Responsibilities

• Architect and own end-to-end delivery of DeFi products from frontends through APIs to blockchain data indexers, ensuring sub-second response times
• Design and implement API and SDK strategy, 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
• Lead technical architecture reviews and establish coding standards to raise engineering capability across product teams
• Own observability and incident response across the stack using OpenTelemetry, Grafana, and Sentry

Benefits

• Real flexibility
• Time together in Paris
• Great health coverage
• Support to keep learning