Full Stack Engineer (Blockchain)

• The FinApps Access team at Fireblocks builds the backbone of on-chain access for some of the world’s largest financial institutions and crypto-native organizations. We operate at the intersection of blockchain protocol engineering and enterprise-grade reliability — designing systems that route, protect, and optimize transactions across dozens of chains at scale
• You’ll work on mission-critical infrastructure powering DeFi connectivity, multi-chain integrations, transaction execution pipelines, and on-chain data access — with direct impact on how billions of dollars flow through decentralized networks every day
• Design and build robust, scalable backend services supporting high-volume on-chain transaction flows across multiple blockchain networks — both EVM and non-EVM
• Own end-to-end development of backend components and APIs — from architecture decisions to production deployment
• Lead integrations with DeFi protocols, on-chain data sources, and blockchain nodes across a wide range of chains and ecosystems
• Research and evaluate emerging blockchain technologies, protocols, and standards to keep Fireblocks at the cutting edge
• Optimize existing production systems for performance, reliability, and security — reducing latency and increasing throughput
• Collaborate closely with product, protocol research, and platform engineering teams to deliver high-quality solutions on time
• Drive features from inception through to delivery at scale, taking full ownership of the product lifecycle

Benefits

• Flexible vacation policy

• Strong understanding of security principles, cryptography, and best practices in a blockchain context
• Experience designing and operating microservices in production CI/CD environments
• Demonstrated experience taking products from inception to delivery at scale
• Full stack experience (React, frontend development) — a nice to have
• Proven experience working across multiple blockchain ecosystems — EVM-compatible chains (Ethereum, Polygon, Arbitrum, Base, etc.) as well as non-EVM chains such as Solana, TON, Tron, or similar
• Bachelor of Science (B.Sc.) or equivalent degree/experience
• Familiarity with DeFi protocols — AMMs, lending markets, bridging infrastructure, or on-chain routing — is a strong advantage
• Blockchain and Web3 experience are a must — including deep understanding of transaction lifecycles, consensus mechanisms, smart contract interactions, and on-chain data
• Proficiency in Node.js and TypeScript
• 7+ years of experience as a Backend or Full Stack Engineer
• Experience with Web3 tooling and libraries (ethers.js, viem, web3.js, Solana web3.js, etc.)
• You’re comfortable navigating ambiguity and can drive technical decisions with limited oversight
• You think in systems and care deeply about correctness, reliability, and scale
• You have a natural curiosity for how blockchain protocols work under the hood — and you actually read the specs
• You communicate clearly and collaborate effectively across engineering, product, and research
• You thrive in fast-moving environments and can balance shipping velocity with long-term code quality