Full Stack Engineer, Blockchain

You'll join a team building the backbone of on-chain access for some of the world's largest financial institutions and crypto-native organizations, working at the intersection of blockchain protocol engineering and enterprise-grade reliability. You will design systems that route, protect, and optimize transactions across dozens of chains at scale, and work on mission-critical infrastructure powering DeFi connectivity, multi-chain integrations, transaction execution pipelines, and on-chain data access. Your work will have a direct impact on how billions of dollars flow through decentralized networks every day.

Responsibilities

• 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

Requirements

• 7+ years of experience as a Backend or Full Stack Engineer
• Bachelor of Science (B.Sc.) or equivalent degree/experience
• Blockchain and Web3 experience including deep understanding of transaction lifecycles, consensus mechanisms, smart contract interactions, and on-chain data
• 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
• Proficiency in Node.js and TypeScript
• Experience designing and operating microservices in production CI/CD environments
• Strong understanding of security principles, cryptography, and best practices in a blockchain context
• Familiarity with DeFi protocols — AMMs, lending markets, bridging infrastructure, or on-chain routing — is a strong advantage
• Experience with Web3 tooling and libraries (ethers.js, viem, web3.js, Solana web3.js, etc.)
• Demonstrated experience taking products from inception to delivery at scale
• Full stack experience (React, frontend development) — a nice to have

Benefits

• Meaningful equity