Senior Backend Engineer – Finapps/Access

Join Fireblocks as a Senior Backend Engineer to build robust backend services for digital asset transactions. Work at the intersection of blockchain and enterprise reliability, impacting billions in decentralized finance. Fireblocks is on a mission to enable every business to easily and securely access digital assets and cryptocurrencies. As a leading provider in the digital asset space, we are committed to fostering a diverse and inclusive workforce that mirrors the global clientele we serve.

• •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.

• •Work at the frontier of blockchain infrastructure, with real impact on how DeFi scales for institutional and retail users.
• •Tackle genuinely hard engineering problems — multi-chain routing, on-chain data indexing, protocol integrations, and more.
• •Collaborate with world-class engineers, protocol researchers, and product minds in a fast-growing global company.
• •Competitive compensation, meaningful equity, and a culture that rewards ownership and initiative.
• •For employees hired to work from Serbia, the estimated compensation range for this role is EUR 60,000 – 80,000 gross annually. The base salary is one component of the total compensation package, which for some roles may include a target bonus, a very competitive equity grant, and very generous benefits.

• •7+ years of experience as a Backend or Full Stack Engineer.
• •Bachelor of Science (B.Sc.) or equivalent degree/experience.
• •Blockchain and Web3 experience are a must — 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.