Senior Backend Engineer – Finapps/Access

Fireblocks
Warsaw, Czech Republic, Israel, Poland, Serbia
Workplace: OnsiteFull timePLN 300,000 - 3,800,000 annuallyFunction: Software EngineeringExperience: 7+ yearsEducation: bachelorsSkills: ["Systems thinking","Reliability focus","Security mindset","Ownership","Collaboration"]

Build and scale backend services for high-volume on-chain transaction flows across EVM and non-EVM networks. Own end-to-end backend components and APIs, lead integrations with DeFi protocols and blockchain nodes, and optimize production systems for performance, reliability, and security. Work with product, protocol research, and platform engineering teams to deliver mission-critical access infrastructure, while researching emerging blockchain technologies to keep the platform at the cutting edge.

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Fireblocks
Fireblocks
2 weeks ago

Senior Backend Engineer – Finapps/Access

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Source: Company careers pageValidated by: Fursa AI
Last checked: 4 hours agoStatus: Live
Reposted: similar role first listed 2 weeks ago

Job Summary

Build and scale backend services for high-volume on-chain transaction flows across EVM and non-EVM networks. Own end-to-end backend components and APIs, lead integrations with DeFi protocols and blockchain nodes, and optimize production systems for performance, reliability, and security. Work with product, protocol research, and platform engineering teams to deliver mission-critical access infrastructure, while researching emerging blockchain technologies to keep the platform at the cutting edge.
Location: Warsaw, Czech Republic, Israel, Poland, Serbia
Workplace: Onsite
Employment Type: Full time
Job Function: Software Engineering
Seniority: Mid level

Key Responsibilities

  • •Design and build robust, scalable backend services for high-volume on-chain transaction flows across EVM and non-EVM networks.
  • •Own end-to-end development of backend components and APIs, from architecture decisions through production deployment.
  • •Lead integrations with DeFi protocols, on-chain data sources, and blockchain nodes across multiple chains and ecosystems.
  • •Research and evaluate emerging blockchain technologies, protocols, and standards to keep the platform current.
  • •Optimize production systems for performance, reliability, and security, reducing latency and increasing throughput.

Pay and Benefits

Salary: PLN 300,000 - 3,800,000 annually
Equity and Bonus:Equity

Key Requirements

  • •7+ years of experience as a Backend or Full Stack Engineer.
  • •B.Sc. (or equivalent degree/experience).
  • •Must have blockchain/Web3 experience, including transaction lifecycles, consensus mechanisms, smart contract interactions, and on-chain data.
  • •Experience across multiple blockchain ecosystems, including EVM-compatible chains (Ethereum, Polygon, Arbitrum, Base) and non-EVM chains (e.g., Solana, TON, Tron).
  • •Proficiency in Node.js and TypeScript, plus experience designing and operating microservices in production CI/CD environments.
Experience:7+ yearsBlockchainWeb3DeFi
Education:Bachelor's
Skills:Systems thinkingReliability focusSecurity mindsetOwnershipCollaboration
Languages:English
Tech Stack:Node.jsTypeScriptMicroservicesCI/CDEVMEthereumPolygonArbitrumBaseSolanaTONTronEthers.jsViemWeb3.jsSolana web3.jsDeFiOn-chain data indexing

Company Brief

Fireblocks
Provides institutional-grade digital asset custody, transfer, and settlement infrastructure enabling banks, exchanges, and enterprises to securely issue, store, and move cryptocurrencies and tokenized assets.
Industry: Fintech Infrastructure
Company Size: Large (251 to 1,000 employees)
Growth: Scaleup
Valuation: Unicorn (USD 1B+)
Funding: Series E+
Headquarters: New York, United States
Founded: 2018
WebsiteLinkedIn