Moonpay

Blockchain Engineer

Job Description

About the Opportunity

Our Engineering team builds the technology that empowers MoonPay to innovate rapidly and scale
efficiently. We thrive in small, collaborative cross-functional teams of 4-6 engineers, working closely with
a dedicated Product Manager and Product Data Analyst. MoonPay is seeking individuals with experience
in developing blockchain applications and integrations to contribute to our expanding consumer and B2B
initiatives. Our focus areas include self-custody wallets, DeFi Trading, on-chain asset delivery, and
innovating on what the future of Web3 means.


What You Will Do
  • Transaction Infrastructure at Scale:
  • Design and improve high-volume transaction broadcasting pipelines
  • Manage transaction lifecycle
  • Detect, retry, rebroadcast, and safely recover stuck transactions
  • Wallet & Lifecycle Management
  • Contribute to wallet infrastructure and automation systems
  • Implement safe parallel transaction handling
  • Improve monitoring, observability, and operational guardrails
  • Design systems with financial correctness, reconciliation and auditability in mind


  • Cross-Chain & DeFi Integrations:
  • Build infrastructure supporting cross-chain and multi-step flows (fiat to on-chain and vice versa)
  • Handle non-atomic multi-step journeys across chains
  • Design state machines and recovery strategies for partial failure scenarios
  • Support routing mechanics and swap execution considerations, such as price impact, liquidity changes, including MEV awareness
  • Build reliable off-chain services that interact with on-chain contracts


  • End-to-End Engineering Ownership:
  • Participate in estimation, planning, and execution of projects, features, and integrations
  • Develop and maintain thoroughly tested, high-quality, and performant code
  • Collaborate closely with Product Managers to design scalable implementation strategies
  • Contribute to reliable, maintainable systems that evolve with product needs
  • Participate in incident response and post-mortems
  • Improve reliability, alerting, and system resilience
  • Continuously evolve infrastructure to support growing volume and complexity


    • About You
  • Must-Have
  • Strong backend/platform engineering fundamentals
  • Experience operating production systems with real uptime requirements
  • Hands-on experience interacting with live blockchain networks in production
  • Clear understanding of transaction lifecycle in at least 1 Blockchain and failure recovery
  • You think in failure modes, not just happy paths


  • Strong Signals
  • You can explain a real production incident end-to-end
  • Experience with at least 1 wallet infrastructure (Eth, Bitcoin, Solana) or custody systems
  • Awareness of MEV, slippages, pricing impact and swap execution risks
  • Experience with high-throughput or financial systems


  • Bonus points
  • Experience working at exchanges, custody providers, wallet infrastructure teams, or high-volume DeFi platforms
  • Familiarity with UTXO-based chains (e.g., Bitcoin), including coin selection and fee bumping strategies (RBF / CPFP)
  • Experience designing cross-chain or multi-step transaction orchestration systems
  • Familiarity with blockchain indexing or event ingestion pipelines
  • Understanding of common token standards (ERC-20, SPL) and interacting with smart contracts from backend services


    • Apply Now
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