Senior Blockchain Engineer

Embedded Shishya; New York (NY); Hybrid; USD 150,000 - 210,000; Full time

Job summary

MoonPay is seeking a backend/infra engineer to scale transaction infrastructure and cross-chain flows. You will design high-volume broadcasting pipelines, manage transaction lifecycles, and improve reliability in a production blockchain environment.

You have hands-on experience with live networks (ETH, Bitcoin, Solana), understand MEV and pricing impact, and can build resilient systems with auditability. This role requires ownership, incident response, and collaboration with product managers.

Qualifications

• Strong backend and 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.

Responsibilities

• Design and improve high-volume transaction broadcasting pipelines.
• Manage transaction lifecycle across systems and chains.
• Detect, retry, rebroadcast, and safely recover stuck transactions.
• Contribute to wallet infrastructure and automation systems.
• Build infrastructure for cross-chain and multi-step flows.
• Design state machines and recovery strategies for partial failures.
• Improve monitoring, observability, and operational guardrails.
• Participate in incident response and post-mortems.
• Develop and maintain thoroughly tested, high-quality, performant code.

Skills

Strong backend fundamentals

Production systems uptime

Failure mode thinking

Incident response experience

Tools

Ethereum

Bitcoin

Solana

Job description

About MoonPay

MoonPay is for builders with something to prove. This isn't a \"work on cool crypto stuff\" company. It's a high-standards, high-velocity, high-accountability company building the operating system for value movement. If the internet moves information, we move value: crypto, stablecoins, tokenized assets, and whatever comes next. Four offerings make that real: fund, tokenize, trade, and spend. 30M+ customers and 500+ ecosystem partners run on us. Licensed in the U.S. Regulated across the UK, EU, Canada, and Australia. AI is the default operating mode here. It's woven into every role, and we expect you to use it daily. It handles the manual work so you can deliver on what actually matters. You'll thrive here if outcomes excite you more than process, if impact motivates you more than titles, and if you want hard problems, real ownership, and teammates who love winning, building, and doing it together. The bar is high. The pace is real. We're building for what's next, for humans and agents. Recent recognition: Forbes' America's Best Startup Employers 2026 . 2nd in Crypto Services on Fortune's inaugural Crypto 100, The Sunday Times Best Places to Work two years running. Research has shown that women are less likely than men to apply for this role if they do not have experience in 100% of these areas. Please know that this list is indicative, and that we would still love to hear from you even if you feel that you are only a 75% match. Skills can be learned, diversity cannot.

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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 and 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

Salary Bands: $150,000 - $210,000