Senior Blockchain Engineer

MoonPay•New York, NY

2d•$150,000 - $210,000•Hybrid

About The Position

MoonPay is a high-standards, high-velocity, high-accountability company building the operating system for value movement. We move value: crypto, stablecoins, tokenized assets, and whatever comes next through four offerings: fund, tokenize, trade, and spend. We serve over 30 million customers and 500+ ecosystem partners, and are licensed in the U.S. and regulated across the UK, EU, Canada, and Australia. AI is the default operating mode, woven into every role, and we expect you to use it daily to handle manual work so you can deliver on what 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, and we're building for what's next, for humans and agents. Recent recognition includes Forbes' America's Best Startup Employers 2026 and being 2nd in Crypto Services on Fortune's inaugural Crypto 100, and 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.

Requirements

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

Nice To Haves

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
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

Responsibilities

Design and improve high-volume transaction broadcasting pipelines
Manage transaction lifecycle
Detect, retry, rebroadcast, and safely recover stuck transactions
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
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
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

Benefits

Competitive salary package
Equity package: financial freedom starts with our employees, so all employees have ownership at MoonPay
Pay-for-performance equity bonus: those who drive outsized outcomes receive outsized rewards
Moonshot award: we honor exceptional impact. 10 employees twice a year, each earning a $250,000 equity grant
Pension: employer contributions from day one
Employee referral program: refer great people, earn 10K in USDC
Flexible Time Off: choose when to work and when to switch off
Birthday leave: take the day off to celebrate you
Enhanced parental leave: more time with family, no second thought
Hybrid working schedule: work fully remotely or from your nearest Moonbase
Commuter benefits: public transport to and from the office
Private healthcare benefits: to protect you and your loved ones
Wellhub wellness membership: access to gyms, studios, classes, and wellness apps in one membership
Unlimited enterprise access to the latest AI tools: Claude, ChatGPT, Gemini and whatever's next
Lunch credit: meals covered on the days you're in the office
Home office setup allowance: build the home office of your dreams
Remote working allowance: those working fully remotely get a little extra for utilities
Monthly product budget and zero-fee crypto transactions
$1,000 Annual training budget: we support your learning journey
High Potential Program: structured development, mentorship, and stretch opportunities
Regular remote company offsites: high-impact in-person sessions and hackathons
(Ireland) Cycle to Work scheme: tax-efficient bike, gear, and safety kit
(UK) EV Salary Sacrifice: lease an electric vehicle through pre-tax salary