Note: The job is a remote job and is open to candidates in USA. MoonPay is a company building infrastructure for crypto, stablecoins, tokenized assets, and other forms of value movement. The Senior Blockchain Platform Engineer will design and operate scalable transaction infrastructure, wallet and lifecycle management systems, and cross-chain and DeFi integrations while owning reliable, tested, and performant backend systems.
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
Skills
- 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
- 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
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. 20 employees 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
- Recharge Period: end-of-year company-wide time off to rest and reset
- 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
- 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
Company Overview
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