Senior Blockchain Engineer

You will design and improve high-volume transaction broadcasting pipelines, manage transaction lifecycles, recover stuck transactions, and contribute to wallet infrastructure and automation. You will build cross-chain and DeFi integrations, design recovery strategies for partial failures, develop reliable off-chain services, and improve system reliability, monitoring, and resilience.

Responsibilities

• Design and improve high-volume transaction broadcasting pipelines
• Manage transaction lifecycles
• Detect, retry, rebroadcast, and recover stuck transactions
• Contribute to wallet infrastructure and automation systems
• Implement safe parallel transaction handling
• Improve monitoring, observability, and operational guardrails
• Design cross-chain and multi-step transaction flows
• Design state machines and recovery strategies for partial failures
• Build reliable off-chain services that interact with on-chain contracts
• Develop and maintain tested, high-quality, performant code
• Participate in incident response and post-mortems
• Improve reliability, alerting, and system resilience

Requirements

• Strong backend and platform engineering fundamentals
• Experience operating production systems with real uptime requirements
• Production experience interacting with live blockchain networks
• Understanding of transaction lifecycle and failure recovery in at least one blockchain
• Experience with wallet infrastructure or custody systems
• Awareness of MEV, slippage, pricing impact, and swap execution risks
• Experience with high-throughput or financial systems
• Familiarity with UTXO-based chains, coin selection, and fee bumping strategies
• Experience designing cross-chain or multi-step transaction orchestration systems
• Familiarity with blockchain indexing or event ingestion pipelines
• Understanding of ERC-20 and SPL token standards
• Experience interacting with smart contracts from backend services

Benefits

• Equity package
• Pay-for-performance equity bonus
• Pension with employer contributions
• Employee referral program with 10K USDC reward
• Flexible time off
• Birthday leave
• Enhanced parental leave
• Hybrid working schedule
• Commuter benefits
• Private healthcare benefits
• Wellhub wellness membership
• Unlimited enterprise access to AI tools
• Lunch credit
• Home office setup allowance
• Remote working allowance
• Monthly product budget
• Zero-fee crypto transactions
• $1,000 annual training budget
• High Potential Program with structured development and mentorship
• Regular remote company offsites
• Ireland Cycle to Work scheme
• UK EV Salary Sacrifice