Senior Blockchain Engineer

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