Senior Blockchain Engineer

Own the payment transaction domain, design signing pipeline architecture, define production readiness standards, lead incident response, maintain payment integrity controls, extend Solidity smart contracts, manage custody authorization integrations, implement audit trails, drive asynchronous transaction queue design, and mentor engineers.

Responsibilities

• Own the end-to-end transaction lifecycle
• Design the signing pipeline architecture
• Write RFCs for the signing pipeline
• Define production readiness standards
• Lead incident response and root-cause analysis
• Build payment integrity controls
• Extend and harden Solidity smart contracts
• Maintain custody authorization policy integration
• Maintain the co-signer agent
• Implement structured audit trails
• Drive asynchronous transaction queue design
• Mentor engineers
• Advise on EVM transaction mechanics and custody integration
• Assess scope and timeline risks

Requirements

• 5–7 years of backend software engineering experience
• At least 3 years working directly on EVM-compatible blockchain systems
• TypeScript
• Effect or a comparable functional effect system
• EVM transaction mechanics
• ABI encoding
• Nonce management
• Gas estimation
• Revert handling
• Event decoding
• Solidity smart contract development
• Upgradeable proxy patterns
• OpenZeppelin contract libraries
• Institutional custody APIs
• Key management APIs
• MPC signing infrastructure
• Idempotency
• At-least-once delivery
• Crash recovery
• Reconciliation
• Async transaction systems
• Independent domain ownership
• Technical design documentation

Benefits

• Medical insurance
• Vision insurance
• Dental insurance
• 401(k) matching program
• Flexible vacation policy
• Remote-first work environment
• Equity