Protocol Engineer

Dear applicants, please keep in mind that applications without provided salary expectations and active LN profile will not be considered. Hope for your understanding. ONSITE ROLE IN NY We are looking for a senior-level Protocol Engineer to join a core blockchain team building next-generation Web3 payments infrastructure. This role is focused on designing and implementing secure, efficient smart contracts and protocol-level components that power cross-chain value transfer at scale. You will operate at the intersection of smart contract development, DeFi mechanics, and blockchain architecture, contributing directly to systems that enable millions of onchain transactions. The position requires a strong crypto-native mindset, deep Solidity expertise, and the ability to reason about protocol design, security, and cross-chain interactions. You will collaborate closely with backend engineers and product teams to architect payment and settlement infrastructure. This is a high-impact opportunity within a growing blockchain team shaping core Web3 primitives. Details Location: Midtown NYC; visa sponsorship available Work Model: Onsite (NYC) Employment Type: Full-time Seniority Level: Senior (L1–L4) Industry: Blockchain / Web3 Payments Start Date: ASAP Key Responsibilities Design, develop, and deploy production-grade smart contracts across major blockchain platforms Architect secure protocol components for onchain payments and settlement systems Write highly efficient, well-tested Solidity code Collaborate with backend and product teams on cross-chain payment flows Research and evaluate new blockchain networks and interoperability approaches Contribute to cross-chain communication and bridging strategies Perform security reviews and proactively mitigate smart contract vulnerabilities Support incident response and debugging of onchain issues Requirements Proven experience building and deploying production smart contracts (Ethereum / L2s) Strong expertise in Solidity (required) Deep understanding of DeFi protocols, token standards, and onchain mechanics Solid knowledge of cross-chain communication patterns Strong security mindset and awareness of common smart contract vulnerabilities Ability to reason about protocol architecture and distributed system design Strong written and verbal communication skills Nice to Have Experience with Rust or Move Production experience across multiple blockchain ecosystems Familiarity with cross-chain bridges Experience with formal verification or advanced security tooling Deep understanding of blockchain architecture and consensus models Interview Process Recruiter screening (technical depth, location, compensation alignment) Technical deep dive with protocol lead / Solidity engineer Smart contract design and security assessment (live and/or take-home) Onsite in NYC including technical and cultural interviews