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
