Senior Protocol Engineer

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