Web3 Payments Protocol Engineer

Swiss Nexus; New York (NY); On-site; USD 140,000 - 210,000; Full time

Job summary

Swiss Nexus is seeking a Protocol Engineer to help develop the foundations of its Web3 payments infrastructure. This role sits at the intersection of smart contracts, cross‑chain protocols, DeFi and payment settlement, delivering high‑impact results.

You will design and implement secure onchain systems across multiple networks, collaborating with backend engineers and product stakeholders to translate business requirements into robust protocol architectures.

Qualifications

• Production smart contracts on Ethereum and L2 networks.
• Strong Solidity expertise with proven deployment experience.
• DeFi protocol knowledge and cross-chain concepts.
• Security-minded development and vulnerability awareness.
• Ability to translate product requirements into protocol design.

Responsibilities

• Design, develop and deploy secure smart contracts and protocol components across multiple blockchain platforms.
• Architect onchain payment and settlement infrastructure in collaboration with backend and product teams.
• Translate product and business requirements into robust protocol designs.
• Write efficient, well-tested smart contract code.
• Participate in internal and external security reviews.
• Research and assess new blockchain networks, DeFi primitives and interoperability protocols.
• Support incident response, debugging and remediation of onchain issues.
• Contribute to technical decisions affecting protocol security, scalability and reliability.

Skills

Solidity

Cross-chain protocols

Security mindset

Team collaboration

Tools

Foundry

Echidna

Rust/Move familiarity

Job description

Swiss Nexus is seeking a Protocol Engineer to help develop the foundations of its Web3 payments infrastructure. This role sits at the intersection of smart contracts, cross‑chain protocols, DeFi and payment settlement, delivering high‑impact results.

You will design and implement secure onchain systems across multiple networks, collaborating with backend engineers and product stakeholders to translate business requirements into robust protocol architectures.