Web3 Protocol Engineer: Secure Cross-Chain & Smart Contracts

Fun; New York (NY); On-site; USD 140,000 - 190,000; Full time

Job summary

Fun is building the foundation of Web3 payments infrastructure. We are looking for a Protocol Engineer to design and implement secure smart contracts and cross‑chain integrations powering millions of transactions.

You will collaborate with backend and product teams to architect scalable blockchain solutions, research new protocols, and contribute to security audits to ensure protocol safety in a fast‑paced environment.

Qualifications

• Production experience deploying smart contracts on major blockchains.
• Understanding of blockchain architecture, consensus mechanisms, and cryptographic principles.
• Hands-on experience with smart contract languages (Solidity, Rust, Move).

Responsibilities

• Design, develop, and deploy secure smart contracts and protocol implementations across multiple blockchain platforms
• Collaborate with backend and product teams to architect blockchain solutions meeting business requirements
• Write highly efficient, well-tested code and participate in security audits to ensure protocol safety
• Research and evaluate new blockchain technologies, protocols, and DeFi primitives for integration opportunities
• Contribute to incident response and debugging on-chain issues to ensure protocol reliability

Skills

Smart contract development

Blockchain architecture

Cross-chain protocols

Security mindset

Clear communicator

Tools

Solidity

Rust

Move

Job description

Fun is building the foundation of Web3 payments infrastructure. We are looking for a Protocol Engineer to design and implement secure smart contracts and cross‑chain integrations powering millions of transactions.

You will collaborate with backend and product teams to architect scalable blockchain solutions, research new protocols, and contribute to security audits to ensure protocol safety in a fast‑paced environment.