Web3 Protocol Engineer — Cross-Chain Payments

Fun; Singapore; On-site; SGD 180,000 - 280,000; Full time

Job summary

Fun is building the foundational Web3 payments infrastructure. We are seeking a Protocol Engineer to design and implement secure smart contract systems and cross-chain integrations powering millions of transactions across multiple chains.

Join a fast-paced crypto startup focused on DeFi primitives, security audits, and scalable protocols. You will collaborate with backend and product teams, research new technologies, and contribute to high-impact blockchain solutions.

Qualifications

• Production smart contracts on major blockchain platforms.
• Deep understanding of blockchain architecture, consensus, and crypto basics.
• Experience with cross-chain communication patterns and DeFi primitives.
• Security-first mindset with knowledge of common smart contract vulnerabilities.
• Clear communicator able to explain complex concepts to non-technical teammates.

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 that meet 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 patterns

Security mindset

Technical communication

Tools

Solidity

Rust

Move

Job description

Fun is building the foundational Web3 payments infrastructure. We are seeking a Protocol Engineer to design and implement secure smart contract systems and cross-chain integrations powering millions of transactions across multiple chains.

Join a fast-paced crypto startup focused on DeFi primitives, security audits, and scalable protocols. You will collaborate with backend and product teams, research new technologies, and contribute to high-impact blockchain solutions.