Web3 Protocol Engineer: Payments Infrastructure

Voiceflow; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Fun is building the financial infrastructure for internet capital markets. We’re seeking a Protocol Engineer to join our core blockchain team and help design secure smart contracts and cross-chain integrations that power millions of transactions.

You will work with backend and product teams to deliver scalable DeFi primitives, participate in security audits, and evaluate new blockchain technologies. A strong background in Solidity, Rust, and cryptography is required.

Qualifications

• Strong experience building and deploying production smart contracts on major blockchain platforms.
• Deep understanding of blockchain architecture, consensus mechanisms, and cryptographic principles.
• Hands-on experience with smart contract development languages (Solidity, Rust, Move, etc.).
• Solid grasp of DeFi protocols, token standards, and cross-chain communication patterns.
• Strong security mindset with knowledge of common smart contract vulnerabilities and best practices.
• Clear communicator who can explain complex blockchain concepts to cross-functional teams.

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

Solidity

Rust

Move

DeFi protocols

Cross-chain

Security mindset

Communication

Job description

Fun is building the financial infrastructure for internet capital markets. We’re seeking a Protocol Engineer to join our core blockchain team and help design secure smart contracts and cross-chain integrations that power millions of transactions.

You will work with backend and product teams to deliver scalable DeFi primitives, participate in security audits, and evaluate new blockchain technologies. A strong background in Solidity, Rust, and cryptography is required.