Web3 Protocol Engineer – Cross-Chain Payments Infrastructure

Voiceflow; Singapore; On-site; SGD 180,000 - 240,000; Full time

Job summary

Fun is building Web3 payments infrastructure and seeks a Protocol Engineer to join the core blockchain team. Design and implement secure smart contract systems and cross‑chain integrations powering millions of transactions.

You will work with backend and product teams, review code, and evaluate new blockchain technologies, with a focus on security and reliability in fast-paced environments.

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 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.

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 contracts

Blockchain architecture

DeFi protocols

Cross-chain

Security mindset

Communication

Tools

Solidity

Rust

Move

Job description

Fun is building Web3 payments infrastructure and seeks a Protocol Engineer to join the core blockchain team. Design and implement secure smart contract systems and cross‑chain integrations powering millions of transactions.

You will work with backend and product teams, review code, and evaluate new blockchain technologies, with a focus on security and reliability in fast-paced environments.