Web3 Payments Protocol Engineer

fun.xyz

San Francisco (CA)

On-site

USD 180,000 - 260,000

Full time

3 days ago

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Job summary

Fun is building the infrastructure powering Web3 payments and onboarding; we are seeking a Protocol Engineer to join the core blockchain team to work on smart contracts and cross-chain protocols. You will design and implement secure contract systems that power millions of transactions across multiple chains, collaborating with backend and product teams in a fast-paced fintech environment.

This role is ideal for a technically strong engineer with a passion for security, DeFi, and scalable

Qualifications

Production smart contracts on major blockchain platforms.
Deep understanding of blockchain architecture, consensus, and cryptographic principles.
Hands-on with Solidity, Rust, Move.
Knowledge of DeFi protocols and token standards.
Security-minded with common smart contract vulnerabilities.
Ability to explain blockchain concepts to cross-functional teams.

Responsibilities

Design and deploy secure smart contracts across multiple blockchain platforms.
Collaborate with backend and product teams to architect blockchain solutions.
Write well-tested code and participate in security audits.
Research new blockchain technologies and DeFi primitives for integration opportunities.
Respond to incidents and debug on-chain issues for protocol reliability.