Protocol Engineer
Fun provides payment technology infrastructure for modern fintechs, DeFi and trading platforms, and sports and gaming applications. Its products help clients move funds between crypto and fiat, optimize deposits and withdrawals, orchestrate stablecoin payments, and provide unified checkout flows.
Funding history
Projects
About The Fun Group, Inc.
The Fun Group, Inc. builds financial and payment infrastructure for modern capital markets where digital assets and fiat converge. Its technology products include Deposit, Withdraw, Orchestration, and Checkout, enabling applications to offer localized crypto and fiat payment methods, multi-chain routing, stablecoin-payment flows, liquidity management, and instant settlement. Fun serves fintech and payment platforms, DeFi and trading applications, and prediction-market and gaming products; payment and financial services are delivered by its regulated partners.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
You will design and implement secure, efficient smart contract systems and blockchain integrations that power transactions across multiple chains. You will write highly efficient, well-tested code, participate in security audits, research new blockchain technologies and DeFi primitives, collaborate with product and backend teams to architect solutions, and contribute to incident response and on-chain debugging to ensure protocol reliability.
Requirements
- 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 such as Solidity, Rust, or Move
- 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 communication skills to explain complex blockchain concepts to cross-functional teams
- Production experience with multiple blockchain ecosystems such as Ethereum, Solana, and L2s
- Experience with cross-chain bridges, oracles, or interoperability protocols
- Background with high-volume DeFi protocols or DEX infrastructure
- Contributions to blockchain open source projects or protocol research
- Experience with formal verification or advanced smart contract testing frameworks
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 debug on-chain issues to ensure protocol reliability