Protocol Engineer

Fun.xyz

. Design, develop, and deploy secure smart contracts and protocol implementations across multiple blockchain platforms .

Posted 11/12/2026full-timeNew York City • New York • United StatesMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and deploying secure smart contracts across multiple blockchain platforms, with a strong focus on blockchain architecture, consensus mechanisms, and cryptographic principles. Capable of collaborating with cross-functional teams to deliver efficient, reliable, and secure blockchain solutions.

Highest-signal resume keywords

Smart Contract DevelopmentBlockchain ArchitectureDeFi ProtocolsSecurity Best PracticesCross-Chain Communication

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Smart Contract Development LanguagesSolidityRustMoveBlockchain Protocol ImplementationConsensus MechanismsCryptographic PrinciplesDeFi Token StandardsAdvanced Smart Contract TestingFormal Verification

Soft Skills

Clear CommunicationCollaboration

Tools & Technologies

EthereumSolanaL2sCross-Chain BridgesOraclesInteroperability Protocols

Industry Keywords

BlockchainWeb3FintechDeFiCrypto Startup

Tech Stack

Tools & technologies

Open SourceRustSolidityWeb3

About the role

Key responsibilities & impact

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
Build infrastructure powering consumer-facing fintech applications and Web3 payments
Implement blockchain integrations supporting millions of transactions across multiple chains

Requirements

What you’ll need

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
Nice to have: Production experience with multiple blockchain ecosystems (Ethereum, Solana, L2s, etc.)
Nice to have: Previously worked at crypto startup or Web3 infrastructure company
Nice to have: Experience with cross-chain bridges, oracles, or interoperability protocols
Nice to have: Background with high-volume DeFi protocols or DEX infrastructure
Nice to have: Contributions to blockchain open source projects or protocol research
Nice to have: Experience with formal verification or advanced smart contract testing frameworks