Protocol Engineer

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2h ago

About Us
At Fun.xyz, we believe a tokenized future is a beneficial inevitability, granting financial emancipation to everyone with an internet connection. For a blockchain-first global economy to exist, value exchange must become intuitive, secure, and seamless.

Enter Checkout - the highest converting payment solution in web3. By integrating Checkout, dApps enable users to complete any on-chain action using crypto from a wallet, centralized exchange, or on-ramped fiat from a card or bank account. With access to market-leading routing and their asset portfolio at the point of sale, users are faster, stickier, and more engaged.

We built Checkout because we envision a world where anyone, anywhere, can purchase anything with any asset. If that sounds like a vision you can get behind, we want to hear from you.

Role Overview
We're looking for a Protocol Engineer to join our core blockchain team and help build the foundation of Web3 payments infrastructure. This high-impact role offers the opportunity to work on challenging technical problems at the intersection of smart contracts, cross-chain protocols, and decentralized finance.

You will design and implement secure, efficient smart contract systems and blockchain integrations that power millions of transactions across multiple chains. This role is perfect for a technically strong engineer who thrives in fast-paced environments and wants to shape the future of decentralized finance.

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

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 (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.)

Previously worked at crypto startup or Web3 infrastructure company

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

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
:

Fun

Compensation: $84k - $90k estimated

Location: NY New York US

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protocol engineer blockchain crypto defi ethereum rust solana solidity

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