Protocol Engineer: Fun in New York

WiredCurrencies; New York, Northern (NY, KY); Hybrid; USD 150,000 - 210,000; Full time

Job summary

Fun in New York, NY is hiring a full-time Protocol Engineer to join the core blockchain team. You will design, develop, and deploy secure smart contracts and protocol implementations across multiple platforms for Web3 payments infrastructure.

You will bring production smart-contract experience, blockchain architecture and cryptography knowledge, and familiarity with Solidity, Rust, Move, or similar languages. Collaboration with backend and product teams is essential.

Qualifications

• Production smart-contract development experience is required.
• Knowledge of blockchain architecture and cryptography.
• Experience with Solidity, Rust, Move or similar languages.
• Experience with DeFi protocols, token standards, cross-chain communication.
• Experience with security audits, incident response, and on-chain debugging.

Responsibilities

• Design and deploy secure smart contracts
• Develop protocol implementations across blockchain platforms
• Write efficient, tested code
• Participate in security audits and incident response
• Research protocols and DeFi primitives
• Debug on-chain issues
• Cross-functional communication for infrastructure decisions

Skills

Smart contract development

Blockchain architecture

Cryptography

DeFi protocols

Cross-chain communication

Security testing & audits

Incident response

On-chain debugging

Solidity

Rust

Move

Job description

Fun is hiring a full-time Protocol Engineer in New York, NY. The role joins the core blockchain team and develops smart contracts and protocol implementations for Web3 payments infrastructure. Work mode is not provided by the employer. Salary, benefits, application deadline, start date, and street address are not provided by the employer.

The position requires production smart-contract development, blockchain architecture knowledge, cryptography knowledge, and experience with Solidity, Rust, Move, or a similar language. The engineer also works with DeFi protocols, token standards, cross-chain communication, testing, security audits, incident response, and on-chain debugging. The role concerns infrastructure used by cryptocurrency companies and fintech builders.

Role: Protocol Engineer

Employer: Fun

Location: New York, NY

Employment type: Full-time

Work mode: Not provided by the employer.

Salary: Not provided by the employer.

Application deadline: Not provided by the employer.

The applicant's production smart-contract work, protocol knowledge, and security experience provide the main evidence for the role. The application also requires a clear account of the blockchain languages and ecosystems used in shipped work.

Smart Contracts For Web3 Payments

The Protocol Engineer designs, develops, and deploys secure smart contracts across multiple blockchain platforms. The work supports infrastructure for consumer-facing financial technology applications, including onboarding, account access, and money movement.

Fun's infrastructure powers millions of transactions across multiple chains. The engineering role therefore covers code quality, protocol behavior, security review, and the operational response to issues that affect on-chain systems.

Protocol Development And Security Work

The engineer collaborates with backend and product teams on blockchain solutions. The work includes writing efficient tested code, taking part in security audits, researching blockchain protocols and DeFi primitives, and debugging on-chain incidents.

Cross-functional communication is part of the technical requirement. The engineer explains complex blockchain concepts to other teams while contributing to infrastructure decisions that affect payments and financial applications.

• Design and deploy secure smart contracts
• Develop protocol implementations across blockchain platforms
• Write efficient, tested code
• Participate in security audits and incident response
• Research protocols and DeFi primitives
• Debug on-chain issues

Production Blockchain Engineering Experience

Fun requires strong production smart-contract experience and deep knowledge of blockchain architecture, consensus mechanisms, and cryptography. Hands-on experience with Solidity, Rust, Move, or a similar language is required.

The qualification set also includes DeFi protocols, token standards, cross-chain communication, and smart-contract security. Preferred experience includes multiple blockchain ecosystems, cross-chain bridges, oracles, interoperability protocols, high-volume DeFi or decentralized-exchange infrastructure, open-source protocol research, formal verification, and advanced smart-contract testing frameworks.

Fun And Its Financial Infrastructure Team

Fun builds onboarding and deposit infrastructure for fintech builders. The company focuses on financial infrastructure, engineering, product experience, smart contracts, cross-chain protocols, and decentralized finance.

The Protocol Engineer works on the core blockchain team in a New York setting. The employer does not provide a named bonus plan, insurance plan, equity program, paid leave policy, or other benefit for this position.

Questions About The Protocol Engineer Role

The position joins protocol engineering with payment infrastructure. Its technical scope includes smart contracts, blockchains, testing, security, and production incident work.

The official Lever page is the application route. The employer does not provide a salary, benefits, deadline, start date, street address, or application contact details.

Where Is The Protocol Engineer Role Located?

The position is located in New York, NY. Work mode is not provided by the employer.

What Employment Type Does Fun List?

The role is full-time.

Which Programming Languages Are Named?

The employer names Solidity, Rust, Move, or a similar smart-contract language.

What Blockchain Experience Is Required?

The role requires production smart-contract development, blockchain architecture and cryptography knowledge, DeFi and token-standard knowledge, cross-chain communication experience, and smart-contract security knowledge.

Fun places the role within payment infrastructure rather than a standalone research function. The engineer's work connects on-chain protocol behavior with user onboarding, account access, and movement of money through financial technology products.

The listing does not provide a closing date or start date. The official Lever record remains the application reference for engineers whose production smart-contract work matches the stated requirements.