Smart Contract Developer

Zest Protocol logo Zest Protocol

Job Description

The mission of Trust Machines is to grow the Bitcoin economy. We’ve recently raised $150M to realize this vision, build Bitcoin apps, and the open-source technologies required to unleash the true potential of Bitcoin for DeFi and Decentralized Applications.

The mission of Trust Machines is to grow the Bitcoin economy. We’ve recently raised $150M to realize this vision, build Bitcoin apps, and the open-source technologies required to unleash the true potential of Bitcoin for DeFi and Decentralized Applications.

Zest Protocol is on a mission to expand the Bitcoin economy by building the first on-chain Bitcoin capital markets. We’re building a Bitcoin lending protocol that enables Bitcoin liquidity providers to earn Bitcoin yield through professionally managed lending pools. Zest pools lend to the most credit-worthy participants in the Bitcoin economy, allowing them to borrow against their future earnings and thus growing the Bitcoin economy.

We are a remote friendly-company — with our headquarters in New York and a strong commitment to ensuring people can do great work here and thrive without having to live near an office. This role is open to candidates across the world.

About the Opportunity

We’re looking to work with a smart contract developer in our remote team who can help us upgrade and maintain Zest Protocol’s core smart contracts. Zest Protocol interacts with both stacks and bitcoin blockchains.

The ideal candidate has Solidity (or other smart contract language) experience, experience with Rust, and experience interacting with the bitcoin blockchain. As the second smart contract developer on the team, you’ll be responsible for co-designing and implementing the new contracts or contract changes.

What You’ll Do:

  • Design and implement new Zest Protocol v2 core contracts
  • Ensure contract security by assessing potential attack vectors and preventing exploits
  • Ensure code quality by reviewing together with other smart contract developer
  • Respond to and fix issues raised by security audits
  • Communicate and work closely with developer team

What We’re Looking For:

  • 2+ years of Solidity or other smart contract language development
  • Demonstrable experience of deploying smart contracts run in blockchain protocols
    • Knowledge of security best practices in smart contract languages (knowledge of reentrancy attacks, frontrunning, int overflow and underflow, other exploits..)
    • Proven architectural design skills for creating efficient code patterns optimized for speed and performance
    • Experience auditing contracts
  • 4+ years of experience with Rust or other core programming language core programming languages (C / C# / C++ / python / other relevant)
  • Strong computer science background
  • Experience with web wallets
  • BONUS: Experience with lisp programming language

We’d Also Like to See:

  • Love for Bitcoin and crypto
  • Self-motivated & experience in working with small teams
  • Attitude of humbleness towards technology and the risks of creating problems from trying to solve problems too early
  • Experience building applications that interact with blockchains

We’d love to hear from you even if you don’t have experience or interest in every bullet. There’s no perfect candidate and we want to find the right fit, even if it’s different than we imagine. We especially would like to meet underrepresented/underestimated candidates.

Why Zest Protocol:

  • Experienced founding team; founded multiple startups and one exit
  • Fully funded and backed by Trust Machines, our parent company
  • Flexibility to work from anywhere


  • Competitive NYC based Salary (regardless of location, benchmarked annually) + equity/token
    • (Regardless of location: $100,000 - $180k Base Salary)

What we offer:

  • Work from home
  • Competitive salary based on NYC comp (regardless of location, benchmarked annually)
  • Token incentives
  • Open Vacation Policy, take the days you need
  • Up to 16 weeks of paid parental leave
  • Your choice of technical setup and equipment

Please note that benefits vary by country. The ones shown above are for our full-time U.S.based employees. Benefits information for non-US-based positions will be provided to individuals who interview for those roles.

Trust Machines is proud to be an equal opportunity employer and deeply cares about building a diverse team. Trust Machines is committed to building an inclusive environment for people of all backgrounds. We do not discriminate based on race, color, gender, sexual orientation, gender identity or expression, religion, disability, national origin, protected veteran status, age, or any other status protected by law.

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