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Castle Finance

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Solana Smart Contract Engineer

Feb 19
$100K – $150K, 0.25% – 0.5%
Fully Remote

Castle Finance is building the next generation of investment products and financial tools that will enable DAOs to thrive. We are extremely early-stage—this is your chance to get in at the ground floor of the next big brand in DeFi.

We’re backed by top VCs in the industry and our team has worked at some of the best web2 and web3 companies in the world. We move fast, build in the open, and are eager to bring on new team members who share our vision of a decentralized future.


As a Smart Contract Engineer for Castle, you will build programs that will eventually control hundreds of millions of dollars on behalf of the biggest DAOs in crypto. You’ll need to ship code that is clean, secure, and works within the resource-constrained environment that is the Solana blockchain. You’ll have input over the direction of both product features and technical architecture.


  • Building Solana programs in Rust with the Anchor framework

  • Collaborating with full-stack and front-end engineers to ship products and features

  • Building Rust libraries that enable easy integrations with other protocols

  • Writing and maintaining comprehensive test suites for programs

  • Review program code written by other engineers for security and quality

Since we’re a startup, in addition to the above, you’ll have the chance to be involved in other areas of the business like recruiting, marketing, or product design.


None of these are strict requirements—we believe great candidates can come from many different backgrounds.

  • 2+ years of software engineering in a systems-level language like Rust, C++, or C

  • Experience developing smart contracts on Solana

  • Excellent communication ability, especially written

  • Working knowledge of information security

  • Self-starter who can operate under high uncertainty in novel environments

  • Bonus points if you’re a defi-degen or shitcoin-slinger.

Working at Castle

  • Compensation: Your equity comp will be above-market. We set aside an employee option pool big enough that our VCs even asked us about it. Our response? We believe in hiring the best and are willing to pay up to do so.

  • Ownership: From day 1, you will take ownership of a project that is critical to the success of the company. We believe exceptional individuals rise up to the challenges in front of them.

  • Flexibility: Work wherever and whenever you want. We believe remote work is the future and that you will be the most productive when you dictate your own schedule. Funds normally reserved for office-space will be redirected to optimizing your own work environment.

  • Benefits: 401(k) + company match, insurance options, DoorDash stipend, WFH and wellness stipends.