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Fixed-rate borrowing against crypto

Senior Front End Engineer


Mainframe is seeking an enthusiastic, self-motivated engineer to help us build the next generation of financial products. You will gain ownership over our existing suite of web products, as well as the ability to influence the ideation, design, and execution of future products. You will be responsible for ensuring a consistent, high-quality user experience across trading interfaces, data-heavy analytics pages, documentation portals and more. Mainframe is building a trustless, open source platform that enables fixed-rate borrowing against crypto, giving users instant liquidity to multiply their investment. We are a remote team so coordinating in slack and via zoom will be required.


  • Experience with the web3 frontend stack (ethers.js/web3.js)
  • 1-3 years of React experience
  • A deep understanding of the architecture of modern client-side React applications
  • Prior experience working with component libraries or design teams in user-facing applications
  • A desire to keep up with modern best practices in web development


  • Prior experience creating a design system or component library
  • Familiarity with the web3 frontend stack (ethers.js/web3.js, client-side private key management, etc.)
  • Familiarity with React Hooks
  • Experience with TypeScript in React
  • Degree in computer science

We are a team mostly located in the Utah, but are very open to remote work for the right candidate. Compensation will be competitive and commensurate with experience.

Mainframe welcomes all qualified persons to apply regardless of race, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. Compensation will be competitive and commensurate with experience. This is a full time role which includes health insurance and other benefits.

How to Apply

If you do not have experience building a front-end application for ethereum smart contracts with web3.js do not apply.

Send an email to [email protected] with your Github/CV/LinkedIn and a message letting us know why you are best for this role, along with a response to the following question: What have you built with web3.js? (please provide links to the project or repository).

Mainframe website

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