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Ui Engineer | Frontend Developer

Job

Antithesis

Vienna, VA (In Person)

Full-Time

Posted 4 weeks ago (Updated 4 weeks ago) • Actively hiring

Expires 5/27/2026

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Job Description

UI Engineer Antithesis is looking for an in-office employee to help improve and maintain our design system and product web apps / websites. Find out more about this role by reading the information below, then apply to be considered. As a UI Engineer, you will work closely with the designers and product managers to deliver features and components. Requirements Experience implementing design mocks in HTML, CSS, and JavaScript A solid programming background in algorithms and data structures demonstrable via coding exercise during in-person interview Experience building static and dynamic websites Understanding of how the internet and browsers work At least 4 years of experience creating, improving and maintaining web apps / websites Great attention to detail A portfolio website or a list of links to projects you've worked on Bonus Points Experience with different build tools Experience with testing libraries like Playwright Experience building SPAs with a frontend framework (React, Vue, Svelte, Solid, etc.) Experience in back-end development (Node.js, Python, PHP, etc.) Experience with Terraform Experience with Nix Experience creating and shipping a software package (e.g., an npm library) Experience optimizing web pages for performance Experience creating, scaling, and supporting design systems Possible ContributionsMonths 13 Get onboarded to Antithesis web app and how its working (pretty tricky) Correct a few things in components of our design system. Build a few new components. xywuqvp Take a full Figma mock and implement an entire view/page with components available. Refactor how design tokens and css variables are exported/imported Plan future work on the design system and prepare tickets for it in Linear Months 36 Add significant features to components we have and potentially refactor them Build good interactive examples for the design system and UI kit Learn, apply, and improve testing for our components Refine and enhance old web app pages with new components Ship a new design for a big feature we already had

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