Antithesis · 5 months ago
UI Engineer | Frontend Developer
Vienna, VA, USA
Full-time
Onsite
Mid Level
4+ years expAntithesis is looking for an in-office UI Engineer to enhance and maintain their marketing, documentation, and product websites. The role involves closely collaborating with the Product Design Director to deliver features that meet the needs of various stakeholders.
Artificial Intelligence (AI)Information TechnologyPenetration TestingQuality AssuranceSoftware
Responsibilities
Get up to speed with the Antithesis marketing and documentation websites by making small improvements and fixing bugs
Implement a block on the marketing website based on provided Figma designs
Build a new feature for the documentation website
Take a full Figma mock and implement an entire marketing webpage, adding subtle and engaging effects
Develop a small interactive game for the marketing website to drive engagement
Refactor the websites to support a light theme option
Update the footer and header across marketing and documentation sites to match the new design
Configure a website analytics dashboard (PostHog) to answer key marketing questions
Develop a custom forms component to replace third‑party form widgets, ensuring consistent design and flexibility
Implement a new component for the product design system
Build a new multi-page website section
Develop an interactive tutorial to illustrate key Antithesis concepts
Learn, apply, and improve testing for the marketing and documentation websites
Refine and enhance marketing automations
Implement a new product view based on provided mocks and product brief
Qualification
Required
Experience implementing design mocks in HTML, CSS, and JavaScript
Experience building static websites
Understanding of how the internet and browsers work
At least 4 years of experience improving and maintaining websites
Great attention to detail
A portfolio website or a list of links to projects you've worked on
Preferred
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 creating and shipping a software package (e.g., an npm library)
Experience optimizing web pages for performance
Search engine optimization (SEO) experience
Advanced CSS/JS skills (e.g., 3D, WebGL, visual effects)
Experience creating, scaling, and supporting design systems
Company
Antithesis
Antithesis is a simulation testing company that tests software reliability to find and reproduce software bugs before deployment.
51-200 employees
H1B Sponsorship
Antithesis has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (2)
Funding
Current Stage
Growth StageTotal Funding
$182MKey Investors
Jane Street CapitalAmplify Partners
2025-12-03Series A· $105M
2025-02-13Series Unknown· $30M
2024-02-13Seed· $47M
Leadership Team
Will Wilson
Co-Founder
N
Nick Lavezzo
Chief Operating Officer
Recent News
alleywatch.com
2025-12-09
2025-12-06
Company data provided by crunchbase