UI Engineer | Frontend Developer Job at Antithesis Operations LLC in Vienna

Antithesis is looking for an in-office employee to help improve and maintain our marketing, documentation and product websites / webapps.

As a UI Engineer, you will work closely with the Product Design Director to deliver features requested by the marketing department, documentation creators and product users.

Requirements

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

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 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

Possible contributions

Months 1–3

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.

Months 3–6

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

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