Senior Web Compatibility Engineer

Who We Are

Hi, we're DuckDuckGo, the online protection company and remote-first team of 300+ on a mission to raise the standard of trust online. Founded in 2008 and profitable since 2014, annual revenue now exceeds $100m USD and millions use our browser on Mac , Windows , iOS , and Android , our search engine , and the latest — Privacy Pro . Our culture of trust, inclusivity, and empowered project management underpins everything we do, where each team member takes full ownership of their projects, from scoping and execution to postmortem. If you're seeking end-to-end ownership of your work — you've come to the right place!

Your Team and Role

Working on the Web Dependability Engineering team, you'll make sure websites just work in DuckDuckGo's browsers across Mac, Windows, iOS, and Android, helping ensure our users have the best-possible experience browsing with DuckDuckGo. Recent projects include:

Reverse-engineering how sites detect our privacy protections and building countermeasures that keep pages working

Shimming browser APIs so sites work seamlessly across different browser engines and system webviews

Building LLM agent pipelines that automatically reproduce and triage reported site breakage

As a Senior Web Compatibility Engineer , you'll be our resident expert on why websites break and how to fix them: owning the webcompat side of our triage process, debugging gnarly issues in code you don't control, distinguishing site bugs from browser bugs from privacy protection-induced breakage, leading the charge when a top site breaks and becomes an incident, shipping durable fixes across every platform, and work on related projects that prevent user churn and keep users coming back to DuckDuckGo.

About You

7+ years of experience building and debugging complex web applications with vanilla JavaScript.

Detailed knowledge of web standards, web components, and browser APIs. Any additional experience with our stack is a bonus: Swift/Kotlin/C#/C++/Python.

Advanced ability to reverse-engineer obfuscated third-party code and reduce issues to minimal test cases.

Passion for hunting elusive bugs and tracing them to their root cause.

Interest in automating repetitive work and building agentic tooling that multiplies the team's impact.

Experience triaging issues, leading incident response, and communicating clearly with technical and non-technical stakeholders.

Experience shipping code beyond the web, like native or desktop clients.