Senior Web Security Engineer, Browser Platform
Duck Duck Go
| Company | Duck Duck Go |
| Category | Engineering |
| Location | Remote |
| Remote | Remote |
| Employment | Not stated |
| Level | Senior |
| Salary | USD 179k |
| Posted | 4 May 2026 |
| Last verified | 30 Jul 2026 |
| Source | Employer career page (ashby) |
Description
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 on Mac https://spreadprivacy.com/introducing-duckduckgo-for-mac/, Windows https://spreadprivacy.com/windows-browser-open-beta/, iOS https://spreadprivacy.com/duckduckgo-privacy-browser-ios14/, and Android https://spreadprivacy.com/introducing-app-tracking-protection/, our search engine https://duckduckgo.com/, and the DuckDuckGo subscription https://duckduckgo.com/pro. We also offer private, useful, and optional AI, including Duck.ai https://duck.ai/, which lets you chat privately with ChatGPT, Claude, and other AIs, all in one place. Our culture https://duckduckgo.com/how-we-work 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 Security Functional Team, you'll play a pivotal role in ensuring our security capabilities keep pace with our rapid product development, including our expanding AI offerings like Duck.ai and agentic browsing, directly protecting our users across all our products. You'll also maintain incident detection and response capabilities for the company, and work on related projects. Recent projects include:
- Browser and sync security audits
- SERP security mitigations
- Agentic browser hardening
As a Senior Web Security Engineer, Browser Platform, you'll harden our agentic browsing and DuckAI experiences against emerging threats (like prompt injection), conduct browser and sync security audits (special pages, DuckAI integrations, password manager, etc.), execute on SERP security mitigations (XSS prevention, tooling development to help engineers write safer code), build and maintain harnesses that get security fixes out automatically, manage application security scanning infrastructure setup, deliver on internal red-team operations (simulated attack scenarios), support security triage, and more!
ABOUT YOU
- 7+ years of experience in web or application security (performing security assessments, vulnerability research, penetration testing, or secure code review)
- Recent experience creating security focused agentic harnesses
- Experience influencing large feature designs to have security baked in from the start
- Advanced programming or scripting experience with JavaScript. Any additional experience with our stack is a bonus: Swift/Kotlin/C#/JavaScript (native apps) or JavaScript/Perl/Go (search).
- Experience with at least one WebView technology (WebKit, WebView2, Chromium WebView, etc.) and understanding of browser security models (SOP, CSP, CORS, SameSite cookies)
- Hands-on experience identifying and exploiting web vulnerabilities (XSS, CSRF, injection attacks, authorization flaws, etc.)
- Familiarity with security testing tools and frameworks
- Experience partnering and collaborating with Product Engineers, advising on security matters and helping teams ship secure code faster
- Experience shaping how an organisation thinks about security - driving best practices, improving processes, and raising the bar across teams
COMPENSATION
$178,500 USD annually and stock options. Compensation is transparent across the organization, and all team members within the same professional level and global region receive the same compensation.
Eligibility for company-sponsored health benefits is limited to team members based in the United States. This program does not extend to team members located in other countries, such as Canada or the UK.
Our Team Member Support Guide https://duckduckgo.com/assets/hiring/team_support_guide.pdf explains how we prioritize your wellbe
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