Senior Web Security Engineer, Browser Platform at Duck Duck Go

Job description

Who We Are Hi, we're DuckDuckGo, the online protection company and remote-first team of 400+ on a mission to raise the standard of trust online. Founded in 2008 and profitable since 2014, our annual revenue is in the hundreds of millions USD and millions use our browser on Mac , Windows , iOS , and Android , our search engine , and the DuckDuckGo subscription . We also offer private, useful, and optional AI, including Duck.ai , which lets you chat privately with ChatGPT, Claude, and other AIs, all in one place. 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 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: SERP security mitigations Agentic browsing security mitigations Agentic browser hardening Browser and sync security audits As a Senior Security Engineer, App Sec , you'll execute on SERP security mitigations (XSS prevention, tooling development to help engineers write safer code), manage application security scanning infrastructure setup, build and maintain harnesses that get security fixes out automatically, 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.), 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). An understanding of the web security model (such as the Same Origin Policy); experience with CSP, CORS, SameSite cookies, sec-fetch-*, CORB, CORP, Sanitizer API, and Trusted Types is beneficial 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 Compensation is transparent across the organization, and all team members within the same professional level and global region receive the same compensation, plus stock options: United States: $190,500 USD United Kingdom: £134,600 GBP Canada: CA$253,500 CAD All other regions*: €157,350 EUR *Team members outside the US, UK and Canada are currently paid $178,500 USD. Pay converts to the EUR amount above on January 1, 2027 for Spanish team members, and approximately February 1, 2027 in all other regions. 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 explains how we prioritize your wellbeing including paid parental leave, office setup, and co-working allowances. Hiring Process Hiri