Senior Software Engineer (Browser Extension)

You have extensive experience in software engineering: coding, testing, debugging, and automating complex TypeScript/JavasScript applications

You're comfortable digging into third-party web applications you don't control — inspecting network traffic, DOM structure, and client-side code to understand how a page works

You have the ability to learn new technologies quickly and are eager to do so — especially as browser extension platforms and manifest specs continue to evolve

You focus on correctness, performance, and reliability of background processes

You have excellent communication skills,

You are able to work self-sufficiently at times with minimal direction.

You can coordinate work effectively between yourself and developers working on non-browser platforms.

You have hands-on experience building or maintaining browser extensions (Chrome/Chromium Manifest V3 experience strongly preferred; Firefox/Edge a plus), including background scripts, content scripts, and extension messaging patterns

You understand the security model of browser extensions - permissions, content security policy, isolated worlds, and safe communication between contexts

You have experience building cybersecurity products or features, such as DLP (Data Loss Prevention), DSPM (Data Security Posture Management), or similar security/compliance tooling

Joining Cyberhaven means joining the team building Data Security for the Agentic Enterprise. Traditional tools fall short. Cyberhaven traces the full lifecycle of your data, adapting protection to changing context, so protection moves with the way people actually work, not against it. AI Changed Work. We Protect It. Backed by $250M from leading investors like Khosla and Redpoint, our team includes leaders who built industry-defining technologies at CrowdStrike, Palo Alto Networks, Meta, Google, and more. This role lets you shape the future of data security, working alongside people driven to protect workflows, not just data, for customers who cannot afford to slow down to stay safe.

AI Tools Disclosure: As part of Cyberhaven's hiring process, we use recruiting tools that include AI-powered features to help with tasks like scheduling, note-taking, workflow automation, and other recruiting activities ("AI Tools"). The AI Tools may process information you provide during the application and interview process. When AI-assisted interview note taking is used, candidates are notified in advance and have the option to opt out of the AI-assisted interview note taking.

Cyberhaven is committed to creating a diverse environment and is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.