Senior Web Compatibility Engineer

Accountabilities: Own web compatibility triage, investigating and resolving complex issues that prevent websites from functioning correctly across browser platforms. Reverse-engineer third-party and obfuscated JavaScript, isolate root causes, and reduce difficult problems to minimal, reproducible test cases. Determine whether breakage is caused by website implementation, browser behavior, or privacy-protection features, and identify the appropriate technical solution. Lead response to high-impact website compatibility incidents, coordinating investigation, communication, and resolution with relevant technical and non-technical stakeholders. Design and ship durable compatibility fixes across Mac, Windows, iOS, and Android while considering differences between browser engines and system webviews. Develop browser API shims and other technical solutions that allow websites to function consistently across supported environments. Identify opportunities to automate repetitive webcompat work and contribute to LLM- or agent-based tooling for reproducing, diagnosing, and triaging website issues. Contribute to related engineering initiatives designed to improve browser reliability, reduce user friction, and strengthen long-term product engagement. Take ownership of complex and ambiguous projects from scoping through implementation, deployment, and post-launch evaluation with minimal oversight. Requirements 7+ years of experience building and debugging complex web applications using vanilla JavaScript. Deep knowledge of web standards, web components, browser APIs, and the underlying behaviors that affect modern web compatibility. Advanced reverse-engineering skills, including the ability to analyze obfuscated third-party code and isolate problems into minimal test cases. Strong debugging and root-cause analysis skills, with a genuine interest in investigating difficult and elusive technical issues. Experience with one or more additional technologies such as Swift, Kotlin, C#, C++, or Python is an advantage. Experience shipping software beyond traditional web applications, including native or desktop clients. Demonstrated experience triaging technical issues, participating in or leading incident response, and communicating effectively with stakeholders across technical backgrounds. Interest in automation, AI-assisted development, and agentic tooling that can improve engineering efficiency and multiply team impact. Ability to lead technically complex, ambiguous initiatives independently and make sound decisions with limited direction. Strong written and verbal communication skills, combined with a collaborative and ownership-oriented mindset. Benefits Annual compensation: $178,500 USD, plus stock options. Transparent compensation: Compensation is standardized within professional levels and global regions, regardless of team, location, gender, educational background, or years of experience. Remote-first work: Flexible remote work with no core hours and an expected average full-time commitment of approximately 40 hours per week. Wellbeing support: Resources and programs supporting team member wellbeing, including paid parental leave. Home-office support: Office setup and co-working allowances to support effective remote work. Team gatherings: Company-wide and team retreats, with employees expected to travel at least twice per year for these events. Inclusive workplace: Commitment to equal opportunity, accessibility, diversity, equity, and inclusion. Health benefits: Company-sponsored health benefits are available to eligible team members based in the United States; these benefits do not extend to Canada. Accessibility accommodations: Reasonable accommodations are available throughout the recruitment process for qualified candidates.