Staff Software Engineer, DOM Workers Storage
Apply for the Staff Software Engineer, DOM Workers Storage role at Mozilla.
About Mozilla
Mozilla Corporation is a non‑profit‑backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, a privacy‑minded web browser that serves more than 225 million people worldwide.
About the Team and Role
We are hiring a staff engineer for the DOM team, responsible for the Gecko implementation of web standards including IndexedDB, File System, Web Workers, Service Workers, Push API and Notifications API that power websites people use via Firefox.
What You’ll Do

Improve storage, workers and system‑level surfaces of our Web engine, focusing on performance, stability and security.
Develop, debug and test code in a large, complex, multi‑threaded, multi‑process codebase across multiple platforms.
Investigate issues and propose solutions and architectural improvements.
Drive features and projects from start to completion.
Read and implement API specifications, and contribute to the standards process.
Collaborate with the wider Firefox team on shared goals.

What You’ll Bring

Proficiency in C++.
Deep experience with multi‑threaded, multi‑process codebases, including performance‑critical, sandboxed or storage architectures.
Ability to work with web specifications (e.g., IndexedDB, File System, Web Workers, Service Workers).
Cross‑platform development experience with native applications (desktop and mobile).
Proven ability to deliver maintainable solutions in large, evolving codebases.
Strong problem‑solving skills, diagnosing complex issues with minimal logs.
Great written communication skills and ability to lead discussions effectively.
Commitment to our values: welcoming differences, relationship‑minded, responsible participation, grit.

Additional Information
Location: Remote France
Salary range: €65,000—€95,000 EUR
Seniority level: Mid‑Senior level
Employment type: Full‑time
Job function: Engineering and Information Technology
Group: C
Req ID: R2932
EEO Statement
We are an equal‑opportunity employer. Mozilla will not tolerate discrimination or harassment based on any protected characteristics.
Diversity, Equity, Inclusion, and Belonging
Mozilla encourages applications from all equity‑seeking communities and ensures reasonable accommodations for qualified individuals with disabilities.
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