# Senior Staff Performance Engineer, Firefox

**Company:** [Mozilla](https://hotfix.jobs/companies/mozilla)
**Location:** Remote
**Role:** DevOps / SRE
**Salary:** CA$149k – CA$220k/yr
**Experience:** 7+ years
**Skills:** C++, JavaScript, Kotlin, Rust, Python, Vtune, Xperf, Multithreading, Concurrency, Disk I/O, GPU, Web Standards, Android, Windows, Statistics
**Posted:** 2026-08-24

> Leads Firefox performance engineering by writing code, profiling bottlenecks, improving benchmarks, and guiding cross-functional teams. Requires 7+ years of experience, strong C++ and JavaScript skills, and expertise in performance-critical software, profiling, concurrency, and systems analysis.

## Job Description

## Responsibilities
- Write code and tests, build prototypes, and diagnose performance bottlenecks.
- Profile and analyze performance issues across Firefox on Windows, Android, Linux, and macOS.
- Use C++, JavaScript, Kotlin, Rust, and Python, with emphasis on C++ and JavaScript.
- Educate engineering teams through code reviews, talks, tooling, and documentation.
- Define and drive actionable next steps from high-level objectives.
- Lead performance efforts with engineering teams across the organization.
- Shape performance benchmarks and prioritize improvements.
- Develop strategies for the Performance team and organization.

## Requirements
- BS/MS in Computer Science, Computer Engineering, or a related field.
- **7+ years of relevant experience**.
- Mastery of C++ programming and understanding of JavaScript.
- Experience developing performance-critical software.
- Experimental, measurement-driven approach to problem solving.
- Experience debugging and analyzing performance bottlenecks with profiling tools such as VTune and Xperf.
- Experience with multithreading, concurrency, disk I/O, and GPUs.
- Track record of setting team goals and driving them to completion.
- Experience motivating and aligning cross-functional teams.
- Strong asynchronous written and verbal communication skills for distributed work.

## Nice-to-haves
- Familiarity with web standards or patterns.
- Android or Windows application programming experience.
- Solid understanding of statistics.
- Experience working on a modern web browser.

## Compensation and benefits
- Performance-based bonus plans for eligible employees.
- Medical, dental, and vision coverage.
- Retirement contributions with immediate vesting.
- Company wellness days, country-specific holidays, and birthday leave.
- Home office stipend.
- Annual professional development budget.
- Well-being stipend.
- Paid parental leave.
- Employee referral bonus program.
- Life and accidental-death-and-dismemberment insurance, disability coverage, and employee assistance programs, varying by country.

## Similar jobs

- [Staff Infrastructure Engineer](https://hotfix.jobs/jobs/b34c9349-da22-498a-9337-4a1f426a0b7f) - VGS - Remote - $145k – $260k/yr
- [Staff Engineer, Platform & Infrastructure](https://hotfix.jobs/jobs/48b953ba-a6fb-4833-9ad0-140dfe4943dc) - Nango - Remote - $140k – $220k/yr
- [Staff Platform Engineer](https://hotfix.jobs/jobs/37cd4cd2-d007-4013-8153-5443ae70f1dd) - Nango - Remote - $140k – $220k/yr
- [Site Reliability Engineer, Intermediate to Senior Staff](https://hotfix.jobs/jobs/cb4f85a5-5a0b-4be9-a1ab-cd4b0c01d37b) - GitLab - Remote - $126k – $314k/yr
- [Senior/Staff Kubernetes Infrastructure Engineer](https://hotfix.jobs/jobs/5276ef82-8104-4269-8e3f-7f0e02d35c2d) - Fal - Remote - $180k – $250k/yr

**Apply:** https://hotfix.jobs/jobs/64810199-b6d8-436c-b310-10d723f9bffc
**Canonical:** https://hotfix.jobs/jobs/64810199-b6d8-436c-b310-10d723f9bffc