or apply directly on Mozilla's site. We never take the application ourselves.
Is this posting real?
- This role has been open
- 23 days Mozilla's roles stay open a median of 23 days
- Reposted
- No
- Salary listed
- No 20% of Mozilla's roles list one
- Ghost-job risk at Mozilla
- moderate 15 stale, 3 reposted of 76 open
- Hiring momentum
- 159 roles opened in the last 90 days ↑ up vs. the prior 90 days
- Last confirmed on the employer's board
- 2026-09-17
Measured from postings appearing on and disappearing from Mozilla's own greenhouse board since 2026-08-03. Full hiring picture for Mozilla.
About this role
As a Senior Staff Performance Engineer at Mozilla, you will focus on enhancing the performance of the Firefox browser by writing code, analyzing performance bottlenecks, and collaborating with various engineering teams. Your role involves using multiple programming languages, particularly C++ and JavaScript, to tackle performance issues and educate other engineers on best practices. You will also help shape the future of performance benchmarks and develop strategies for the Performance team.
- benefits
- 5/5
- freshness
- 4/5
- career value
- 4/5
- role clarity
- 4/5
- pay transparency
- 0/5
Scored from the posting itself — how clearly the role is described, how much it says about pay and benefits, and how recently it was listed. Not a judgement of Mozilla as an employer.
What you need
- BS/MS in CS or CE
- 7+ years relevant experience
- Mastered understanding of programming in C++
- Understanding of programming in JavaScript
- Proven experience developing performance critical software
- Skill in debugging and analyzing performance bottlenecks
Nice to have
- Familiarity with Web Standards or patterns
- Familiarity with Android or Windows OS application programming
- Solid understanding of statistics
- Prior experience working on a modern web browser
What you get
- Generous performance-based bonus plans
- Rich medical, dental, and vision coverage
- Generous retirement contributions with 100% immediate vesting
- Quarterly all-company wellness days
- Country specific holidays plus a day off for your birthday
- One-time home office stipend
Worth weighing
- Remote position may require strong asynchronous communication skills
- Focus on performance may limit exposure to other areas of software development
- Vague details on the specific technologies and frameworks used
Summarised from Mozilla's posting. Read the full original.
Listed by Mozilla on their greenhouse job board, last confirmed open on 2026-09-17. PitchMeAI is not the employer.
More roles at Mozilla
- Software Engineer, Release EngineeringRemote
- Software Engineer, Release EngineeringRemote Canada
- Lifecycle Marketing Operations Manager, Firefox MobileRemote Canada
- Lifecycle Marketing Operations Manager, Firefox MobileRemote
- Lifecycle Marketing Operations Manager, Firefox MobileRemote US
- Senior Lead, Enterprise Partnerships & StrategyRemote Canada
- Senior Lead, Enterprise Partnerships & StrategyRemote US
- Senior Lead, Enterprise Partnerships & StrategyRemote