Senior Staff Performance Engineer, Firefox

Mozilla
Canada
Workplace: RemoteFull timeCAD 149,000 - 220,000 annuallyFunction: Solutions Engineering & Sales EngineeringExperience: 7+ yearsEducation: mastersSkills: ["Curiosity","Systems thinking","Measured experimentation","Debugging","Cross-functional collaboration","Asynchronous communication"]

Build and improve performance-critical parts of the Firefox browser by writing code and tests, profiling and analyzing bottlenecks, and driving experimental fixes. Work across Windows, Android, Linux, and macOS, helping other teams write fast and reliable code through reviews, talks, tooling, and documentation. Lead performance benchmarks and priorities for the Performance team while collaborating with cross-functional, distributed engineers.

Loading

Loading job details...

Preparing the role view and application actions.

FursaFursa
Mozilla
Mozilla
3 days ago

Senior Staff Performance Engineer, Firefox

✓ Verified Job

Canonical indexed version, validated from employer's careers page.

Source: Company careers pageValidated by: Fursa AI
Last checked: 1 hour agoStatus: Live

Job Summary

Build and improve performance-critical parts of the Firefox browser by writing code and tests, profiling and analyzing bottlenecks, and driving experimental fixes. Work across Windows, Android, Linux, and macOS, helping other teams write fast and reliable code through reviews, talks, tooling, and documentation. Lead performance benchmarks and priorities for the Performance team while collaborating with cross-functional, distributed engineers.
Location: Canada
Workplace: Remote
Employment Type: Full time
Job Function: Solutions Engineering & Sales Engineering
Seniority: Mid level

Key Responsibilities

  • •Write code and tests, build prototypes, and tackle performance bottlenecks via profiling and analysis.
  • •Use multiple programming languages (with emphasis on C++ and JavaScript) to fix performance issues across a large evolving codebase.
  • •Educate engineers on writing performant code through code reviews, talks, tooling, and/or documentation.
  • •Independently define and drive actionable next steps from high-level objectives while working with engineering teams.
  • •Shape performance benchmarks, priorities, and future strategies for the Performance team and organization.

Pay and Benefits

Salary: CAD 149,000 - 220,000 annually
Perks:Health InsuranceDentalVisionHome OfficeLearning BudgetWell-being StipendPaid ParentalAnnual BonusWellness Stipend

Key Requirements

  • •BS/MS in CS or CE with 7+ years of relevant experience.
  • •A mastered understanding of C++ programming.
  • •Understanding of JavaScript programming.
  • •Proven experience developing performance-critical software with an experimental, measured approach.
  • •Experience debugging and analyzing performance bottlenecks using profiling tools (e.g., VTune, Xperf).
Experience:7+ yearsOpen sourceWeb browser
Education:Master's in CS, CE
Skills:CuriositySystems thinkingMeasured experimentationDebuggingCross-functional collaborationAsynchronous communication
Tech Stack:C++JavaScriptKotlinRustPythonVTuneXperfSampling profilersMultithreadingConcurrencyDisk I/OGPUAndroidWindowsLinuxMacOS

Company Brief

Mozilla
Mozilla is a mission-driven organization that builds open-source internet products (notably the Firefox browser) and advocates for an open, private, and secure web through software, research, and community programs.
Industry: Enterprise Software
Company Size: Large (251 to 1,000 employees)
Growth: Nonprofit & NGO
Headquarters: San Francisco, United States
Founded: 1998
Glassdoor
Glassdoor: 2.9
WebsiteLinkedInGlassdoor