Senior Software Engineer, OS Integration

Mozilla

. Develop fixes, improvements, and new features for Firefox, including cross-platform work .

Posted 11/11/2026full-timeRemote • SwedenSenior💰 SEK 513,000 - SEK 684,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive experience in software engineering with a strong focus on C and C++ for desktop application development across multiple operating systems. Proven ability to collaborate effectively in distributed teams while maintaining high standards of code quality and secure coding practices.

Highest-signal resume keywords

C ProgrammingC++ ProgrammingDesktop Application DevelopmentDebugging SkillsCollaborative Mindset

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

Software EngineeringCross-Platform DevelopmentCode ReviewsSecure Coding PracticesMemory Safety

Soft Skills

Problem-SolvingWritten CommunicationVerbal Communication

Tools & Technologies

FirefoxWindowsMacOSLinuxInstaller Development

Industry Keywords

Open-Source ContributionsMozilla ValuesDistributed Team EnvironmentWeb TechnologiesHTMLJavaScript

Tech Stack

Tools & technologies

JavaScriptLinuxMacOSC++

About the role

Key responsibilities & impact

Develop fixes, improvements, and new features for Firefox, including cross-platform work
Maintain and develop the Firefox installer and updater
Debug and fix software defects to improve Firefox quality and the browsing experience
Contribute to new features and improvements
Break down tasks and work with others to deliver solutions
Collaborate with experienced software engineers and geographically distributed development teams
Perform code reviews and provide technical direction
Interact with teams throughout Mozilla

Requirements

What you’ll need

5+ years of overall software engineering experience
Strong knowledge of C and C++
Experience with desktop application development on Windows, macOS, or Linux with C++
Knowledge of web technologies such as Javascript and HTML
Knowledge of secure coding practices and memory safety concerns
Strong problem-solving and debugging skills
Written and verbal communication skills with a collaborative mindset
Willingness to work effectively in a distributed team environment
Commitment to Mozilla's values: Play to win; Build for People first; Engage Evidence over Ego; Decide and Deliver; Ship, learn and repeat
Bonus: Installer and/or Updater development on any OS
Bonus: Windows internals like the BITS server or MSIX packages
Bonus: Open-source contributions or personal engineering projects

Benefits

Comp & perks

Generous performance-based bonus plans to all eligible employees - we share in our success as one team
Rich medical, dental, and vision coverage
Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
Quarterly all-company wellness days where everyone takes a pause together
Country specific holidays plus a day off for your birthday
One-time home office stipend
Annual professional development budget
Considerable paid parental leave
Employee referral bonus program
Other benefits (life/AD&D, disability, EAP, etc. - varies by country)