Senior Software Engineer, Firefox Security

Mozilla
Germany
Remote

Who this role is best for

Best suited to systems engineers with security expertise working in open-source software and enterprise security domains.

Best fit for

  • Candidates with 3+ years in low-level systems programming and security knowledge
    — “3+ years of experience in low-level software engineering”
  • Professionals interested in improving browser security architecture and cryptographic protocols
    — “Strengthen Firefox’s security architecture: Improve Firefox’s core security mechanisms including cryptographic protocols”

Things to consider

  • The role involves significant responsibility in browser security and reliability
    — “Improve browser reliability and performance: Diagnose and resolve issues affecting stability”
  • Candidates must be prepared to work in a remote setting with distributed teams
    — “Experience working with distributed teams”

How to stand out

  • Highlight experience with privilege isolation and trust boundary improvements in your resume
    — “Advance Firefox’s security architecture across multiple operating systems”
  • Demonstrate your ability to debug memory and performance issues in complex systems
    — “Experience diagnosing and resolving issues in multithreaded, cross-platform native applications”
  • Emphasize contributions to open-source security projects or web platform technologies
    — “Web platform and modern systems experience: Familiarity with web technologies”
  • Showcase your ability to work within large, multi-language codebases effectively
    — “ability to work effectively within large, complex, multi-language codebases”
Pace · Fast PacedCollaboration · HighAutonomy · MediumDecision Impact · Team

Derived from job-description analysis by Serendipath's career intelligence engine.

What success looks like

  • implemented security features for Firefox
  • improved Firefox's security architecture
Typical background
systems programming experiencesecurity knowledge

Skills & requirements

Required

Systems ProgrammingSecurity KnowledgeDebugging

Preferred

Web Platform ExperienceRust Programming

Stack & domain

Systems Programming ExperienceSecurity KnowledgeDebugging And Problem-solving SkillsWeb Platform And Modern Systems ExperienceEffective Collaboration And CommunicationWork With Distributed TeamsCommunicate Technical Ideas ClearlyNullSoftware EngineeringSecurity

About the role

Original posting from Mozilla via Greenhouse

Why Mozilla?

Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. 

The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. 

What you’ll do:

Design, build and implement security and hardening features for enterprise users: Design, implement, test, and ship cutting-edge security features that strengthen Firefox’s security posture.

Advance Firefox’s security architecture across multiple operating systems: Contribute to and drive cutting-edge improvements to Firefox’s core security posture, by building privilege isolation and moving trust boundaries or Strengthen Firefox’s security architecture: Improve Firefox’s core security mechanisms including cryptographic protocols, WebPKI, and security-sensitive web APIs.

Contribute to our security initiatives: Work across teams to investigate security issues, identify root causes, and deliver robust, maintainable fixes.

Improve browser reliability and performance: Diagnose and resolve issues affecting stability, correctness, performance, and memory usage in a complex, multithreaded environment.

What you’ll bring:

Systems programming experience and security knowledge: 3+ years of experience in low-level software engineering, strong proficiency in C and/or C++, and a solid understanding of security fundamentals.

Debugging and problem-solving skills: Experience diagnosing and resolving issues in multithreaded, cross-platform native applications, including memory and performance challenges.

Web platform and modern systems experience: Familiarity with web technologies (HTML, CSS, JavaScript) and interest or experience in Rust; ability to work effectively within large, complex, multi-language codebases.

Effective collaboration and communication: Experience working with distributed teams and communicating technical ideas clearly in writing and conversation.

What you’ll get:

Generous performance-based bonus plans to all eligible employees - we share in our success as one team

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

Quarterly well-being stipend

Considerable paid parental leave

Employee referral bonus program

Other benefits (life/AD&D, disability, EAP, etc. - varies by country)

About Mozilla 

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.

Commitment to diversity, equity, inclusion, and belonging

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission.  We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation.

We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws.  Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

Group: D

#LI-REMOTE

Req ID: R3247

Hiring Ranges:

Remote Germany€68.000—€91.000 EUR

Source: Mozilla careers (Greenhouse)

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