Sign in
AboutPrivacyTerms
Senior Software Engineer, Firefox Security
MozillaMozilla

Senior Software Engineer, Firefox Security

BelgiumRemoteFull-time
Pay Range: EUR 56k - EUR 74k / annual
Posted 1 day ago · Oct 15
Apply

Job Description

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 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

Req ID: R3247

Hiring Ranges:

Remote Belgium

€56.000—€74.000 EUR

Originally posted on Himalayas

View job

GRC Engineer (NIST)

Workstreet

  • United States
  • Remote
  • Full-time
Apply
21 hrs ago
View job

Synack Red Team - Pentester

Synack

  • United States
  • Remote
  • Contract
Apply
21 hrs ago
View job

Senior Security Engineer, Network & Zero Trust

Sezzle

  • Argentina
  • Remote
  • Full-time
Apply
21 hrs ago
View job

Risk Process Technical Specialist 2859

CTI Consulting

  • United States
  • Remote
  • Full-time
Apply
22 hrs ago
View job

Senior / Staff Security Engineer

Linear

  • North America
  • Remote
  • Full-time
Apply
22 hrs ago
View job

Senior Cybersecurity Compliance & Risk Assessment Consultant CCPA/CPRA

TestPros

  • United States
  • Remote
  • Part-time
Apply
23 hrs ago
View job

Global Cybersecurity IAM Senior Analyst

Gulf Coast Automation Group

  • United States
  • Remote
  • Contract
Apply
23 hrs ago
View job

Security Analyst - Argentina

Senseon

  • Argentina
  • Remote
  • Full-time
Apply
23 hrs ago
View job

SECURITY ARCHITECT

Vrinda International

  • India
  • Remote
  • Full-time
Apply
1 day ago
View job

Platform Security Engineer

Coverflex

  • United States
  • Remote
  • Full-time
Apply
1 day ago
View job

Senior Software Engineer, Firefox Security

Mozilla

  • Spain
  • Remote
  • Full-time
Apply
1 day ago
View job

Senior Incident Response Consultant, Rapid Response

Sophos

  • Canada
  • Remote
  • Full-time
Apply
1 day ago
View job

Information Security Engineer

Dentons

  • Czechia
  • Remote
  • Full-time
Apply
1 day ago
View job

Senior Analyst, GRC - Remote

DriveTime

  • United States
  • Remote
  • Full-time
Apply
1 day ago
View job

Senior Compliance Specialist

Mechanical Orchard

  • United States
  • Remote
  • Full-time
Apply
1 day ago
View job

Senior Software Engineer, Firefox Security

Mozilla

  • Germany
  • Remote
  • Full-time
Apply
1 day ago
View job

AI Red Team Specialist - Remote | Up to $22/hr

mercor

  • Canada
  • Remote
  • Contract
Apply
1 day ago
View job

Cybersecurity Engineer

BlueCross BlueShield of Tennessee

  • United States
  • Remote
  • Full-time
Apply
1 day ago
View job

Senior Security Engineer - Blue Team

Loadsmart

  • Brazil
  • Remote
  • Full-time
Apply
1 day ago
View job

Security Engineer

CTI Consulting

  • United States
  • Remote
  • Contract
Apply
1 day ago
View job

Senior Software Engineer, Firefox Security

Mozilla

  • Finland
  • Remote
  • Full-time
Apply
1 day ago
View job

Staff Security Engineer, Security Enablement

Doordash

  • United States
  • Remote
  • Full-time
Apply
1 day ago
View job

Senior Software Engineer, Firefox Security

Mozilla

  • Belgium
  • Remote
  • Full-time
Apply
1 day ago
View job

Information Security Solutions Engineer II

Holman

  • United States
  • Remote
  • Full-time
Apply
1 day ago
View job

Director Field Security Technology- Federal/Civilian

Akamai Technologies

  • United States
  • Remote
  • Full-time
Apply
1 day ago
View job

Manager - Information Security & Compliance

Holman

  • United States
  • Remote
  • Full-time
Apply
1 day ago
View job

Senior Security Engineer, Network & Zero Trust

Sezzle

  • Mexico
  • Remote
  • Full-time
Apply
1 day ago
View job

Security Operations Analyst - West Coast

Huntress

  • United States
  • Remote
  • Full-time
Apply
1 day ago
View job

DevSecOps Engineer

Blueprint

  • United States
  • Remote
  • Full-time
Apply
1 day ago
View job

Security Analyst (Governance and Trust)

Chainguard

  • United States
  • Remote
  • Full-time
Apply
1 day ago
PreviousPage 3 of 123Next
MozillaMozilla

Senior Software Engineer, Firefox Security

BelgiumRemoteFull-time
Pay Range: EUR 56k - EUR 74k / annual
Posted 1 day ago · Oct 15
Apply

Job Description

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 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

Req ID: R3247

Hiring Ranges:

Remote Belgium

€56.000—€74.000 EUR

Originally posted on Himalayas