
501 - 1000 employees
Founded 1998
👥 B2C
🔒 Cybersecurity
B2C • Cybersecurity • Software
Mozilla is a non-profit organization dedicated to promoting an open and accessible internet. They are the makers of the popular Firefox browser, which emphasizes user privacy, speed, and control. Mozilla also offers a range of products that focus on internet security and privacy, including Mozilla VPN, Firefox Relay, and Mozilla Monitor. Additionally, the organization is involved in open-source projects, AI innovation, and advocating for digital rights. Mozilla aims to empower users with trustworthy technology and policies that protect privacy, support open-source AI development, and foster accountability for tech companies.
🔥 0 minutes ago
🇬🇧 United Kingdom – Remote
💵 £66k - £87k / year
⏰ Full Time
🟠 Senior
👮♂️ Cybersecurity / Security Engineer
Improve your chances of getting an interview by checking your resume score before you apply.

501 - 1000 employees
Founded 1998
👥 B2C
🔒 Cybersecurity
B2C • Cybersecurity • Software
Mozilla is a non-profit organization dedicated to promoting an open and accessible internet. They are the makers of the popular Firefox browser, which emphasizes user privacy, speed, and control. Mozilla also offers a range of products that focus on internet security and privacy, including Mozilla VPN, Firefox Relay, and Mozilla Monitor. Additionally, the organization is involved in open-source projects, AI innovation, and advocating for digital rights. Mozilla aims to empower users with trustworthy technology and policies that protect privacy, support open-source AI development, and foster accountability for tech companies.
• Advance Firefox's security architecture and cryptography stack: Contribute to improvements in Firefox's core security systems, with a focus on cryptographic protocols, WebPKI, and security-sensitive web APIs. Help implement and maintain security features that support the evolution of public key infrastructure on the web. • Design and implement web platform security features: Develop and ship web platform features in collaboration with teammates and the broader web community. Contribute to standards-based, secure, and interoperable implementations across Firefox. • Improve browser reliability, performance, and resource efficiency: Investigate and resolve issues impacting stability, correctness, and performance. Analyze and improve memory usage and efficiency within a complex, multi-threaded browser environment. • Collaborate on security initiatives: Partner with engineers across teams to identify, prioritize, and address security issues. Participate in debugging, root cause analysis, and implementation of effective long-term solutions. • Contribute to technical design and planning: Participate in technical discussions, design reviews, and project planning for security-related initiatives. Help evaluate tradeoffs and contribute to engineering decisions within your area of work.
• Strong software engineering and security fundamentals: Experience in software engineering, with proficiency in C/C++ and a solid understanding of security principles, including cryptographic protocols and implementations. • Experience building and maintaining complex software systems: Ability to contribute to the design, implementation, testing, and maintenance of software in large-scale or security-sensitive environments. • Strong debugging and problem-solving skills: Expertise in diagnosing and resolving issues in multi-threaded, cross-platform native applications, including performance and memory-related challenges. • Collaborative and effective communicator: Ability to work effectively with distributed teams, communicate technical concepts clearly, and collaborate constructively to solve problems. • Growth mindset and willingness to learn: Demonstrated curiosity and desire to deepen expertise in browser security, cryptography, and systems programming while continuously improving engineering skills. • Web platform and modern systems experience: Familiarity with web technologies and interest or experience in Rust. Comfortable working within large, complex, multi-language codebases.
• 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 • Quarterly well-being stipend • Considerable paid parental leave • Employee referral bonus program • Other benefits (life/AD&D, disability, EAP, etc. - varies by country)
Apply Now🕒 Yesterday
Senior Security Researcher conducting PhaaS data recapture for SpyCloud. Involved in security research and collaboration with cross-functional teams worldwide.
🇬🇧 United Kingdom – Remote
💵 £89.9k - £117.1k / year
⏰ Full Time
🟠 Senior
👮♂️ Cybersecurity / Security Engineer
🕒 2 days ago
Senior Consultant assessing security of various client applications. Leading engagements and providing expertise in application security and best practices.
🇬🇧 United Kingdom – Remote
💵 £65k - £134k / year
⏰ Full Time
🟠 Senior
👮♂️ Cybersecurity / Security Engineer
🇬🇧 UK Skilled Worker Visa Sponsor
🕒 2 days ago
Senior Consultant at Coalfire focusing on assessing client applications' security. Collaborating with teams to deliver optimal cybersecurity solutions.
🇬🇧 United Kingdom – Remote
💵 £65k - £134k / year
⏰ Full Time
🟠 Senior
👮♂️ Cybersecurity / Security Engineer
🇬🇧 UK Skilled Worker Visa Sponsor
🕒 2 days ago
Senior Cyber Security Engineer responsible for designing security measures for Azure and M365 environments at Baringa. Collaborating with stakeholders to protect cloud infrastructure and data.
🕒 2 days ago
Information Security GRC Manager overseeing governance, risk management, and compliance for a global environmental consultancy. Working with IT, Legal, and Compliance to embed security into operations.