--- title: 'Senior Security Engineer - SecOps at Mozilla' canonical: 'https://feeny.ai/job/senior-security-engineer-secops-mozilla-united-kingdom-39f2ymxr1skd' type: 'job' last_seen: '2026-10-15' --- # Senior Security Engineer - SecOps at Mozilla - **Company:** Mozilla - **Location:** United Kingdom - **Compensation:** £66k–£87k - **Work type:** remote - **Posted:** 2026-09-29 - **Last confirmed live:** 2026-10-15 - **Apply:** https://job-boards.greenhouse.io/mozilla/jobs/8237810 ## 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. About this team and role: Mozilla is looking for an Incident Responder to monitor and mitigate attacks across Mozilla’s products and services. In this position, you will be a part of a flexible team responsible for handling security incidents. As such, you’ll need to have years of practical security experience and knowledge of the state of the art for detecting and responding to attacks. You’ll be someone Mozillians across the company depend on and trust to respond quickly and effectively in a crunch, with the outstanding communication and collaboration skills needed to work in partnership with diverse stakeholders. Most importantly, you will become a critical member of the team responsible for ensuring the integrity of Mozilla’s products and for keeping Mozilla’s users safe, within a company dedicated to building a more secure internet. What you'll do: - Identify and respond to security incidents on a global scale. - Act as an incident commander to drive incidents through the entire response lifecycle. - Design and maintain a portfolio of security alerts, automated actions, playbooks and escalation workflows in support of a high-performing 24/7 incident response capability. - Conduct threat hunting activities, anticipate future threats, and maintain forward-thinking strategies for tools/technology/processes that combat sophisticated threat actors. - Research threat intelligence reports, triage and manage resulting workflows. - Partner with key stakeholders and communicate effectively to maintain a continuously improving feedback loop of preparation, identification, analysis, containment, and post mortem activities. - Participate in on-call rotation. What you'll bring: - 5+ years of demonstrated ability managing security incidents at a global scale and/or experience working in Security Operations Centers (SOC), Product Security Incident Response Teams (PSIRT), and Computer Security Incident Response Teams (CSIRT). - Expertise with security information and event management (SIEM) systems (eg. ELK, Google BigQuery, Splunk, etc.). Splunk proficiency is preferred. - Expertise with endpoint detection and investigation. Hands-on experience with leading EDR tools and demonstrated ability to leverage endpoint telemetry to find root cause. - Expertise with security orchestration and automation (SOAR) platforms such as Tines or Splunk SOAR. - Superb communication and leadership capacity; ability to partner effectively with diverse company stakeholders. - Real-world experience in software development and/or engineering operations for consumer products and services; B.S. in a technology-focused field is helpful. - Practical experience working with cloud technologies (eg. Google Cloud Platform, Amazon Web Services, Heroku, Microsoft Azure, etc.). Competencies: - Ownership and Accountability - Autonomy - High Level of Integrity - Clear Communication - Creative Problem Solver - Passionate about Security What you’ll get: - 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) ## 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: R3224 Hiring Ranges: Remote UK £66,000—£87,000 GBP ## About Mozilla ## Company Overview - **One-liner**: Mozilla is a global nonprofit-backed technology organization that builds privacy-first browsers, AI tools, and internet health initiatives to keep the internet open and accessible to all. - **Entity Type**: Private (nonprofit foundation with a for-profit subsidiary — Mozilla Corporation) - **Headquarters**: San Francisco, California, USA (remote-first globally) - **Founded**: 1998 (Mozilla Project); 2005 (Mozilla Corporation) - **Founders**: Originally founded by Netscape staff and the open-source community; key early leaders include Mitchell Baker (current CEO of Mozilla Corporation) and Brendan Eich (creator of JavaScript) ## Core Business - **Primary industries**: Internet software & services, browser technology, digital privacy, artificial intelligence, online advertising technology - **Target customers**: B2C (individual users — Firefox browser, Pocket, VPN, Relay); B2B (advertisers and publishers via Anonym); developers (open-source tools, MDN Web Docs, AI developer tools) - **Mission statement**: "To ensure the internet is a global public resource, open and accessible to all." — Mozilla Manifesto ## Products & Services - **[Firefox Browser](https://www.mozilla.org/en-US/firefox/)**: Privacy-focused web browser with tracking protection, available on desktop and mobile. Core product. - **[Mozilla VPN](https://www.mozilla.org/en-US/products/vpn/)**: Virtual private network service for online privacy. - **[Firefox Relay](https://relay.firefox.com/)**: Email masking service to protect user identities. - **[Mozilla Pocket](https://getpocket.com/)**: Content discovery and read-later service. - **[Mozilla Monitor](https://monitor.mozilla.org/)**: Data breach alert and personal data removal service. - **[Mozilla.ai](https://mozilla.ai/)**: Open-source AI developer tools and trustworthy AI initiatives. - **[Anonym](https://anonym.co/)**: Privacy-preserving digital advertising measurement platform (acquired by Mozilla in 2022). - **[Fakespot](https://www.fakespot.com/)**: AI-powered tool to detect fake reviews and counterfeit products (acquired by Mozilla). - **[MDN Web Docs](https://developer.mozilla.org/)**: Industry-standard web development documentation and learning platform. - **[Mozilla Ventures](https://mozilla.vc/)**: Venture capital arm investing in responsible tech startups. ## Market Standing - **Valuation/Market Cap**: Not publicly disclosed (private, nonprofit-backed organization) - **Key Revenue**: Approximately $593 million in total revenue (2022, latest publicly available — Mozilla Foundation annual report). The majority comes from search partnerships (primarily Google). - **Notable Partners**: Google (search partnership, revenue driver), Meta (via Anonym), Amazon, eBay, and major ad-tech platforms. - **Growth Signals**: Mozilla has aggressively expanded through acquisitions (Anonym, Fakespot, Pulse, Active Replica); launched Mozilla.ai to bet on open-source AI; growing headcount across engineering, AI, and privacy product teams. As of 2024, the organization employs roughly 800–900+ people globally. ## Competitive Advantages - **Brand trust and mission**: Uniquely positioned as a "not-for-profit" tech company — no shareholder pressure to maximize profit at user expense. Consistently ranked among most trusted tech brands. - **Privacy-first product DNA**: All products are built with privacy and security as core features, not afterthoughts — a strong differentiator vs. Big Tech competitors. - **Open-source foundation**: Transparent codebase, community-driven development, and strong developer credibility (MDN Web Docs is the gold standard for web dev learning). - **Diverse revenue streams**: Beyond browser search deals, Mozilla is building a portfolio of subscription products (VPN, Relay, Monitor Plus) and ad-tech (Anonym) to reduce single-partner dependency. - **Talent and culture**: Decades of experience in remote-first, asynchronous, globally distributed work. Strong engineering culture with deep expertise in privacy, security, and web standards. ## Strategic Focus - **AI with trust**: Building open-source AI tools and models through Mozilla.ai, emphasizing transparency, privacy, and user agency — contrasting with closed, extractive AI from Big Tech. - **Product diversification**: Reducing reliance on search revenue by scaling subscription products (VPN, Monitor, Relay) and ad-tech platform (Anonym). - **Internet health advocacy**: Continuing policy work on data privacy, antitrust, and digital rights through the Mozilla Foundation. - **Firefox revitalization**: Modernizing the browser with new features (vertical tabs, AI-powered tools, improved performance) to regain market share. - **Acquisition integration**: Absorbing and scaling recent acquisitions (Fakespot for e-commerce trust, Anonym for privacy-first advertising). ## Why Work Here - **Culture**: "Remote-first" company with a strong emphasis on asynchronous work, work-life balance, and global collaboration. The culture is mission-driven, collaborative, and values "responsible participation" — generosity and kindness in communication. [mozilla.org](https://www.mozilla.org/en-US/careers/) - **Benefits (US employees)**: - **Health**: 100% premium coverage for medical, dental, and vision for employees and dependents. - **Mental health**: Free therapy and coaching sessions. - **Time off**: 12+ paid holidays, generous vacation and sick leave (accrued from day one), quarterly company-wide wellness days, and your birthday off. - **Parental leave**: 26 weeks paid for childbearing parents, 12 weeks paid for non-childbearing parents. - **Remote-first**: Work from anywhere with a strong stipend for home office setup. [mozilla.org](https://www.mozilla.org/en-US/careers/) - **Engineering culture**: Engineers work on "some of the most interesting challenges facing the internet today — privacy, security, decentralization, access, convenience, compatibility." The Data Organization is at the forefront of using data to guide product decisions while respecting user privacy. [mozilla.org](https://www.mozilla.org/en-US/careers/) - **Diversity & Inclusion**: Mozilla explicitly states it wants to be "a place where everyone can do their best work" and that "diverse perspectives and experiences result in better solutions." They publish transparency data on their progress. - **Open roles**: As of mid-2025, Mozilla has ~90 open positions across engineering (Front-End, Machine Learning, Fullstack), product management, data analytics, marketing, and infrastructure. Key teams hiring include Firefox, Anonym, Fakespot, and Mozilla.ai. [greenhouse.io](https://job-boards.greenhouse.io/mozilla?gh_src=e5ad1d6b1us) ## Sources 1. [Mozilla Careers Page](https://www.mozilla.org/en-US/careers/) 2. [Mozilla About Page](https://www.mozilla.org/en-US/about/) 3. [Mozilla Job Board (Greenhouse)](https://job-boards.greenhouse.io/mozilla?gh_src=e5ad1d6b1us) 4. [Mozilla.org Homepage](https://www.mozilla.org/en-US/) 5. [Mozilla Open Positions List](https://www.mozilla.org/en-US/careers/listings/) ## Other roles at Mozilla - [Software Engineer, Firefox Desktop Integrations](https://feeny.ai/job/software-engineer-firefox-desktop-integrations-mozilla-canada-g6hygj401qp5) — Canada - [Senior Software Engineer, Firefox Security](https://feeny.ai/job/senior-software-engineer-firefox-security-mozilla-sweden-wzj8a9ezb64a) — Sweden - [Senior Software Engineer, Firefox Security](https://feeny.ai/job/senior-software-engineer-firefox-security-mozilla-netherlands-taz27287t6px) — Netherlands - [Senior Software Engineer, Firefox Security](https://feeny.ai/job/senior-software-engineer-firefox-security-mozilla-spain-59b0eft5zzxd) — Spain - [Senior Software Engineer, Firefox Security](https://feeny.ai/job/senior-software-engineer-firefox-security-mozilla-belgium-1r968ft2nxy6) — Belgium - [Senior Software Engineer, Firefox Security](https://feeny.ai/job/senior-software-engineer-firefox-security-mozilla-finland-b6qyz0xa8fs6) — Finland - [Senior Software Engineer, Firefox Security](https://feeny.ai/job/senior-software-engineer-firefox-security-mozilla-france-zq443vhkr2dq) — France - [Senior Software Engineer, Firefox Security](https://feeny.ai/job/senior-software-engineer-firefox-security-mozilla-united-kingdom-w5v5xptfjw5f) — United Kingdom - [Senior Software Engineer, Firefox Security](https://feeny.ai/job/senior-software-engineer-firefox-security-mozilla-germany-302jqrete16t) — Germany - [Staff Firefox Performance Engineer](https://feeny.ai/job/staff-firefox-performance-engineer-mozilla-united-states-76bxmts2ps00) — United States