Senior Security Engineer - Incident Response

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. With more than 225 million people worldwide 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, while never losing our core mission – to make the internet better for people.

About This Team And Role Mozilla is looking for an Incident Responder to monitor and mitigate attacks across Mozilla’s products and services. You will be part of a flexible team responsible for handling security incidents, with years of practical security experience and knowledge of the state‑of‑the‑art for detecting and responding to attacks. You’ll be a trusted member that responds quickly and effectively, with outstanding communication and collaboration skills to work with diverse stakeholders. You’ll help ensure the integrity of Mozilla’s products and keep its users safe in 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 to support a high‑performing 24/7 incident‑response capability.

Conduct threat‑hunting activities, anticipate future threats, and maintain forward‑thinking strategies for tools, technology and 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 SOC, PSIRT, and CSIRT.

Expertise with SIEM systems (e.g. ELK, Google BigQuery, Splunk). Splunk proficiency is preferred.

Expertise with endpoint detection and investigation; hands‑on experience with leading EDR tools and the ability to leverage endpoint telemetry to find root cause.

Expertise with SOAR platforms such as Tines or Splunk SOAR.

Superb communication and leadership capacity; ability to partner effectively with diverse stakeholders.

Real‑world experience in software development and/or engineering operations for consumer products and services; a B.S. in a technology‑focused field is helpful.

Practical experience working with cloud technologies (e.g. GCP, AWS, Heroku, Azure).

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 for all eligible employees

Rich medical, dental, and vision coverage

Generous retirement contributions with 100% immediate vesting (regardless of contribution)

Quarterly all‑company wellness days

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 programOther 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 allow us to do the same for you. 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 encourages applications from everyone, including members of all equity‑seeking communities. We will ensure that qualified individuals with disabilities are provided reasonable accommodations. 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, religion, 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 these characteristics or any other unlawful behavior.

Hiring Ranges Remote France €53 000–€71 000 EUR

#J-18808-Ljbffr