Senior Security Engineer - SecOps

Coinscapture; Missouri; On-site; USD 140,000 - 190,000; Full time

Benefits offered by this job

Performance-based bonus

Medical, dental, and vision coverage

Retirement plan with vesting

Home office stipend

Professional development budget

Parental leave

Employee referral bonus

Life/AD&D and EAP

Job summary

Mozilla Corporation seeks a Senior Security Engineer to join SecOps, focusing on incident response, threat hunting, and automation. You will drive the full incident lifecycle as a commander and partner with product, engineering, and security teams to keep Mozilla users safe.

You will design playbooks, maintain alerts, and advance telemetry-driven detections while participating in on-call rotations and collaborating across global teams.

Qualifications

• 5+ years of security incidents management at a global scale or in SOC/PSIRT/CSIRT environments.
• Experience with SIEM systems (Splunk, ELK, BigQuery) and endpoint detection/response.
• Hands-on with leading EDR tools and using telemetry to root-cause incidents.
• Experience with SOAR platforms (Tines, Splunk SOAR).
• Strong communication and leadership, cross-functional collaboration.
• Background in software development or engineering operations for consumer products.

Responsibilities

• Identify and respond to security incidents on a global scale.
• Act as incident commander guiding the response lifecycle.
• Design and maintain security alerts, automated actions, playbooks, and escalation workflows for 24/7 IR capability.
• Conduct threat hunting and maintain forward-thinking strategies to combat threats.
• Coordinate with stakeholders to improve preparation, identification, analysis, containment, and post-mortem activities.

Skills

Security incident management

SOC/CSIRT/PSIRT experience

SIEM proficiency

EDR expertise

SOAR platforms

leadership & communication

Software development/engineering ops

cloud technologies (GCP/AWS/Azure)

Education

B.S. in a technology-focused field

Tools

Splunk

ELK

Google BigQuery

Tines

Splunk SOAR

Job description

# Senior Security Engineer - SecOpsmozillaUnknownInfrastructurePosted Sep 30, 2026Why 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