Senior Security Engineer

  Competitive salary, equity, and benefits with meaningful work attached

The Role

As a Senior Security Engineer, you will lead the design and implementation of security tooling, harden our cloud and IT infrastructure, and serve as a key responder to incidents. You will work across a globally distributed team and partner closely with Engineering to manage AI-enabled risk. Key Responsibilities

Lead security and IT projects to enhance the security posture of infrastructure and the company

Detect, investigate, and remediate security incidents using SIEM, EDR, and SOAR tooling (e.g. CrowdStrike, SentinelOne)

Conduct threat hunting across cloud and endpoint environments using a Zero Trust framework

Administer company-wide IAM and security monitoring infrastructure

Contribute to security policies, incident response, forensics, and endpoint management programmes

Partner with Engineering to assess and mitigate risks from AI-enabled tools and workflows

Explore and implement AI/automation in detection, analysis, and response pipelines

Engage closely with North American and international staff across time zones

Required Background & Skills

  Bachelor’s degree in Computer Science or a related field, or significant professional security experience

  3+ years of hands-on experience in security engineering and incident response

  Experience with SIEM platforms and security monitoring systems

  Experience with EDR tools such as CrowdStrike or SentinelOne

  Knowledge of SOAR platforms and automation of security workflows

  Familiarity with Zero Trust architecture principles and threat hunting methodologies

  Experience with cloud security controls across AWS, GCP, and/or Azure

  Strong knowledge of Linux systems and Kubernetes/Docker environments

  Experience with IAM solutions and infrastructure automation

  Practical experience evaluating security implications of AI systems and AI-assisted workflows

  Experience managing security of Microsoft 365 and Google Workspace tenants

  Excellent written and verbal communication skills

Preferred Background & Skills

Experience with certification processes: SOC2, ISO 27001, FedRAMP, or Cyber Essentials Plus 

Certifications: OSCP, GCIH, GCFA, or equivalent penetration testing / incident response credentials

Experience in Go or Python

Background in open-source communities

Endpoint security management experience in a fully remote organisation

Export Control & Eligibility

This role may involve access to information subject to U.S. export control regulations (EAR/ITAR). Applicants should be aware that eligibility requirements may apply. We encourage candidates with questions about this to reach out. Many UK-based security professionals with defence backgrounds will qualify. We are happy to discuss your specific situation.

Mattermost takes a market-based approach to pay and pay may vary depending on your location. The successful candidate’s starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future.

 

Posting Range

£76,123 — £100,992 GBP

Mattermost is an EEO Employer, we are a remote-first, open-source company.

 

We are continually working to expand our hiring in more countries and regions, ensuring compliance with local laws and regulations, which takes time.

 

Mattermost values your unique perspective—we welcome all applicants. We encourage individuals from all backgrounds to apply and are committed to assessing candidates based on their skills and qualifications. We do not tolerate discrimination against staff or applicants based on race, religion, national origin, age, disability, pregnancy status, veteran status, or other personal characteristics.

 

If you require accommodations during the interview process, please let us know—we’re happy to assist.

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