Senior Security Engineer

Mattermost; Greater London; Remote; GBP 75,000 - 110,000; Full time

Benefits offered by this job

Fully remote work

Office setup fund

Coworking space stipend

Global and regional team meetups

Growth fund

Unlimited vacation

Family and Friends Days

Async weeks

Health benefits

401(k)

Pension

Open Source Fridays

Community hackathons and events

Job summary

Mattermost is hiring a Senior Security Engineer to protect people, infrastructure, and tooling that goes into building and hosting Mattermost. This hands-on role sits at the intersection of enterprise security engineering, cloud information security, and AI-enabled threat response.

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.

Qualifications

• Experience with IAM solutions and infrastructure automation.
• Experience evaluating AI systems and AI-assisted workflows for security implications.
• Cloud security controls across AWS, GCP, and/or Azure.
• 3+ years hands-on in security engineering and incident response.
• Knowledge of SOAR platforms and automation of security workflows.
• Excellent written and verbal communication skills.
• Experience with EDR tools such as CrowdStrike or SentinelOne.
• Strong knowledge of Linux systems and Kubernetes/Docker environments.
• Experience with SIEM and security monitoring systems.
• Experience securing Microsoft 365 and Google Workspace tenants.
• Familiarity with Zero Trust principles and threat hunting.
• Security certifications such as OSCP, GCIH, or GCFA are a plus.
• Background in open-source communities.
• Experience in Go or Python.
• Endpoint security management in a fully remote organisation.

Responsibilities

• Lead design and implementation of security tooling and controls.
• Harden cloud and IT infrastructure and respond to incidents.
• Detect, investigate, and remediate security incidents using SIEM/EDR/SOAR.
• Conduct threat hunting across cloud and endpoint environments under Zero Trust.
• Administer IAM and security monitoring across the org.
• Contribute to security policies, incident response, and forensics.
• Assess AI-enabled tools and workflows for risk; mitigate where needed.
• Explore AI/automation in detection, analysis, and response pipelines.
• Collaborate with global engineering teams across time zones.

Education

Bachelor’s degree in Computer Science or related field

Tools

CrowdStrike

SentinelOne

AWS

GCP

Azure

Kubernetes

Docker

SIEM

Microsoft 365 security

Google Workspace security

Open-source tooling

Go

Python

Job description

• We are hiring a Senior Security Engineer to protect the people, infrastructure, and tooling that goes into building and hosting Mattermost
• This is a hands-on, high-impact role at the intersection of enterprise security engineering, cloud information security, and AI-enabled threat response
• 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
• 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

Benefits

• Fully remote work
• Office setup fund
• Coworking space stipend
• Global and regional team meetups
• Growth fund
• Unlimited vacation
• Family and Friends Days
• Async weeks
• Health benefits
• 401(k)
• Pension
• Open Source Fridays
• Community hackathons and events

• Experience with IAM solutions and infrastructure automation
• Practical experience evaluating security implications of AI systems and AI-assisted workflows
• Experience with cloud security controls across AWS, GCP, and/or Azure
• 3+ years of hands-on experience in security engineering and incident response
• Bachelor’s degree in Computer Science or a related field, or significant professional security experience
• Knowledge of SOAR platforms and automation of security workflows
• Excellent written and verbal communication skills
• Experience with EDR tools such as CrowdStrike or SentinelOne
• Strong knowledge of Linux systems and Kubernetes/Docker environments
• Experience with SIEM platforms and security monitoring systems
• Experience managing security of Microsoft 365 and Google Workspace tenants
• Familiarity with Zero Trust architecture principles and threat hunting methodologies
• Experience with certification processes: SOC2, ISO 27001, FedRAMP, or Cyber Essentials Plus
• Certifications: OSCP, GCIH, GCFA, or equivalent penetration testing / incident response credentials
• Background in open-source communities
• Experience in Go or Python
• Endpoint security management experience in a fully remote organisation