Senior Security Engineer, Security Incident Response Team (SIRT)

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Senior Security Engineer, Security Incident Response Team (SIRT) | WithMira

Role overview

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Lead and coordinate end-to-end incident response for high-severity security events within a 24/7 global on-call model, with this role operating during U.S. business hours.
Prepare clear executive communications that keep stakeholders informed during incidents
Investigate complex security incidents across cloud environments, applying strong Digital Forensics and Incident Response (DFIR) methodologies
Partnering with Signals Engineering to design and implement detection capabilities, including SIEM use cases, alerting strategies, and telemetry pipelines
Build and enhance automation and AI-assisted workflows to improve triage, investigation speed, and response consistency
Partner with Threat Intelligence to contextualize threats and improve detection coverage
Conduct root cause analysis (RCA) and lead post-incident reviews to drive continuous improvement and risk reduction
Develop and maintain runbooks, playbooks, and operational documentation
Collaborate cross-functionally (Engineering, Infrastructure, Legal, Product, Communications, etc) during incidents and lead proactive initiatives (e.g. tabletops)
Mentor other engineers and help elevate the team’s overall incident response maturity

Strong experience in security incident response and investigations in cloud-first environments
Experience using or administering Git/GitLab in a security or engineering context
Hands-on experience with SIEM, EDR, and/or detection engineering
Experience with cloud platforms (AWS & GCP)
Familiarity with threat intelligence and adversary tactics (e.g., MITRE ATT&CK)
Experience building or working with automation (e.g., Python, scripting, SOAR platforms)
Interest or experience in applying AI/ML or data-driven techniques to detection, triage, or response workflows
Strong analytical and problem-solving skills; ability to operate effectively during high-severity incidents
Excellent written communication skills with a passion for clear, actionable documentation
Growth mindset with a proactive approach to identifying and mitigating security risks