Senior Information Security Engineer

About the role

Optiver is seeking a motivated, hands‑on Senior Information Security Engineer to protect, monitor and continuously improve the security of its global cloud (AWS and M365) and on‑premises infrastructure. You will play a central part in risk mitigation, incident response and automation of security operations.

Key responsibilities

• Monitor daily security operations, identify threats, investigate alerts and respond to incidents across cloud and on‑prem environments.
• Strengthen Microsoft 365 and Entra ID security through Conditional Access, MFA, PIM, Defender for Endpoint/Identity/O365 and tenant hardening.
• Build and maintain security automation using Python and PowerShell, focusing on reducing manual processes.
• Integrate systems via APIs (Graph API, REST) to enhance security workflows.
• Perform vulnerability assessments, review configurations and develop mitigation strategies.
• Contribute to incident response activities including investigation, containment and remediation.

Required profile

• At least 5 years of experience in information security or technical engineering.
• Strong analytical thinking and ability to work in a fast‑moving environment.
• Comfortable with both Windows and Linux environments and common security technologies.

Required skills

• Python and PowerShell scripting.
• Cloud platforms: AWS and Microsoft 365/Entra ID.
• Security tools: Defender, EDR, SIEM, SOAR, CASB, Nessus/Tenable, RunZero.
• API integration: Graph API, REST.
• Identity management: Conditional Access, MFA, PIM, RBAC, PAM.
• Vulnerability management and secure configuration standards.
• Data protection solutions: Microsoft Purview, DLP rules, classification/labeling.

What we offer

• Performance‑based bonus structure.
• Training, mentorship and personal development opportunities.
• Daily breakfast, lunch and an in‑house barista.
• Gym membership and weekly in‑house chair massages.
• Regular social events and a company trip every two years.