Senior Information Security Engineer

About Optiver

Optiver, headquartered in Amsterdam and operating globally from key cities including Sydney, is a prominent market maker specializing in liquidity provision across multiple financial exchanges. Founded in 1986, Optiver employs around 2,000 professionals worldwide and focuses on advancing market efficiency through competitive pricing, smart risk management, and robust execution. Its trading scope covers listed derivatives, cash equities, ETFs, bonds, and foreign currencies, using proprietary capital and taking on its own risk.

Role Summary

The role of Senior Information Security Engineer involves actively protecting and improving the security posture of Optiver's worldwide infrastructure, spanning cloud services such as AWS and Microsoft 365, as well as on-premise systems. The position demands vigilance in daily security operations, rapid incident response, automation of security procedures, and enforcing best security practices across various teams. Candidates should bring an engineering mindset with keen attention to detail and a preference for effective yet practical solutions.

Primary Responsibilities

• Conduct daily monitoring of security environments, identifying threats, investigating alerts, and managing incident responses both in cloud and on-premise infrastructures.
• Enhance the security configuration of Microsoft 365 and Entra ID platforms by implementing Conditional Access policies, Multi-Factor Authentication (MFA), Privileged Identity Management (PIM), Defender solutions, and tenant hardening.
• Develop and maintain automation scripts predominantly in Python and PowerShell to reduce manual security operations and improve threat detection and response.
• Leverage APIs such as Microsoft Graph and REST to integrate and streamline security workflows.
• Perform comprehensive vulnerability assessments, analyze system configurations, and formulate efficient risk reduction strategies.
• Take part in incident response efforts, including investigation, containment, communication with stakeholders, and remediation actions.
• Collaborate closely with teams across engineering, technology, and business units to integrate security best practices effectively throughout the organization.

Candidate Qualifications

• A minimum of five years’ experience in information security or a related technical engineering capacity.
• Strong analytical and problem-solving skills suited to fast-paced environments.
• Proficiency with both Windows and Linux operating systems, and familiarity with core security technologies such as firewalls, endpoint protection, log management, vulnerability scanning, and network security concepts.
• Experienced in scripting with PowerShell and/or Python to aid security tasks.
• In-depth knowledge of secure identity management, authentication techniques, and modern access control models.
• Hands-on experience with security technologies like Endpoint Detection and Response (EDR), Security Information and Event Management (SIEM), Security Orchestration, Automation and Response (SOAR), and Cloud Access Security Broker (CASB).
• Comfortable securing workloads that operate on-premises (bare-metal or containerized) and on Infrastructure as a Service (IaaS) cloud platforms.
• Understanding of identity lifecycle management, role-based access control (RBAC), privileged access management (PAM), and controls around privileged identities.
• Knowledgeable in vulnerability management tools such as Nessus, Tenable, and RunZero, and applying secure configuration standards.
• Experience with data protection strategies, including Data Loss Prevention (DLP) and information classification, using solutions like Microsoft Purview.

Additional Notes

While the role prefers experienced candidates, those with varying profiles are encouraged to apply. The recruitment team will evaluate each application individually.

Our Culture and Benefits

Joining Optiver means becoming part of a collaborative and intellectually stimulating work environment. The company promotes continuous learning, innovation, and mutual support among talented professionals focused on solving complex challenges in financial markets.

• Industry-leading performance-based bonus scheme.
• Opportunities to work with a diverse and highly knowledgeable peer group.
• Access to training, mentorship, and career development resources.
• Complimentary daily breakfast and lunch, along with access to an in-house barista.
• Gym memberships included and weekly chair massage sessions.
• Frequent social events and a company trip every two years to foster team bonding.

Diversity & Inclusion

Optiver values diverse backgrounds and is committed to an inclusive hiring process, welcoming applicants from all walks of life and providing reasonable accommodations where requested.