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About the Role

We are seeking a motivated, hands-on Senior Information Security Engineer to help protect, monitor, and continuously improve the security of our global systems, including cloud (AWS and M365) and on-premises infrastructure. You will play a central part in risk mitigation, incident response, automation of security operations, and embedding security best practices across our organization. An engineering mindset, attention to detail, and a preference for pragmatic solutions are essential.

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 configuration hardening.
Build and maintain security automation using Python and PowerShell, with a strong focus on reducing manual processes and improving detection and response.
Integrate systems using APIs (Graph API, REST, etc) to enhance security workflows.
Perform vulnerability assessments, review system configurations, and develop practical mitigation strategies.
Contribute to incident response activities including investigation, containment, communication, and remediation.
Work closely with engineering, technology, and business teams to embed security best practices.

Requirements

At least 5 years experience in an information security or technical engineering role.
Ability to apply analytical thinking to technical problems within a fast-moving environment.
Comfortable with both Windows and Linux environments; familiarity with common security technologies (firewalls, endpoint protection, log management, vulnerability scanning, network security).
Solid scripting skills in PowerShell and/or Python.
Knowledge of secure Identity Management, authentication principles, and modern access control patterns.
Experience using security tooling such as EDR, SIEM, SOAR, CASB, etc.
Experience securing workloads running both on-premise (bare-metal / container) and on IaaS platforms.
Familiarity with identity lifecycle processes, RBAC, PAM, and privileged identity controls.
Understanding of vulnerability management tools (Nessus/Tenable, RunZero, etc) and secure configuration standards.
Experience with data protection, DLP, or information protection solutions (e.g., Microsoft Purview, DLP rules, classification/labelling).

Skills

Python
PowerShell
Graph API
REST
Microsoft 365
Entra ID
Conditional Access
MFA
PIM
Defender for Endpoint
Defender for Identity
Defender for O365
EDR
SIEM
SOAR
CASB
Nessus/Tenable
RunZero
Microsoft Purview
DLP

Location

Amsterdam
London
Chicago
Austin
New York
Sydney
Shanghai
Hong Kong
Singapore
Taipei
Mumbai

Work Type

Full-time

Experience Level

Senior

Benefits

Performance-based bonus structure
Training, mentorship and personal development opportunities
Daily breakfast, lunch and an in-house barista
Gym membership
Weekly in-house chair massages
Regular social events
Company trip every two years

About the Company

Optiver is a global market maker founded in Amsterdam, with offices in London, Chicago, Austin, New York, Sydney, Shanghai, Hong Kong, Singapore, Taipei and Mumbai.
Established in 1986, today we are a leading liquidity provider, with close to 2,000 employees in offices around the world, united in our commitment to improve the market through competitive pricing, execution and risk management.
By providing liquidity on multiple exchanges across the world in various financial instruments we participate in the safeguarding of healthy and efficient markets.
We provide liquidity to financial markets using our own capital, at our own risk, trading a wide range of products: listed derivatives, cash equities, ETFs, bonds and foreign currencies.

Equal Opportunity

Optiver is committed to diversity and inclusion. We encourage applications from candidates of all backgrounds, and welcome requests for reasonable adjustments during the process.