Senior InfoSec Engineer - Cloud Security & Automation

Optiver; Sydney; On-site; AUD 150,000 - 210,000; Full time

Benefits offered by this job

Performance‑based bonus structure

Diverse and intelligent peers

Training and mentorship opportunities

Daily breakfast and in‑house barista

Gym membership and weekly chair masses

Company social events

Job summary

Optiver Sydney is seeking a Senior Information Security Engineer to protect and improve our global systems, including AWS/M365 and on‑prem infrastructure. You will lead risk mitigation, incident response, and security automation to reduce manual work while embedding best practices across the organization.

You will work with engineering and business teams, perform vulnerability assessments, harden configurations, and help scale security across cloud and workloads.

Qualifications

• 5+ years in information security or technical engineering.
• Experience with Windows and Linux environments and common security tech.
• Scripting in PowerShell and Python.
• Knowledge of identity management concepts and modern access control patterns.
• Experience using security tooling such as EDR, SIEM, SOAR, CASB.
• Experience securing workloads on-prem and in IaaS (cloud).
• Familiarity with vulnerability management tools and secure configurations.
• Experience with data protection and DLP solutions (e.g., Microsoft Purview).

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 CA, MFA, PIM, Defender for Endpoint/Identity/O365, and tenant hardening.
• Build and maintain security automation using Python and PowerShell to reduce manual work and improve detection.
• Integrate systems using APIs (Graph API, REST) to enhance security workflows.
• Perform vulnerability assessments, review configurations, and develop practical mitigations.
• Contribute to incident response activities including investigation, containment, and remediation.
• Collaborate with engineering, technology, and business teams to embed security best practices.

Skills

Analytical thinking

PowerShell scripting

Python scripting

Windows & Linux proficiency

Identity management concepts

Tools

EDR

SIEM

SOAR

CASB

Job description

Optiver Sydney is seeking a Senior Information Security Engineer to protect and improve our global systems, including AWS/M365 and on‑prem infrastructure. You will lead risk mitigation, incident response, and security automation to reduce manual work while embedding best practices across the organization.

You will work with engineering and business teams, perform vulnerability assessments, harden configurations, and help scale security across cloud and workloads.