Senior Security Engineer (Detection Engineer)

• We're taking an engineering-led approach to detection and response, building internal capability and technical depth alongside AI-assisted tooling. You'll work as an individual contributor, driving workstreams from problem definition through delivery, breaking complex problems into actionable work, and executing independently within agreed architecture and practices
• Permanent role based in Melbourne or Sydney as well as open to remote in other Australian locations

As a Senior Security Engineer in Detection & Response, you'll help modernise REA's detection capability by operating and improving the data flows, telemetry integrations and detection workflows that power the detection platform. You'll use AI-assisted tooling to develop, review and validate high-fidelity detections and response automations, applying sound security judgement and detection-as-code practices to improve coverage and alert quality. You'll evaluate threat intelligence in the context of REA's environment to focus detection coverage on relevant adversaries, investigate suspicious activity, and independently coordinate technical containment and response. You'll work with and be supported by a diverse, dynamic, and well-rounded Detection & Response team. Working with wider Security and Engineering teams, you'll improve detection quality and resilience over time.

Day to day of the job

• Configure and operate the data flows that support our detection platform, including log forwarding, transformation and cost optimisation, working with Platform and Cloud teams where changes to existing integrations are needed.
• Define the threats and behaviours to detect, then review, tune and validate the high-fidelity detections and correlation logic that identify malicious activity across our environment, delivering measurable improvements in detection coverage and alert quality.
• Develop and maintain automated detection testing and validation processes to identify configuration drift, regressions and coverage gaps.
• Analyse security events and logs to identify malicious activity, patterns and emerging attack techniques during investigations and proactive threat hunting.
• Assess relevant threat intelligence and emerging attack techniques in the context of REA's environment, translating the findings into improved detection coverage and signal quality.
• Investigate security alerts and incidents, independently determine whether containment is required, coordinate technical response activities, and communicate findings, actions and risks to the wider incident response team and business stakeholders as needed.
• Develop response playbooks and automation workflows to support rapid and effective incident containment and response.
• Partner with product, platform and engineering teams to ensure new systems and changes have appropriate logging, monitoring and detection coverage.
• Share knowledge with other Security and engineering teams, contributing to documentation, operational practices and continuous improvement.

• Hands-on experience configuring and operating data flows, including log forwarding, data transformation, API integrations, cost-optimised ingestion and observability pipeline tools, with the ability to work with Platform and Cloud teams when existing integrations need changes.
• Practical experience working in cloud environments (AWS, GCP or Azure), with an understanding of cloud and application architectures, logging, monitoring, native security controls and common failure modes, and how to translate these into detection and response requirements.
• Practical experience defining the threats and behaviours to detect, and reviewing, tuning and validating high-fidelity detections through established detection-engineering practices and repository workflows.
• Strong log analysis skills, with the ability to parse, correlate and investigate security events across diverse log sources, and a working knowledge of scripting to understand and work effectively with security automation and SOAR workflows.
• Experience with security observability tooling including EDR, SIEM, CNAPP, SOAR, and identity platforms, understanding their telemetry and how to leverage it for high-fidelity detections
• Solid understanding of attacker techniques and frameworks (e.g. MITRE ATT&CK) and how to translate threat intelligence into effective detections and coverage assessments
• Familiarity with modern DevOps practices including CI/CD pipelines and automated deployment for security tooling
• Ability to build automation workflows for security operations and document operational procedures through playbooks, runbooks and detection test cases

The physical, mental, emotional and financial health of our people is something we'll never stop caring about. This is a place to learn and grow.

Some of our Perks & Benefits include:

• A hybrid and flexible approach to working
• Flexible leave options including, birthday leave and purchase additional leave
• Flexible parental leave offering for primary and secondary carers
• Our Because We Care program offers employees volunteering leave, community grants, matched payroll giving and our Community Café donates 100% of revenue to charity
• Hackdays so you can bring your big ideas to life