Senior Security Engineer

Senior Security Engineer - Identity & Directories
Join Telstra's Security & Operations team as a Senior Security Engineer - Identity & Directories, and help safeguard the identity infrastructure that underpins the digital backbone of Australia's largest telco.
Sitting within our Information and Cybersecurity function, this role focuses on hardening and securing Telstra's enterprise Microsoft Active Directory (AD) environment, a core component of our identity and access management (IAM) ecosystem.
You'll work end-to-end across the design, deployment, and ongoing support of Active Directory integrations and security uplift activities.
From lifecycle management to recovery tools, you'll be hands-on in delivering resilient identity infrastructure and responding to internal and external audit requirements.
This is a high-impact, technical individual contributor role, ideal for someone who's experienced with enterprise identity environments and passionate about securing core digital assets.
What You'll Do
Lead and support the secure design and implementation of AD integrations and IAM services
Collaborate across cyber, IT, and DevOps teams to embed secure identity practices
Drive hardening, remediation, and response activities for AD and directory-related threats
Contribute to security architecture, frameworks, and standards across identity systems
Provide expert input into audits, compliance reviews, and advanced threat response
Implement and maintain observability and recovery solutions for identity infrastructure
You're an experienced infrastructure security engineer or identity specialist who thrives in enterprise environments.
You have strong Active Directory knowledge and can troubleshoot, script, and collaborate across teams to protect critical services.
What you bring
Expert-level knowledge of Microsoft Active Directory Domain Services (design, deployment, and security hardening)
Hands-on scripting and troubleshooting skills, PowerShell proficiency required
Solid understanding of authentication protocols (LDAP/S, Kerberos, NTLM) and networking concepts (DNS, load balancing)
Experience working with or supporting IAM tools and processes
Familiarity with audit remediation, threat detection tools, or recovery platforms.
Experience with Microsoft Identity Manager (MIM) - lifecycle, role-based access, workflows
Exposure to Semperis ADFR/DSP, CrowdStrike Identity, or similar identity security platforms
Knowledge of identity observability and recovery strategies in enterprise settings.
Why Telstra?
Flexible work - we support hybrid and remote working
16 weeks paid parental leave - for both primary and secondary carers
Laptop/device allowance - refreshed every 2 years
Professional development - grow your skills with us
Purchased annual leave - buy extra time when you need it
Exclusive discounts - on Telstra products and services
If this sounds like the right opportunity for you, we'd love to hear from you.
Apply now and join a team securing the future of Telstra's identity infrastructure.
Diversity, Inclusion & Accessibility
We're committed to building a diverse and inclusive workforce in all its forms.
We strongly encourage applications from people of all backgrounds, including those from diverse gender, cultural and linguistic communities, and individuals living with a disability.
To learn more about how we support our people, including accessibility adjustments during the recruitment process, visit: tel.st/thrive
Seniority level
Mid-Senior level
Employment type
Full-time
Job function
Information Technology
Industries
Technology, Information and Internet
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