Job Description
An exciting opportunity is available for an experienced Lead Penetration Tester to join a high-performing cyber security team within a large federal government setting.
In this role, you will lead the delivery of complex penetration testing and vulnerability assessment activities across enterprise systems, helping to identify security weaknesses and strengthen cyber resilience.
You will also provide expert technical advice, influence security practices, and mentor team members.
The successful person will be a highly skilled cyber security professional with a strong background in penetration testing within complex environments.
Key Responsibilities
Lead and deliver penetration testing and vulnerability assessments across applications, infrastructure and enterprise platforms
Conduct advanced threat simulations to identify weaknesses in security controls
Develop and execute security testing plans and methodologies
Provide technical leadership and oversight of testing activities and findings
Analyse and report on vulnerabilities, including clear remediation recommendations
Collaborate with system owners to define scope and ensure effective remediation
Drive continuous improvement of tools, techniques and procedures
Mentor and coach team members,



supporting capability uplift and knowledge transfer
Contribute to security standards, risk assessments and governance activities
Key Experience
Proven experience leading complex penetration testing engagements and simulated attack exercises
Deep expertise across web, mobile and infrastructure testing
Strong understanding of security vulnerabilities, controls and risk management
Experience providing technical advice to senior stakeholders
Ability to lead teams, set priorities and manage competing workloads
CREST, OSCP/OSCE, CEH, GIAC, or CompTIA Security+/PenTest+ (or equivalent)
AGSVA NV1 clearance required (Baseline may be considered)
What's on Offer
Hybrid working arrangement with 2-3 days in the office
12 month contract + 2x 12-month extension options
Opportunity to support the cyber uplift for a major Federal agency
Influence enterprise-level security posture and resilience
Due to the nature of this role, this job is open to Australian Citizens only.
Calleo is an equal opportunity employer and we encourage applications from all people including Aboriginal and Torres Strait Islander peoples.
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📌 Penetration Tester (Victoria)
🏢 Calleo
📍 Victoria