Senior Network Security Engineer

AC3; Sydney; Hybrid; AUD 140,000 - 180,000; Full time

Benefits offered by this job

Hybrid work (50% in Sydney CBD office)

Health insurance

Salary packaging

Half-day Fridays once a month

Career development opportunities

Job summary

AC3 is seeking a Senior Network & Security Engineer to design, build and secure complex networks across on‑prem, AWS and Azure with a hybrid work model in Sydney. You will mentor engineers, translate customer needs into practical infrastructure, and influence architecture decisions with senior stakeholders.

You’ll need 10+ years in Network & Security, strong Cisco R&S and cloud experience, and relevant certifications.

Qualifications

• 10+ years in Network & Security roles.
• Experience in MSP or consulting is a plus.
• Strong knowledge across Cisco R&S, SD-WAN, Azure, AWS.
• Certifications such as CCNA, CCNP, CCIE, Palo Alto or F5 are highly regarded.
• Australian citizenship, eligible for security clearance.

Responsibilities

• Review and improve Scope of Works (SOWs) with pre‑sales consultants/architects.
• Design and document network and security solutions and handover to delivery.
• Provide technical guidance for implementation and support of customer environments.
• Deliver and hand over relevant documentation for smooth onboarding.
• Identify and proactively resolve delivery issues and become a trusted advisor.

Skills

Network & Security

Customer communication

Mentoring

Independent

Pre-sales support

Tools

Cisco R&S

SD-WAN

Azure

AWS

Palo Alto

Fortinet

WiFi

Job description

Design, lead and secure mission-critical platforms for multiple clients across both Government & Private sectors. Mentor other engineers. Sydney CBD.

• Hybrid work (50% in the Sydney CBD office), autonomy and flexibility
• Shape solutions in an environment that rewards innovation and ideas
• Technical trainings & career growth opportunities

Who you'll be working with

At AC3, our purpose is to make technology real, and as leaders in secure multi-cloud solutions, we get to bring that purpose to life for our customers every day. We’re an Australian-owned ICT Managed Services Provider with teams in Sydney, Melbourne, Brisbane, and Auckland, supporting more than 700 enterprise organisations and over 50% of the NSW State Government.

What sets us apart is our culture - people here have real relationships that go beyond work, and maintaining our awesome culture, supportive spirit, and belief that everyone is heard and treated with respect, is a top priority at AC3.

We’re committed to a workplace that fosters open communication, flexible working arrangements, continuous learning, and providing support to get through life’s changing seasons.

We live by the AC3 way - Work Wise, Work Humble, and Work Honest.

Who Are We Looking For?

We’re looking for a Senior Network & Security Engineer who will work closely with the Sales and Consulting teams to convert customer needs into functional solutions and design and build them.

You’ll be someone who can operate independently, hold credible technical conversations with senior stakeholders, and translate complex customer requirements into practical infrastructure solutions. This role suits someone comfortable across on-prem, AWS and/or Azure and hybrid cloud environments, with the ability to shape low-level designs and collaborate with other teams to build the solution.

AC3 is dedicated to growing the representation of women in technology, and women are warmly encouraged to apply.

What You’ll Do?

• Support the pre-sales consultants/architects by reviewing and improving Scope of Works documents (SOWs)
• Offer expertise and recommendations to enhance design & documentation..
• Provide technical expertise to implement comprehensive network & security solutions - planning, installation, configuration, and support of customer environments.
• Prepare and deliver relevant handover documentation for smooth transition into ongoing support
• Proactively identify and resolve delivery issues.
• Become a “trusted advisor” within key customer accounts.

What We'd Love To See?

• 10+ years of experience in Network & Security related roles
• Previous experience working in an MSP or consulting environment highly regarded
• Strong technical knowledge and experience across Cisco R&S, SDWAN, Azure, AWS, Palo Alto, Fortinet, Wifi, etc.
• Experience producing Low Level designs and delivering complex Network & Security solutions
• Exceptional oral and written communication skills, with proven document/report writing ability
• Previous experience mentoring other team members a plus
• Relevant certifications such as CCNA, CCNP, CCIE, Palo Alto or F5 highly regarded
• Australian citizenship, eligible for security clearance

Even if you don’t check every box, your passion and curiosity matter. If this role excites you, we would love to see your application.

What will you gain?

• Company benefits including discounted lifestyle services such as health insurance, salary packaging, hybrid work, and half-day Fridays once a month
• A culture built on respect, where you can flag conduct that feels off and rely on a fair, confidential process that prioritises your safety and wellbeing.
• Join supportive colleagues in groups such as Rise Up: a networking group for women in tech to learn in a positive and safe environment and Speak Up Advisors: a group who help maintain a safe space for raising concerns.
• Access to career development opportunities, that helps some 30 AC3ers progress year on year.
• Flexible Hybrid work options and real work life integration
• Convenient Sydney CBD location with modern offices

We’d love for you to experience the AC3 way for yourself!

Women, non-binary and gender diverse people are encouraged to apply.