Be part of the team transforming business technology into impactful solutions.
True performance for our customers starts with a true belief in our people.
It's why we've structured our business to help our teams, and their talents, shine bright.
It's why we've created a workplace where people of all backgrounds, beliefs and experiences are warmly welcomed and always empowered.
And it's why we've built an organisation where real innovation, fed by passion and cultivated by collaboration, makes a genuine impact.
Because the innovative technology solutions we build, deliver and manage are only as smart as the people that power them.
What our team say
"With it's incredible team culture, supportive environment, and opportunities for growth, Brennan is a phenomenal place to work. I'm proud to be part of a team that values growth and collaboration and empowers women to thrive."
"Starting with Brennan as an intern was an exciting experience. Talented professionals mentored and guided me at every step, helping me hone my technical skills, gain hands‐on experience, and prepare me for more complex tasks. So much so that when I transitioned to become a Systems Engineer, I really felt the continuous learning opportunities and company support had helped make it possible."
"From my very first hour, I've felt seen and welcomed at Brennan and have been humbled by the support provided by my peers. In addition, our ongoing collaboration with Microsoft enables our teams with the best of their toolsets."
Technology Governance Manager, Brennan Australia
"Every day brings something new at Brennan, ensuring there is never a dull moment. It offers great opportunities for learning and growth. And the recognition for my efforts makes me feel valued and motivated."
"The culture at Brennan is exceptional, with colleagues always eager to offer support and efforts consistently recognised and appreciated."
Security Engineer, Brennan Sri Lanka
"Working for Brennan means being at the forefront of technological innovation. We are fortunate to be part of a dynamic, team-oriented and supportive team that truly values creativity and progress."
Head of Operational Technology, Brennan Australia
"Brennan is a company that truly values its people. Its strong customer focus and integrated values create an environment where learning and growth are consistently encouraged. The people‐first policies foster belonging and inspire continuous improvement. Brennan is a place where efforts are recognised, and there are so many opportunities to thrive."
Pradeep Musham
"Working at Brennan has been exceptional. Starting as an IT intern, I was guided through new challenges and given a wide range of learning opportunities.



Making the experience even more remarkable is how women are welcomed and encouraged to thrive. A culture of inclusivity coupled with a growth‐oriented approach has made Brennan an ideal place to launch and develop my career."
"Brennan is a place I can grow, personally and professionally. The Women Rising program and leadership training have been amazing opportunities, and I really appreciate the supportive environment and positive culture within the business."
Janet Rai
Global offices.
Local colour.
With an international footprint, global ambitions and our deeply connected and collaborative teams, we're making our mark on the world.
We're headquartered in Sydney, welcome talent from anywhere, and champion the vibrant local cultures wherever we have offices, with benefits and work values tailored to match.
Company divisions
Our Teams
Extraordinary people.
Diverse teams.
Shared purpose.
Find your space and place at Brennan.
Genuine recognition?
Too true.
Rewards.
Recognition.
Relaxation.
We don't just pay them lip service.
They're hardwired into our culture.
Awarded to our top performers, outstanding contributors, and those who truly live our values, Brennan's Daredevils is our annual, all-expenses paid, overseas trip open to every team member in every Brennan office around the world.
From jetting off to San Francisco, sitting trackside at Singapore's F1 weekend, or snowboarding in New Zealand (to namedrop just a few), Daredevils is how we show our true gratitude – and your chance to bask in well‐earned glory.
Company values
Real values that drive true performance
Technology never stands still.
Neither do we.
It's why we foster a culture of collaboration and commitment, ownership and improvement to make our lives – and those of our clients – better than they were yesterday.
Here's how.
True opportunities, open now
Explore our open roles and join the team transforming business technology.
Network Security Engineer
IT & Telecomms
IT Security
Permanent / Full Time
20/8/2026
Be part of a fast growing practice
Work closely with clients and help shape their security & networking strategies
Brennan.
Where true performance thrives.
At Brennan, we believe that how technology is delivered is every bit as important as what the technology is.




We focus on creating real and relevant value for customers with solutions that fit their specific needs and always reflect their true interests.
It's a claim backed by our True Performance System – a way of working engineered to get us closer, and deliver better, for our customers and their actual experience of technology.
Why join Brennan
True performance for our customers starts with a true belief in our people.
It's why we've structured our business to help our teams, and their talents, shine bright.
It's why we've created a workplace where people of all backgrounds, beliefs and experiences are welcomed and empowered.
And it's why we've built an organisation where real innovation makes a genuine impact and generates true rewards for our team members.
True rewards
Training and certification bonuses
Culture Awards that recognise excellence
Brennan Daredevils – our annual, all-expenses paid trip awarded to our top performers and outstanding contributors
Vibrant, fun social activities
Discounted hardware and software
An environment that embraces learning and development
The Role
Due to fast paced growth, Brennan's Cybersecurity practice is seeking a Network Security Engineer to join our Security team in Adelaide.
In this role, you will own the end-to-end delivery of high level/low level solution designs, consult with customers, lead projects and coordinate across teams.
You will also provide thought leadership, guidance, and strategic advice to our customers on networking and cybersecurity matters.
Key Responsibilities:
Develop high level and detailed solution designs that meet business and technical requirements
Lead delivery of complex solution components across multiple workstreams
Provide expert consulting, guiding clients through trade-offs, decision points, and risk implications
Translate business needs into structured designs, requirements, and implementation guidance
Coordinate with cross-functional teams to ensure the solution fits enterprise constraints and objectives
Mentor and guide junior staff through project delivery activities
Key Skills:
Clear and concise communication
Attention to detail with the ability to discern checkbox compliance from security control intent and efficacy
Astrong understanding of network and network security technologies such as:
Network concepts
Next-Generation Firewalls: Fortinet or Palo Alto Networks
LAN and WLAN: Juniper, Aruba or Cisco
Datacentre networking: Juniper Apstra
SD-WAN, SSE and SASE: Fortinet, Zscaler, Aruba
Network Access Control: Cisco ISE, Aruba ClearPass
Reverse Proxy, Server Load balancing and WAF: Cloudflare, F5 Big-IP
Brennan is an equal opportunity employer.
As part of our hiring process, you will be required to undertake a National Criminal History Check.
#J-*****-Ljbffr

📌 Network Security Engineer (Adelaide)
🏢 Brennan It
📍 Adelaide