Senior Network Security Engineer

Decipher Bureau; Brisbane; Hybrid; AUD 190,000 - 225,000; Full time

Job summary

Decipher Bureau is seeking a Senior Network Security Engineer / Senior Technical Consultant to design, deliver and implement secure networking for enterprise and federal clients. The role is hands-on and project-based, taking ownership from High-Level Design through Low-Level Design to implementation and handover.

You will work across NGFWs from Fortinet, Cisco, Palo Alto and other vendors, delivering SD-WAN, SASE and SSE solutions, and mentoring junior engineers in a collaborative Secure

Qualifications

• Experience as a Senior Network Engineer or Technical Consultant.
• Hands-on delivery of NGFW, VPN, and SSE/SASE solutions.
• Experience with routing protocols: BGP, OSPF, MPLS, IPsec, GRE.
• Strong customer engagement and ability to run workshops and provide technical recommendations.

Responsibilities

• Design, develop and deliver enterprise network security solutions.
• Own end-to-end delivery from HLD/LLD to implementation and handover.
• Lead complex network security projects across multiple workstreams.
• Design, configure and implement NGFW solutions (Fortinet, Cisco, Palo Alto).
• Deliver secure LAN, WAN, wireless and data centre networking.
• Implement SD-WAN, SASE and SSE to strengthen enterprise security.
• Collaborate with stakeholders to ensure security standards and risk management.
• Mentor junior engineers and share knowledge within the team.
• Keep current on emerging networking and cybersecurity technologies.

Skills

Senior networking

Network security

HLD/LLD

NGFW design

VPN/SSE/SASE

Tools

Fortinet

Cisco

Palo Alto

Juniper

Aruba

Cloudflare

Job description

Setting the Scene

Our client is a leading Australian technology and cybersecurity services organisation with an established and highly regarded Cybersecurity Practice. With a strong reputation for delivering complex technical solutions across the Australian market, the organisation is continuing to invest in its Secure Networks capability ahead of significant growth across the Federal Government sector.

The Role

As a Senior Network Security Engineer / Senior Technical Consultant, you'll play a key role in designing, delivering and implementing secure networking solutions for a range of enterprise and Federal Government clients. This is a predominantly hands‑on, project‑based delivery role where you'll take ownership of technical solutions from High‑Level Design (HLD) and Low‑Level Design (LLD) through to implementation, testing and handover. Working across a broad range of secure networking technologies, you'll provide technical guidance to customers, lead complex project deliverables and collaborate with highly experienced engineers to deliver modern, scalable and secure network environments.

Key Responsibilities

• Design, develop and deliver enterprise network security solutions across complex customer environments.
• Own end-to-end technical delivery, including High‑Level Designs (HLD), Low‑Level Designs (LLD), implementation and operational handover.
• Lead the delivery of complex network security projects across multiple technical workstreams.
• Design, configure and implement next‑generation firewall (NGFW) solutions, including Fortinet, Palo Alto and Cisco technologies.
• Deliver secure LAN, WAN, wireless and data centre networking solutions.
• Design and implement SD‑WAN, SASE and Secure Service Edge (SSE) solutions to strengthen enterprise network security.
• Work across network segmentation, access control, authentication and Network Access Control (NAC) technologies, including Cisco ISE and Aruba ClearPass.
• Provide technical expertise across routing and switching protocols, including BGP, OSPF, MPLS and IPsec.
• Design and implement secure connectivity solutions, including VPN, ZTNA and enterprise gateway technologies.
• Work across reverse proxy, server load balancing, Web Application Firewall (WAF) and DDoS protection solutions.
• Engage directly with customers to understand technical requirements, facilitate workshops and provide recommendations on appropriate network security solutions.
• Identify technical risks, assess solution trade‑offs and ensure designs align with customer requirements and security standards.
• Collaborate with internal engineering teams, project managers and technical stakeholders to ensure successful project delivery.
• Provide technical guidance, mentoring and knowledge sharing to junior engineers and consultants.
• Maintain current knowledge of emerging networking and cybersecurity technologies, platforms and industry developments.

What You'll Bring

• Demonstrated experience in a Senior Network Engineering, Network Security Engineering or Technical Consulting role.
• Strong hands‑on experience across enterprise networking and network security technologies.
• Deep technical expertise in one or more of the following vendors: Fortinet, Cisco, Palo Alto, Juniper, Aruba or Cloudflare.
• Strong understanding of enterprise LAN, WAN, wireless networking, data centre and network security architectures.
• Experience with next‑generation firewalls, including firewall policy design, implementation, inspection and security controls.
• Strong understanding of routing and switching protocols, including BGP, OSPF, MPLS, IPsec and GRE.
• Experience with network segmentation, 802.1x, authentication and Network Access Control (NAC).
• Exposure to SD‑WAN, SASE or SSE technologies, including Fortinet, Zscaler or Aruba, will be highly regarded.
• Demonstrated experience developing High‑Level and Low‑Level Designs (HLD/LLD).
• Proven ability to independently own technical projects from initial design through to implementation, testing and handover.
• Experience working in a systems integrator, managed services or professional services environment will be highly regarded.
• Strong customer engagement skills, with the ability to lead technical discussions, workshops and provide practical technical recommendations.
• A genuine passion for networking and cybersecurity, with a proactive approach to learning and keeping up with emerging technologies.
• Ability to work autonomously, manage technical deliverables and contribute positively to a highly capable engineering team.

Relevant industry certifications will be highly regarded, including CCIE, CCNP, Fortinet NSE/FCP, Palo Alto PCNSE, Zscaler and Juniper certifications. Australian Citizenship is required for Federal Government security clearance eligibility. An active NV1 clearance is preferred, with Baseline clearance also considered.

What's in It for You?

• Salary package of up to $225,000 (approximately $200,000 base + superannuation).
• Permanent opportunity within an established and growing Australian cybersecurity practice.
• Join a highly regarded Secure Networks team of technically exceptional engineers and consultants.
• Work on complex, interesting and challenging network security projects across the Federal Government market.
• Genuine flexibility, with a hybrid working arrangement and approximately three days per week in the Canberra office.
• Accelerated career development, with a clear pathway to progress into a Principal-level position.
• Access to technical training, professional development and certification incentives.
• A collaborative, technically driven team environment that genuinely values learning and knowledge sharing.
• Employee recognition through internal Culture Awards.
• Opportunity to participate in the Brennan Daredevils program, including an annual all-expenses-paid trip recognising outstanding performers and contributors.
• Regular team events, social activities and additional employee benefits.