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With 150,000+ professionals serving 1,000+ global customers across 90 countries, we are committed to driving meaningful digital change and enabling enterprises, associates, and communities to Rise.

Senior Telco Network Engineer — Forward & Reverse Proxy (Fortinet/F5)

Experience: 10+ years in telecommunications, service-provider or large enterprise network operations

Mandatory: Hands-on F5 BIG-IP experience, Forward and Reverse Proxy experience is required for both Fortinet and F5.

Desirable : LB and GSLB experience should be desired.

Role overview:

We are seeking a senior network engineer to design, operate, and optimise critical telco network services, including secure web proxy platforms and global server load balancing (GSLB). You will ensure high availability, performance, and security of customer-facing and internal services across a complex multi-vendor setting. Comparable telco network-security roles combine firewall, proxy, load-balancer, and incident-management responsibilities across large-scale environments.

Key responsibilities:

- Design, deploy, administer, and troubleshoot F5 BIG-IP platforms, including LTM, GTM/GSLB, virtual servers, pools, nodes, health monitors, SSL profiles, iRules, and traffic policies.
- Operate and optimise GSLB services, including DNS-based traffic distribution, data-centre failover, geographic load balancing, latency-based routing, and disaster-recovery scenarios.
- Support telco proxy and secure web gateway services, including URL filtering, authentication, SSL inspection, policy enforcement, allow/block lists, and web-traffic routing.
- Configure and maintain network security controls, including firewalls, VPNs, NAT, access-control policies, certificates,



and high-availability architectures.
- Investigate and resolve complex Level 3 incidents affecting proxy, load-balancing, DNS, routing, switching, and security services within agreed SLAs.
- Lead network changes, migrations, upgrades, implementation testing, rollback planning, and post-implementation validation.
- Work with architecture, security, cloud, and operations teams to improve resilience, automation, observability and service performance.
- Produce high-quality design documents, runbooks, change requests, test plans, and incident reports.

Mandatory requirements

- 10+ years of relevant experience in telco, ISP, managed services, data centre, or large enterprise networking.
- Mandatory hands-on F5 BIG-IP experience, covering LTM and GTM/GSLB, application delivery, SSL offloading, iRules, and traffic-management policies.
- Strong knowledge of TCP/IP, HTTP/HTTPS, DNS, SSL/TLS, routing, switching, BGP, OSPF, VRF, NAT, and IPv6.
- Demonstrated experience supporting production proxy or secure web gateway platforms.
- Experience with high-availability designs, load balancing, failover, and large-scale traffic management.
- Strong incident-management, root-cause-analysis, and stakeholder-communication skills.
- Preferred requirements
- Fortinet experience, particularly FortiGate/FortiOS, FortiManager, and FortiAnalyzer; Fortinet NSE or equivalent certification is desirable.
- Experience with telco-specific security and traffic architectures, such as Gi-LAN, CGNAT, SecGW, GTP firewalling, SASE, ZTNA, WAF, and DDoS protection.
- Familiarity with virtualisation and cloud environments, including VMware, KVM, OpenStack, AWS, or Azure.
- Exposure to SIEM, syslog analysis, monitoring, automation, and scripting, preferably Python.
- Relevant certifications such as F5 CA/CTS, Fortinet NSE, CCNP, or equivalent are advantageous.

Tech Mahindra is an Equal Opportunity Employer committed to diversity, inclusion, and merit-based hiring. Reasonable accommodations are available throughout the recruitment process.

📌 Senior Telco Network Engineer — Proxy & GSLB (Sydney)
🏢 Tech Mahindra
📍 Sydney