Networking - Load Balancer, F5, GTM
- Cognizant
- 9 - 14 years
- Hyderabad
- 1 day ago
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Job Description
Job Description Load Balancer Engineer (F5 LTM, GTM & AVI)
Role Overview
We are looking for an experienced Load Balancer Engineer with strong hands-on expertise in F5 BIG-IP LTM, F5 GTM (DNS/GSLB) and Avi Load Balancer (VMware NSX Advanced Load Balancer). The role involves designing, implementing, operating, and troubleshooting enterprise-scale load balancing solutions to ensure high availability, performance, scalability, and resiliency of business-critical applications.
Key Responsibilities
- Design, configure, and manage enterprise load balancing solutions using F5 BIG-IP and AVI Load Balancer
- Implement highly available and scalable application delivery architectures
- Provide L2/L3 operational support, incident resolution, and root cause analysis
- Perform performance tuning, health monitoring, and traffic optimization
- Support application onboarding, migrations, upgrades, and DR activities
- Work closely with application, network, security, and infrastructure teams
- Maintain documentation, SOPs, and runbooks
- Participate in on-call support and planned maintenance activities
Detailed Technology Responsibilities
F5 BIG-IP Local Traffic Manager (LTM)
Traffic Management & Configuration
- Virtual Servers (Standard, Performance L4)
- Pools and Pool Members
- Health Monitors
- HTTP / HTTPS / TCP / UDP / ICMP
- Custom send/receive string monitors
- Load balancing methods
- Round Robin, Least Connections, Ratio, Fastest, Priority Group Activation
Session & Traffic Optimization
- Persistence Profiles
- Source IP
- Cookie (Insert, Rewrite, Passive)
- Universal persistence
- OneConnect profiles (connection reuse)
- TCP profiles (LAN / WAN optimized)
- HTTP profiles (header insertion, X-Forwarded-For)
- Compression and caching profiles
SSL / TLS Management
- Client-side and Server-side SSL profiles
- SSL offloading and SSL re-encryption
- Certificate lifecycle management (CSR creation, renewals)
- Cipher suite hardening and TLS 1.2 / TLS 1.3 configuration
- Mutual TLS (mTLS)
Networking & High Availability
- SNAT (Auto Map, SNAT Pools)
- VLANs, Self IPs (floating and non-floating)
- Route Domains
- Device Service Clustering (DSC)
- Active/Standby and Active/Active HA
- Config Sync and state mirroring
- Failover testing and validation
- UCS backup and restore
Extensibility & Troubleshooting
- iRules (traffic steering, redirects, header manipulation)
- tcpdump and packet-level troubleshooting
- Log analysis and performance diagnostics
F5 BIG-IP GTM / DNS (Global Traffic Manager)
GSLB & DNS Services
- Configuration of Global Server Load Balancing (GSLB)
- Wide IPs (A, AAAA, CNAME)
- GTM Pools and Pool Members
- Datacenters and Servers
Traffic Steering & Resiliency
- Topology-based routing
- Geographic and proximity-based load balancing
- Availability and performance-based traffic distribution
- Integration with LTM for health monitoring
DR & Business Continuity
- DNS-based failover for disaster recovery
- Multi-datacenter and multi-region traffic management
- DR drills and validation of failover behavior
Monitoring & Operations
- DNS query flow troubleshooting
- Monitor tuning and traffic validation
- Coordination with application teams during outages
AVI Load Balancer (VMware NSX Advanced Load Balancer)
Core AVI Architecture
- Avi Controller deployment and management
- Service Engine (SE) configuration and lifecycle management
- SE Groups and capacity planning
Load Balancing & Application Delivery
- Virtual Services (VIPs)
- Pools and Pool Members
- Health Monitors (HTTP, HTTPS, TCP)
- Load balancing algorithms
- Persistence profiles
- SSL profiles and certificate management
Automation & Analytics
- Avi Analytics and dashboards for real-time visibility
- Traffic flow analysis and performance monitoring
- Autoscaling of Service Engines
- Alerting and proactive issue detection
Deployment & Integration
- Integration with VMware environments
- Hybrid and on-prem deployment models
- Application onboarding and migration from legacy load balancers
Troubleshooting
- L4/L7 traffic analysis
- Controller and Service Engine logs
- Performance bottleneck identification
Required Skills & Qualifications
Must-Have
- 68 years of experience in load balancer technologies
- Strong hands-on experience with F5 BIG-IP LTM
- Strong hands-on experience with F5 GTM / DNS
- Hands-on experience with AVI / VMware NSX Advanced Load Balancer
- Strong understanding of TCP/IP, HTTP/HTTPS, DNS, SSL/TLS
- Experience in enterprise production environments
Good to Have
- Automation using Ansible, REST APIs, or Terraform
- Exposure to cloud load balancers (AWS / Azure / GCP)
- Experience with monitoring and observability tools
- ITIL-based operations experience
Certifications (Preferred)
- F5 Certified Administrator (201)
- F5 CTS LTM
- VMware NSX / AVI certifications
Job Classification
Industry: IT Services & ConsultingFunctional Area / Department: IT & Information SecurityRole Category: IT Infrastructure ServicesRole: IT Infrastructure Services - OtherEmployement Type: Full timeContact Details:
Company: CognizantLocation(s): Hyderabad
Keyskills: Gtm Load Balancer ITIL Certified F5
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