Summary
Overview
Work History
Education
Skills
Timeline
Generic

Tejaswini Nalluri

Dallas

Summary

Senior Network & Security Engineer with 9+ years of experience in designing, deploying, and managing secure global network infrastructures. Expertise spans firewalls, SD-WAN, cloud security, load balancing, and automation. Proven ability to drive innovation, optimize performance, and consult on high-stakes security integrations across healthcare, finance, and enterprise clients.

Overview

10
10
years of professional experience

Work History

Security Engineer Consultant

OPTUM
09.2023 - Current
  • Lead firewall deployments and configurations to integrate partner networks securely with Optum’s core infrastructure.
  • Conduct security posture assessments, review policies, and identify high-risk traffic flows for remediation.
  • Upgrade Palo Alto firewalls (PAN-OS) and Panorama, ensuring minimal downtime during cutovers.
  • Troubleshoot critical incidents and provide Tier 3 support for firewall-related issues.
  • Build and configure firewalls for internet connectivity and hosting services.
  • Configured and tested Checkpoint firewalls in a lab environment to evaluate features and validate deployments before production integration.
  • Monitored and maintained Zscaler ZIA and ZPA platforms by analyzing logs, user traffic patterns, and policy compliance, ensuring consistent connectivity and security across distributed environments.

Network Security Engineer Consultant

FREDDIE MAC
08.2022 - 09.2023
  • Administered Palo Alto PA-5040 and PA-7080 firewalls, overseeing configuration, troubleshooting, and maintenance of security policies, NAT, PAT, and URL filtering.
  • Delivered Level 3 operational and incident support, resolving high-priority security issues and ensuring uninterrupted service for critical infrastructure.
  • Managed upgrades of PAN-OS through comprehensive backup protocols, maintaining data integrity.
  • Implemented Zscaler ZIA and ZPA policies for cloud-based internet and private access security, including PAC file configurations, anchoring, and traffic forwarding profiles.
  • Engineered DNS delegations and DHCP configurations using Windows and Infoblox, supporting scalable IP address management.
  • Supported SSL VPN and IPSEC tunnel configurations for secure remote access using Cisco ASA and Juniper Pulse Secure.
  • Deployed F5 LTM and GTM modules for application delivery and global traffic balancing, integrating virtual servers, health checks, and wideIP.
  • Maintained ISE NAC architecture with patching, upgrades, and capacity reviews, providing reliable endpoint access control.
  • Leveraged Splunk for logging and analysis, improving operational visibility across systems.

Network Engineer Consultant

CALLAWAY GOLF
08.2020 - 07.2022
  • Deployed F5 load balancers and Palo Alto firewalls in shared services to secure traffic between on-premises, cloud, and internet.
  • Designed and managed AWS VPC networking (subnets, gateways, NAT, VPNs, ACLs, HA features) for hybrid cloud connectivity.
  • Conducted wireless surveys, designed WLAN architecture, and configured controllers & APs (Cisco/Aruba) with RADIUS authentication and optimized RF parameters.
  • Engineered redundant and failover network topologies for multi-campus connectivity using switching, routing, and firewalls.
  • Led data center architecture operations: managing multi-vendor gear (switches, routers, firewalls, load balancers) and performing regular software upgrades and troubleshooting.
  • Implemented BYOD security strategies and authentication mechanisms to safeguard data transfer across enterprise and guest networks.
  • Collaborated with management, CAB, and cross-functional teams on mission-critical deployments, device lifecycle projects, and infrastructure migrations.

Network Engineer / Tech Lead

IPSOFT INC.
01.2017 - 07.2020
  • Led deployment & operations for Fortune 500 clients across routing, switching, firewalls, and wireless.
  • Supported multi-vendor gear: Cisco, Juniper, Palo Alto, Check Point, F5, FortiGate, Aruba, and Zscaler.
  • Implemented automation using Python & Ansible for inventory reporting and config management.
  • Managed SD-WAN deployments, site-to-site VPNs, and application delivery infrastructure.

Network Engineer Consultant

MCKESSON CORPORATION
08.2015 - 01.2017
  • Configured BGP, OSPF, and EIGRP across routers and data center fabrics.
  • Migrated Applications from Netscaler to F5 Load balancers.
  • Supported migration initiatives involving data centers and secure remote access.
  • Designed, supported, and troubleshot secure LAN/WAN networks in a highly regulated healthcare environment.

Education

Master of Science - Telecommunications & Networking

Southern Methodist University
Dallas, TX

Bachelor of Science - Electronics & Communications

St. Martin's Engineering College
Hyderabad, India

Skills

  • Networking: OSP,EIGRP,BGP, VXLAN,MPLS
  • SD-WAN & SASE : SD-WAN (Viptela, Versa), Zscaler, Prisma Access, Cisco Umbrella
  • Firewalls: Palo Alto, Cisco ASA, Checkpoint
  • Load Balancers: F5 LTM/GTM/APM, Citrix NetScaler,Cisco ACE
  • Cloud: AWS (VPC, Route53, Direct Connect),Meraki
  • Network Automation : Ansible
  • ZeroTrust & Advanced Security : ZTNA, Cloud-based Identity (Azure AD, Okta)
  • Wireless: Cisco & Aruba WLAN
  • Monitoring Tools: Wireshar,SolarWinds,Infoblox,Splunk, NetFlow

Timeline

Security Engineer Consultant

OPTUM
09.2023 - Current

Network Security Engineer Consultant

FREDDIE MAC
08.2022 - 09.2023

Network Engineer Consultant

CALLAWAY GOLF
08.2020 - 07.2022

Network Engineer / Tech Lead

IPSOFT INC.
01.2017 - 07.2020

Network Engineer Consultant

MCKESSON CORPORATION
08.2015 - 01.2017

Master of Science - Telecommunications & Networking

Southern Methodist University

Bachelor of Science - Electronics & Communications

St. Martin's Engineering College

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