SANTHOSH DHARMALINGAM
Coimbatore
Work Preference
Summary
Seasoned Lead Engineer with over 12 years in enterprise and cloud networking, specializing in Zero Trust and infrastructure modernization. Expertise in AWS, Zscaler ZPA, Palo Alto firewalls, F5 load balancing, SD-WAN, routing and switching, and data center migrations. Led global transformation initiatives and delivered secure, scalable network solutions in complex enterprise environments.
Overview
1
1
Certification
13
13
years of professional experience
Work History
Lead Engineer
Avantor (VWR Lab Products Pvt Ltd)
Coimbatore
05.2019 - Current
- Lead global network, cloud, and security engineering activities supporting enterprise infrastructure across EU, NA, and AMEA regions.
- Led Avantor's Zero Trust transformation by migrating approximately 15,000 users from Ivanti VPN to Zscaler Private Access (ZPA).
- Global ZPA Transformation: Technical lead for migration of approximately 15,000 users from Ivanti VPN to Zscaler Private Access, with phased rollout, pilot validation, production cutover, hypercare, and operational readiness.
- Designed and supported ZPA app segments, app connectors, connector groups, access policies, and authentication workflows.
- Coordinated rollout planning, validation, user onboarding, hypercare, and issue resolution for global ZPA migration waves to ensure seamless user transition.
- Troubleshot complex access and connectivity issues, including DNS, routing, NAT, SSL/TLS, VPN, and application access, to restore service continuity.
- Coordinated with infrastructure, workstation, voice, and support teams to deliver secure and reliable global deployments.
- Provided Level 3 engineering support for critical production issues, root cause analysis, and permanent remediation.
- Supported enterprise security and connectivity initiatives involving Palo Alto, F5, AWS, and application publishing.
- AWS Cloud Network Architecture: Supported AWS networking including VPC design, route tables, Transit Gateway, Security Groups, Elastic IP, NAT, and hybrid connectivity; assisted troubleshooting using VPC Flow Logs and packet captures.
- Led global network refresh efforts, migrating sites from Meraki SD-WAN to Cisco Viptela and replacing legacy equipment with Cisco 9000 series switches.
- SD-WAN and Infrastructure Modernization: Supported migration from Meraki to Viptela, LAN/WAN/Wireless refreshes, new office network design, IPsec tunnel lifecycle management, Telepresence, SAP firewall whitelisting, and Juniper Pulse requests.
- Supported datacenter migration planning, implementation, and post-change validation for enterprise infrastructure environments.
- Relocated the Amsterdam datacenter within Global Switch premises with minimal business impact during planned downtime.
- Led identification of key enterprise initiatives to enhance organizational performance.
- Own AWS cloud networking support, including VPC architecture, routing, segmentation, hybrid connectivity, and operational troubleshooting.
- SD-WAN and Infrastructure Modernization: Supported migration from Meraki to Viptela, LAN/WAN/Wireless refreshes, new office network design, IPsec tunnel lifecycle management, Telepresence, SAP firewall whitelisting, and Juniper Pulse requests.
Senior Network Engineer
Technosoft Global Services Private Limited
Coimbatore
12.2018 - 05.2019
- Led migration from old datacenter to new datacenter, enhancing network reliability and performance
- Provided enterprise network support to ensure seamless operations for Archway clients
- Collaborated with Archway (US) to create tailored network solutions for clients
Senior Network Engineer
Netcon Technologies India Pvt Ltd
Hyderabad
06.2013 - 11.2018
- Managed IP addressing, routing, subnetting, VLANs, multicast, VPN, NAT, and high availability configurations for enterprise environments.
- Designed and implemented enterprise IT network infrastructure for Hyderabad City Surveillance datacenter and command control center, enhancing operational capabilities for city surveillance.
- Developed HLD and rollout documentation; configured A10 load balancers, VMware, and Active Directory, ensuring streamlined deployment and system integration.
- Supported enterprise network operations for Archway clients during critical transitions and service continuity efforts.
Education
B.E. - Electronic Communication Engineering
United Institute of Technology
Coimbatore01-2013
HSC -
Sri Sowdeswari Vidyalaya Matric Hr. Sec. School
Coimbatore01-2009
Skills
- Zscaler ZPA
- Zero trust architecture
- AWS VPC transit gateway
- AWS Security groups and route tables
- AWS NAT and Elastic IP
- Palo Alto NGFW and Cisco ASA
- Cisco Viptela and Meraki SD-WAN
- Cisco Catalyst and Nexus switches
- Cisco and Aruba wireless
- Switching and routing
- MS Visio
- High-level design (HLD)
- Low-level design (LLD)
- Change management
- Rollout planning
- Technical documentation
Certification
- Cisco CCNP
- AWS Solutions Architect
Languages
- English
- Tamil
- Telugu
Personal Information
Title: Lead Network & Cloud Security Engineer
Selected Project Portfolio
- Hyderabad City Surveillance: Designed and implemented datacenter and command control center networking with routing, VLANs, multicast, VPN, NAT, and high availability.
- Mumbai City Surveillance: Implemented Tier III datacenter networking with HSRP, BGP, PIM-SM, LACP, Cisco ASA, Firepower, and Firesight.
- Smart City, Jaipur: Planned IP schema and configured Cisco wireless controllers, access points, VSOM, ASA, Firepower, Prime Infrastructure, MSE, and CMX.
- Mumbai International Airport and campus surveillance projects: Integrated CCTV network, installed 80+ Allied Telesis switches, and delivered wired/wireless surveillance connectivity.
Timeline
Lead Engineer
Avantor (VWR Lab Products Pvt Ltd)
05.2019 - Current
Senior Network Engineer
Technosoft Global Services Private Limited
12.2018 - 05.2019
Senior Network Engineer
Netcon Technologies India Pvt Ltd
06.2013 - 11.2018
B.E. - Electronic Communication Engineering
United Institute of Technology
HSC -
Sri Sowdeswari Vidyalaya Matric Hr. Sec. School