Senior Network Engineer: Enterprise Design, Troubleshooting & Security

Tata Consultancy Services Limited; St. Louis (MO); On-site; USD 100,000 - 120,000; Full time

Benefits offered by this job

Discretionary Annual Incentive

Medical Coverage: Medical & Health, +/

Family Support: Leaves

401K Plan

Training Reimbursement

Vacation & Holidays

Job summary

Tata Consultancy Services Limited in Saint Louis, MO, is seeking an IT Network Engineer 3 to design, configure, and enhance enterprise LAN/WAN/WLAN infrastructure. You will translate business needs into scalable network solutions and lead ongoing improvements across complex production environments.

The role requires 5+ years of hands‑on experience with routing/switching, security controls, and network diagnostics, plus strong communication skills.

Qualifications

• 5+ years of related experience designing, implementing, supporting, and improving enterprise network infrastructure.
• Strong knowledge of TCP/IP, IPv4/IPv6, DNS, DHCP, VLANs, STP, NAT, ACLs, and subnetting.
• Hands‑on expertise with enterprise routing and switching, including BGP and OSPF.
• Experience supporting LAN, WAN, WLAN, and complex production network environments.
• Working knowledge of firewalls, VPNs, network segmentation, access controls, and network security principles.
• Strong troubleshooting skills using packet analysis, logs, monitoring platforms, and diagnostic tools.
• Experience with network monitoring, capacity management, performance management, availability management, and root‑cause analysis.
• Ability to create and maintain network diagrams, implementation plans, standards, procedures, configuration records, and troubleshooting guides.
• Experience supporting complex infrastructure projects, production changes, and service‑impacting incidents.
• Exposure to network automation or scripting using Python, PowerShell, or Ansible is preferred.
• Relevant certifications such as Cisco CCNP, Cisco CCNA, or comparable industry certifications are desirable.
• Strong written and verbal communication skills with the ability to explain risks, dependencies, technical decisions, and implementation status.

Responsibilities

• Design, configure, implement, and enhance enterprise LAN, WAN, WLAN, routing, switching, and associated network infrastructure.
• Translate business and technical requirements into scalable, secure, resilient network solutions.
• Lead implementation, maintenance, troubleshooting, and continuous improvement of enterprise network services.
• Diagnose and resolve complex connectivity, availability, performance, and configuration issues.
• Monitor network health, capacity, availability, and performance and recommend preventive or corrective improvements.
• Provide advanced support for network incidents and service‑impacting events and participate in root‑cause analysis.
• Plan and execute network changes while minimizing operational risk and service disruption.
• Incorporate security and compliance requirements into network engineering and operational activities.
• Develop and maintain network diagrams, standards, implementation procedures, operating guides, and technical documentation.
• Provide network expertise to infrastructure and technology projects and contribute to complex transformation initiatives.
• Collaborate with architects, cybersecurity, application teams, telecommunications providers, customers, and technology vendors.
• Act as a subject‑matter expert across multiple network technologies and guide junior engineers on complex assignments.

Skills

TCP/IP

IPv4/IPv6

DNS

DHCP

VLANs

STP

NAT

ACLs

Subnetting

Routing & Switching

BGP

OSPF

LAN/WAN/WLAN

Firewalls & VPNs

Network security principles

Packet analysis

Monitoring platforms

Root‑cause analysis

Network diagrams

Python

PowerShell

Ansible

Cisco CCNP

Cisco CCNA

Tools

Python

PowerShell

Ansible

Job description

Tata Consultancy Services Limited in Saint Louis, MO, is seeking an IT Network Engineer 3 to design, configure, and enhance enterprise LAN/WAN/WLAN infrastructure. You will translate business needs into scalable network solutions and lead ongoing improvements across complex production environments.

The role requires 5+ years of hands‑on experience with routing/switching, security controls, and network diagnostics, plus strong communication skills.