Job Title: Senior IT Infrastructure Engineer (Network)

Location: Gurgaon/ Bangalore
Reports To: Manager IT Infrastructure (Networks)
Department: Infrastructure & Operations

Role Overview

We are seeking a Senior IT Infrastructure Engineer (Network) to act as a technical Subject Matter Expert (SME) across enterprise network services, supporting office, data centre, and hybrid cloud networking environments.

This is a hands-on engineering role focused on delivering resilient, secure-by-design, and high-performance network platforms using predominantly Cisco technologies, with exposure to Juniper and cloud-native networking. The role will be critical in ensuring network segmentation, security, and scalability across the organisations global infrastructure.

Key Responsibilities

- Act as a technical SME for network infrastructure, including:
- Office / campus networks
- Data centre networking
- Hybrid cloud connectivity (Azure, GCP)

- Design, implement, and support secure, scalable network solutions across:

- LAN / WAN / Data Centre / Cloud

- Own and optimise Cisco-based network platforms, including:

- Routing and switching
- Cisco ACI (Application Centric Infrastructure)
- Policy-driven segmentation

- Support and manage F5 load balancing platforms, including:

- LTM configuration and optimisation
- Traffic management and application delivery
- High availability and failover design

- Deliver secure-by-design network architecture, including:

- Network segmentation and micro-segmentation
- Zero Trust principles
- Alignment to enterprise security controls

- Design and support hybrid networking solutions, including:

- Connectivity to Azure and GCP




- VPN and private connectivity models (e.g. ExpressRoute, Interconnect)

- Troubleshoot and resolve complex network incidents and performance issues across multi-layer environments
- Drive network automation and standardisation to improve operational efficiency
- Produce and maintain high-quality network documentation, including:

- High-level and low-level designs
- Network diagrams
- Runbooks and operational procedures
- Configuration standards

- Collaborate with:

- Security teams (segmentation, network security controls)
- Cloud engineering teams
- Platform and infrastructure teams

- Participate in the on-call rota to support critical network incidents

Required Skills & Experience

- Strong hands-on experience with:
- Cisco networking technologies (core requirement)
- Data centre networking and Cisco ACI
- F5 load balancing platforms

- Experience with:

- Juniper networking technologies (desirable)
- Hybrid cloud networking (Azure and/or GCP)

- Deep knowledge of:

- Network segmentation and secure network design
- Routing and switching protocols (e.g. BGP, OSPF)
- Layer 47 load balancing concepts
- High availability and resilient design

- Proven ability to design, implement, and support enterprise-scale network environments
- Strong troubleshooting experience across:

- LAN
- WAN




- Data centre fabric
- Hybrid cloud connectivity

Technical Competencies

- Recognised as a network SME within the team
- Ability to lead complex technical delivery and problem resolution independently
- Robust understanding of:
- Secure-by-design networking
- Network segmentation strategies (macro and micro segmentation)
- High availability, resilience, and fault tolerance

- Hands-on experience implementing and operating Cisco ACI environments
- Ability to contribute to design decisions in partnership with architecture teams

Behavioural & Professional Skills

- Ownership & Accountability: Takes responsibility for network stability, performance, and security
- Technical Leadership: Influences engineering standards and solutions without direct line management
- Security Focus: Embeds secure-by-design principles into all network solutions
- Collaboration: Works effectively across infrastructure, security, and cloud teams
- Communication: Clearly articulates technical concepts and designs
- Continuous Improvement: Drives optimisation, automation, and simplification initiatives

Preferred Qualifications

- Certifications such as:
- Cisco (CCNP / CCIE)
- F5 certifications
- Cloud networking certifications (Azure / GCP)

- Exposure to:

- Network automation tools (Ansible, Terraform, etc.)
- Container networking and modern application delivery

Education & Experience

- Degree in Computer Science, Networking, or related field (or equivalent experience)
- 5–8 years of experience in enterprise networking
- Demonstrated experience operating at Senior Engineer (S2) level

📌 Senior IT Infrastructure Engineer (Network) (Gurugram)
🏢 Colt Technology Services
📍 Gurugram