Asst.Manager- Network Operations & Support - Linux firewall engineer (Bangalore)

Job Description:

Network Operations & Support - Linux firewall engineer

Experience: 6-8 Years

Location: Chennai/Bangalore

Role Summary:

We are looking for a skilled Distributed Perimeter (Linux Firewall Engineer) to design, build and operate secure Linuxbased perimeter controls. The role requires strong handson experience with NixOS, nftables and proxy technologies, along with modern networking, container networking, and security observability tools such as Cilium, Suricata, and Zeek. The engineer will be responsible for implementing declarative, scalable, and securityfocused Linux infrastructure.

Key Responsibilities:

• Install, configure, and maintain Linux systems in production environments
• Design and implement distributed perimeter security using Linux firewall and proxy technologies
• Build and manage systems using NixOS (MUST) with declarative configuration principles
• Implement and troubleshoot Linux firewall rules using nftables (MUST)
• Deploy, configure, and manage proxy solutions, including:
• Squid Proxy (MUST)
• Sproxy
• Enforce inbound and outbound traffic control using firewall and proxy policies
• Deploy and support Cilium for container networking, security, and observability
• Configure and operate network security and visibility tools, including:
• Suricata (IDS/IPS)
• Zeek (network traffic analysis)
• Monitor system and network behavior, troubleshoot incidents, and perform rootcause analysis
• Ensure system hardening, security compliance, and best practices
• Collaborate with Security, Platform, and DevOps teams on perimeter and network security improvements
• Document firewall rules, proxy configurations, and operational procedures

Mandatory Skills & Experience:

• 4+ years of handson Linux administration / engineering experience
• Strong experience with NixOS (MUST)
• Strong handson experience with nftables (MUST)
• Handson experience with Squid Proxy (MUST)
• Experience working with Sproxy
• Strong understanding of Linux networking fundamentals (TCP/IP, routing, packet flow)
• Experience implementing firewall and proxybased security controls in production
• Good troubleshooting and incident handling skills

Required / Core Skills:

• Experience with Cilium for container networking and security
• Familiarity with Suricata for intrusion detection/prevention
• Familiarity with Zeek for network traffic analysis and visibility
• Understanding of distributed or zerotrust perimeter concepts
• Scripting skills (Bash required Python preferred)

Preferred Skills:

• Experience with Kubernetes or containerized environments
• Exposure to observability, logging, or SIEM integrations
• Experience working in highavailability or largescale Linux environments
• Securityfocused Linux deployments

Other Qualification and requirement:

Any degree or relevant education is must. This role requires working at customer locations based on business needs.