IT - Technology Specialist - IT Service, Support and Operations | Telecom | OSS/BSS

Job title: Linux Network Engineer Duration of the project: 12 Work Location with Zip code: 1800 Arch St, Philadelphia PA 19103 Please confirm if this would be onsite from day one OR Initial remote for 2-3 months and then expecting candidate to work from office OR 100% Remote: Onsite from day one Is this an 100% remote role? NO Vendor Rate Range (min to max rate you can offer): 60-65 Do you have budget approved for this request? Yes Minimum years of experience required: 6 Would you require the candidates to meet you for in person interview? If required Is Skype/WebEx interview, OK? Yes Please Confirm Must Have Skills (TOP 3 SKILLS) 6+ years Linux Systems or Network Engineering experience Experience working with GRE tunnels on Linux Strong packet capture and analysis skills using tcpdump, Wireshark/tshark Proficient with Bash and Python scripting Strong knowledge of iproute2, nftables/iptables, and tc Solid understanding of L2 L4 protocols, DSCP/QoS, and MTU mechanicsRole OverviewWe are seeking an experienced Linux Network Engineer (Infosys Contractor) with strong scripting and packet analysis skills to support deep inspection of GRE tunnel traffic in a large scale, production network. The engineer will develop automation to extract, filter, and analyze encapsulated packets, and support operational troubleshooting for GRE related issues across the XWIFI Core Network.This role requires expertise in Linux networking, GRE/ERSPAN, packet capture, filtering frameworks (nftables/iptables, tc), and scripting (Python/Bash). The contractor will collaborate closely with Comcast engineering teams while remaining an Infosys resource.Key Responsibilities Develop Python/Bash scripts to inspect GRE tunnels and decapsulate/analyze encapsulated payloads Build automated capture flows using tcpdump, tshark, and libpcap Implement payload-aware filtering logic using nftables/iptables, tc (flower/clsact), and eBPF/XDP Troubleshoot GRE tunnel health, encapsulation/decapsulation errors, MTU/fragmentation issues, and offload behavior Create and maintain operational runbooks and documentation Integrate capture data and metrics with observability platforms (Prometheus, Grafana, ELK) Participate in on-call rotations as neededMinimum Qualifications 6+ years Linux Systems or Network Engineering experience Experience working with GRE tunnels on Linux Strong packet capture and analysis skills using tcpdump, Wireshark/tshark Proficient with Bash and Python scripting Strong knowledge of iproute2, nftables/iptables, and tc Solid understanding of L2 L4 protocols, DSCP/QoS, and MTU mechanicsPreferred Qualifications ERSPAN (Type II/III) decoding experience GRE over IPv6 and GRE inside IPsec (xfrm) High rate packet capture frameworks such as PF_RING, DPDK, AF_PACKET Experience with eBPF-based tracing tools such as bpftrace and XDP loaders Experience writing CLI utilities in Python Prior experience supporting ISP/carrier environmentsSuccess Metrics for the 1 2 Year Engagement0 30 Days: Deliver GRE discovery and validation scripts Provide assessment of GRE visibility and tunnel health30 90 Days: Implement automated selective payload capture workflows Produce updated dashboards and observability integrations90 180 Days: Implement traffic filtering policies (nftables/tc) for GRE payload handling Build mature troubleshooting runbooks6 24 Months: Harden capture and inspection pipelines for scale Lead GRE related diagnostics during incidents Support ongoing enhancements and network transformation initiativesContractor Expectations (Infosys-Specific) Must comply with Comcast engineering, documentation, and security standards Automation must include clear comments and handoff-ready documentation Daily work tracking via Jira and documentation in Confluence Collaborate effectively with Comcast and Infosys distributed teams