Senior Software Engineer - IGP Protocol Development

Key Responsibilities

• Implement the OSPF v2/v3 protocol stack - neighbor state machine, LSA processing, SPF algorithm, area support
• Implement the IS-IS protocol stack - adjacency formation, LSP generation/flooding, TLV encoding, route calculation
• Implement multi-area routing, route summarization, authentication, and graceful restart; integrate with RIB/FIB
• Write and test C/C++ code, debug protocol issues with Wireshark/GDB/tcpdump, and profile for performance
• Mentor 2-3 junior engineers, review their code, and collaborate with the Principal Engineer on design decisions

Requirements

• Strong understanding of TCP/IP networking fundamentals and routing concepts
• Hands-on experience implementing or debugging network protocols in production environments
• Experience with the Linux networking stack and systems programming

Nice to Have

• Experience in networking open-source projects
• Experience with OSPF-SR or IS-IS-SR extensions for Segment Routing
• Familiarity with network simulators (GNS3, Containerlab)
• Understanding of BFD (Bidirectional Forwarding Detection) for fast failure detection
• Knowledge of Python for test automation and tooling
• Experience with CI/CD pipelines and automated testing

Key Skills

• C/C++
• OSPF (RFC 2328/5340)
• IS-IS (ISO 10589)
• Dijkstra/SPF
• Wireshark
• GDB
• Valgrind
• Netlink
• Git

What You ll Gain

• Work on cutting-edge network operating system used in carrier-grade deployments
• Learn from experienced Principal Engineers and System Architects
• Deep technical expertise in routing protocols and network systems programming
• Opportunity to influence protocol architecture and design decisions
• Career growth path to Lead Engineer and Principal Engineer roles
• Collaborative environment with focus on technical excellence

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