Software Engineer - C/C++ Networking(Layer2/Layer 3) | 4-8 Years

Meet the Team

Cisco Networking builds industry-leading switching, routing, wireless, and cloud-managed networking solutions used by customers worldwide. We are looking for a hands-on senior firmware engineer with strong systems programming and networking expertise to help develop the next generation of high-performance switching software.

Join the Network Connectivity team, where you will design and develop production-grade firmware and system software for enterprise switching platforms. As a Senior Software Engineer, you will independently own significant features, contribute to technical design and architecture decisions, and work closely with networking, platform, quality, and product teams.

Your Impact

In this role, your work will directly enhance the connectivity, reliability, and configuration of L2/L3 protocols on Cisco switching platforms. You will own medium-to-large features from design through delivery, troubleshoot complex device and customer issues, and help raise the engineering bar through strong technical judgment and mentorship.

Responsibilities

· Design, develop, and own networking components that are simple, scalable, reliable, and supportable. Develop firmware and system software for Cisco switching products.

· Analyze requirements and problem statements, evaluate technical trade-offs, and produce clear software designs, detailed design documents, and functional specifications.

· Write high-quality C/C++ code and unit tests. Apply strong white-box testing and automation practices. Triage, debug, and root-cause software bring-up issues, regressions, crashes, performance problems, and customer failures.

· Work with local and remote teams to review product requirements, software functional/design specifications, unit and integration test plans, and validation strategy. Partner closely with system test and quality teams to ensure feature readiness.

· Contribute innovative ideas that improve product architecture, debuggability, performance, reliability, and engineering productivity, including opportunities to create intellectual property.

Minimum Qualifications:

· Bachelor's or Master's degree in Computer Science, EE/ECE, or a related field, with typically 4-8 years of relevant software/firmware development experience.

· Strong hands-on proficiency in C/C++ with solid data structures, algorithms, object-oriented design, memory management, and debugging skills.

· Hands-on experience developing firmware, embedded software, or system software for networking products.

· Strong experience with concurrent programming, multithreading, synchronization, and IPC/RPC mechanisms.

· Strong L2/L3 networking knowledge, including Ethernet, VLANs, STP/RSTP, LACP/LAG, ARP, IPv4/IPv6, routing fundamentals, packet flow, and network troubleshooting.

· Strong Linux/system programming fundamentals and hands-on debugging experience using tools such as GDB, core dumps, packet captures, Wireshark/tcpdump, and traffic generators/analyzers such as IXIA or equivalent.

· Demonstrated ownership of medium-to-large technical features, including design, implementation, testing, rollout, and production/customer support. Ability to mentor engineers and contribute effectively to design and code reviews.

· Hands-on experience using GenAI-assisted development tools such as Codex, GitHub Copilot, Claude, or equivalent to improve engineering productivity while maintaining code quality and security.

Preferred Qualifications:

· Hands-on development and debugging experience with networking protocols and switching features such as VLAN, STP/RSTP/MST, LACP/LAG, UDLD, Storm Control, QoS, OSPF, BGP, ECMP, multicast, DHCP relay, SLAAC, or VRRP.

· Experience with Python or another scripting language for test automation, debugging, tooling, or developer productivity.

· Experience with hardware/software bring-up, SDK/ASIC interaction, packet processing, or high-performance data-plane software is a plus. Cisco networking certifications such as CCNA, CCNP, or CCIE are desirable.

Why Cisco?

At Cisco, we’re revolutionizing how data and infrastructure connect and protect organizations in the AI era – and beyond. We’ve been innovating fearlessly for 40 years to create solutions that power how humans and technology work together across the physical and digital worlds. These solutions provide customers with unparalleled security, visibility, and insights across the entire digital footprint.

Fueled by the depth and breadth of our technology, we experiment and create meaningful solutions. Add to that our worldwide network of doers and experts, and you’ll see that the opportunities to grow and build are limitless. We work as a team, collaborating with empathy to make really big things happen on a global scale. Because our solutions are everywhere, our impact is everywhere.

We are Cisco, and our power starts with you.

Disclaimer

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• be in direct response to an application you have submitted through the company career site
• begin with screening or an interview
• originate from a Cisco email address, and
• be conducted across email, phone, or WebEx

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