Senior Software Engineer — Embedded C / Firewall Client

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Skills you'll use

What you'll do

• Maintain, harden, and extend the CFS client module across both the control plane and data plane.
• Own the binary UDP protocol implementation between the firewall and the CFS rating servers, ensuring correctness and compatibility across protocol versions.
• Develop and maintain complete IPv4 and IPv6 support across all code paths.
• Own the firmware upgrade and migration paths, ensuring they are atomic, failure-safe, and correctly handle all supported version transitions.
• Improve reliability of inter-blade cache synchronization on multi-blade appliances.
• Collaborate with the server-side on coordinated protocol changes.
• Document the concurrency model, upgrade invariants, and dataplane integration for long-term maintainability.
• Collaborate asynchronously with a US-based team and the India-based server team.

Who can apply

• Expert-level C (not C++): disciplined manual memory management, pointer arithmetic, and systems design.
• Multi-core concurrency in C : reader-writer locks, spinlocks, atomic operations, and memory ordering.
• Kernel-level networking : deep understanding of how a packet moves through a firewall dataplane — TCP/UDP processing, flow cache, connection tracking. Userspace socket programming alone is not sufficient.
• Strong IPv4 and IPv6 across all code paths.
• Comfortable navigating and owning a large C codebase with multiple subsystems.
• Experience with network testing and debugging tools: packet capture (Wireshark/tcpdump), traffic generators, GDB.
• Good written English for remote, asynchronous collaboration.

About SonicWall

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