Software Dev Principal Engineer - DPI experience is a must

About the Role

Responsibilities

• Architect and evolve the DPI engine for multi-gigabit stream-based L7 traffic inspection on NGFW appliances.
• Lead design of the SSL/TLS decryption pipeline to enable security services inspection over encrypted traffic.
• Define integration strategy between the decryption layer and downstream security services (AV, IPS, Anti-Spyware, Content Filtering, Application Control).
• Drive hardware acceleration strategy for cryptographic and pattern-matching workloads.
• Champion security hardening practices and ensure compliance with modern cryptographic standards.
• Own architecture reviews, author technical specifications, define performance benchmarks, and mentor senior engineers.

Requirements

• 10+ years of C/C++ experience in high-performance networking, packet processing, or L7 security engines on NGFW or carrier-grade platforms.
• Strong expertise in SSL/TLS internals — TLS 1.2/1.3, PKI, certificate management, and OpenSSL/BoringSSL.
• Hands-on experience building or optimizing DPI or security service engines (AV, IPS, Content Filtering, or Application Control) on commercial NGFW platforms.
• Proficiency in multi-core, low-latency C/C++ programming — concurrency, memory optimization, and zero-copy techniques.
• Strong debugging and profiling skills across complex, multi-threaded networking environments.

Nice to Have

• Familiarity with NGFW security services from leading industry vendors.
• Exposure to modern encrypted protocol standards (HTTP/3, QUIC, DoH, ECH/ESNI).
• Experience with virtual or cloud firewall performance tuning.
• Hands-on with network traffic generation and testing tools (Spirent, IXIA, TRex).
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• SonicWall is an equal opportunity employer.
• We are committed to creating a diverse environment and are an equal opportunity employer. All qualified applicants receive consideration for employment without regard to race, color, ethnicity, religion, sex, gender, gender identity and expression, sexual orientation, national origin, disability, age, marital status, veteran status, pregnancy, or any other basis prohibited by applicable law. At SonicWall, we pride ourselves on recruiting a diverse mix of talented people and providing active security solutions in 100+ countries.
• Applicant Privacy Notice
• We are committed to creating a diverse environment and are an equal opportunity employer. All qualified applicants receive consideration for employment without regard to race, color, ethnicity, religion, sex, gender, gender identity and expression, sexual orientation, national origin, disability, age, marital status, veteran status, pregnancy, or any other basis prohibited by applicable law.
• At SonicWall, we pride ourselves on recruiting a diverse mix of talented people and providing active security solutions in 100+ countries.