Software Dev Principal Engineer - DPI & SSL/TLS Security

For more than 30 years, SonicWall has delivered a partner\-first unified cybersecurity portfolio that helps SMBs, MSPs, and IT teams consolidate network security, endpoint security, security service edge (SSE), and threat response across hybrid environments. By bringing connected technology, real\-time threat intelligence, automation, and expert services together, SonicWall helps organizations simplify security operations, achieve better security outcomes, and lower total cost of ownership. Backed by a global ecosystem of more than 17,000 partners, SonicWall delivers enterprise\-grade protection built for SMB and mid\-market realities.

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• *About the Role**

We are seeking a **Principal Engineer** to lead the architecture and development of **Deep Packet Inspection (DPI) and SSL/TLS Decryption** engines for our NGFW appliance and virtual firewall product lines. You will drive the design of high\-throughput L7 inspection and threat prevention capabilities — including Anti\-Virus, Anti\-Spyware, IPS, Content Filtering, and Application Control — at scale across 10G–100G\+ deployments.

• *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.

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