Software Dev Principal Engineer - DPI & SSL/TLS Security

SonicWall; Pune District; On-site; INR 1,500,000 - 3,200,000; Full time

Job summary

SonicWall in Pune, India seeks a Software Dev Principal Engineer with DPI experience to lead architecture and development for DPI and SSL/TLS decryption engines across NGFW appliances and virtual firewall lines.

You will drive high-throughput L7 inspection, threat prevention capabilities, and hardware-accelerated cryptographic workloads while aligning with security service integration and cryptographic standards.

Qualifications

• 10+ years of C/C++ experience in high-performance networking or L7 security engines.
• Strong expertise in SSL/TLS internals (TLS 1.2/1.3, PKI, cert management).
• Hands-on experience building or optimizing DPI or security service engines on NGFW platforms.

Responsibilities

• Architect and evolve the DPI engine for multi-gigabit L7 inspection on NGFW appliances.
• Lead design of the SSL/TLS decryption pipeline for security services inspection over encrypted traffic.
• Define integration strategy between decryption layer and downstream security services (AV, IPS, content filtering, app control).
• Drive hardware acceleration strategy for cryptographic and pattern-matching workloads.
• Champion security hardening practices and ensure cryptographic standards compliance.
• Own architecture reviews, write technical specs, define performance benchmarks, mentor engineers.

Skills

C/C++

High-performance networking

L7 security engines

SSL/TLS internals

DPI engines

Education

Bachelor’s degree in CS/EE

Tools

OpenSSL/BoringSSL

Job description

Software Dev Principal Engineer - DPI experience is a must*

Pune, Maharashtra, India

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.

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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