ApplySarthiSoftware Dev Principal Engineer - DPI experience is a must*
SonicWall
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What experience roles keep asking for: Stakeholder management (17%), Product management (14%) — counted across their open postings here.
SonicWall has 53 open roles listed here.
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Counted across 14 company job boards, updated as roles open and close.
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Questions you are likely to be asked
- Why do you want to join SonicWall?
- What is your experience with C++? Tell me one thing you learned the hard way.
- Describe a time a deadline forced a trade-off in quality. What did you choose and why?
- How would you design an API for a feature you have worked on?
- What do you do when a production issue happens on your code?
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Practise the Software Dev Principal Engineer - DPI experience is a must* at SonicWall interview free →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.
For more information, visit www.sonicwall.com or follow us on X, LinkedIn, Facebook, and Instagram.
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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Listed on greenhouse · posted 2026-10-26. ApplySarthi collects openings and links to application pages; the role is advertised by SonicWall, not by us.