Principal Engineer - C and TCP/IP at Sonicwall

SonicWall is a cybersecurity forerunner with more than 30 years of expertise and is recognized as a leading partner-first company, ensuring our partners and their customers are never alone in the fight against cybercrime. With the ability to build, scale and manage security across the cloud, hybrid and traditional environments in real-time, SonicWall provides relentless security against the most evasive cyberattacks across endless exposure points for increasingly remote, mobile and cloud-enabled users. With its own threat research center, SonicWall can quickly and economically provide purpose-built security solutions to enable any organization—enterprise, government agencies and SMBs—around the world. For more information, visit www.sonicwall.com or follow us on Twitter, LinkedIn, Facebook and Instagram. We are seeking a highly experienced Principal Software Engineer to help advance the next generation of network security products. In this role, you will work on high-performance deep packet inspection, intrusion prevention, and advanced threat protection technologies that protect customers across complex, real-world network environments. This is a senior, hands-on engineering role for someone who enjoys solving challenging problems, working with low-level network protocols, and building robust, scalable security features that operate at massive scale. Responsibilities • Design and enhance the high-performance, reassembly-free Deep Packet Inspection engine • Develop and improve Intrusion Prevention, Gateway Anti-Virus, and related next-generation firewall features • Design and implement advanced malware sandboxing and threat protection capabilities • Write clean, efficient, well-documented code and maintain it using industry-standard source control tools • Participate in architecture discussions, code reviews, and performance optimization initiatives Requirements • 10+ years of professional software engineering experience with a Bachelor’s, Master’s, PhD, or equivalent practical experience (post-graduate degree preferred) • Minimum of 5 years of professional experience in C programming, with a strong emphasis on data structures and algorithms. • Solid understanding of TCP/IP networking concepts and protocol behavior • Strong background in Unix or Linux systems development environments • Excellent written and verbal communication skills, including analytical and critical-thinking ability • Strong attention to detail — include the phrase “IDP/GAV” in your final application response • Proven ability in problem-solving, debugging, and software testing • Self-driven, highly motivated, and able to work independently while contributing to team goals Preferred Qualifications • Deep knowledge of Layer 3–Layer 7 protocols (HTTP, SMTP, FTP, TLS, SSH, etc.) • Experience working with firewalls or embedded systems development • Knowledge of pattern-matching or compression algorithms • Experience working with state machines or computational theory concepts • Ability to thrive in a fast-paced environment while managing multiple priorities #LI-KB7 #LI-Hybrid #C #Networking #TCP/IP #Linux #Development #Developer 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