Zscaler · 1 month ago
Principal Software Engineer - C, Https, SSL
San Jose, California, USA
Full-time
Hybrid
Lead/Staff
$182K/yr - $260K/yr
10+ years expZscaler accelerates digital transformation through its cloud-native Zero Trust Exchange platform, providing security for users, devices, and applications. The Principal Software Development Engineer will drive technical strategy, set engineering standards, and mentor other engineers while ensuring exceptional customer outcomes.
Cloud SecurityCyber SecurityEnterprise SoftwareSecurity
Responsibilities
Designing, implementing, and optimizing high‑performance network applications and protocols using C and Python
Architecting and scaling distributed systems across multiple data centers with stringent performance, resiliency, and multi-tenant requirements
Working within Linux environments to perform system programming, scripting, and troubleshooting
Contributing to and guiding key domains including post‑quantum cryptography, Network Detection & Response (NDR), Zscaler Digital Experience (ZDX), and Zscaler OS
Collaborating with teams to define requirements, design architectures, and ensure reliable software through testing and debugging
Qualification
Required
10+ years of hands‑on C programming experience on Unix/FreeBSD/Linux in distributed, enterprise‑scale environments
Proven expertise in high availability design, failover redundancy, load balancing, and performance optimization, with strong familiarity in SLOs, observability, and capacity planning for 24×7 services
Deep understanding of networking protocols and services: DNS, HTTP/2, QUIC, TCP/IP, and SSL/TLS
Experience with security technologies (firewall, IPS, authentication) and networking technologies (VPN/IPSec, data‑plane traffic forwarding)
Proficiency in troubleshooting network issues using tools such as Wireshark, tcpdump, curl, and wget
Preferred
Experience with Python, Go, or Rust for systems and network programming
Track record of staying current with industry trends and proposing improvements to reliability, scalability, and network efficiency
Proficiency with AI code‑assistance tools (e.g., Windsurf, Cursor, GCA, Claude) to accelerate development, refactoring, unit testing, and troubleshooting
Benefits
Various health plans
Time off plans for vacation and sick time
Parental leave options
Retirement options
Education reimbursement
In-office perks, and more!
Company
Zscaler
Zscaler is a global cloud-based information security company that enables secure digital transformation for mobile and cloud.
5001-10000 employees
H1B Sponsorship
Zscaler has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (164)
2024 (220)
2023 (108)
2022 (144)
2021 (82)
2020 (51)
Funding
Current Stage
Public CompanyTotal Funding
$1.67BKey Investors
TPG GrowthLightspeed Venture Partners
2025-07-01Post Ipo Debt· $1.5B
2024-04-23Post Ipo Equity· $22.7M
2018-03-16IPO
Leadership Team
Jay Chaudhry
CEO, Chairman & Founder
Hemant Dabke
Area Vice President
Recent News
GlobeNewswire
2026-01-06
MarketScreener
2026-01-06
2026-01-06
Company data provided by crunchbase