Principal Engineer - Firewall/Web Proxy

Engineering San Jose, California


Position: Principal Software Engineer

Location: San Jose, CA

For over 10 years, Zscaler has been disrupting and transforming the security industry. Our 100% purpose built cloud platform delivers the entire gateway security stack as a service through 150 global data centers to securely connect users to their applications, regardless of device, location, or network in over 185 countries protecting over 4,500 companies and 100 Million threats detected a day.

We work in a fast paced, dynamic and make it happen culture. Our people are some of the brightest and passionate in the industry that thrive on being the first to solve problems.  We are always looking to hire highly passionate, collaborative and humble people that want to make a difference.  

We are looking for a talented, high-energy, team player to be part of a team developing a Firewall and Web proxy solution delivered as a service through the cloud. 


  • 12+ years software development experience in large-scale commercial networking oriented applications
  • Experience in Load balancers, IPS/IDS, Routers, Firewall products in multi-threading / multi-core / fault tolerant real-time embedded platforms.
  • Expert-level programming skills in C/UNIX/RTOS 
  • Strong in fundamentals - TCP/IP, High performance Computing, Event based programming, Fault Tolerance etc.
  • Familiar with complete software development cycle
  • Self-starter, quick-learner, able to multi-task, and collaborate with others in a team environment
  • BS/MS degree  (Engineering/Computer Science)

Desired skills:

  • Experience with FreeBSD based networking solutions
  • Knowledge of HTTP and web proxies
  • Experience in Cloud based Networking solutions is plus
  • Some small company/startup experience 

Why Zscaler?

People who excel at Zscaler are smart, motivated and share our values. Ask yourself: Do you want to team with the best talent in the industry? Do you want to work on disruptive technology? Do you thrive in a fluid work environment? Do you appreciate a company culture that enables individual and group success and celebrates achievement? If you said yes, we’d love to talk to you about joining our award-winning team.

Learn more at or follow us on Twitter @zscaler. Additional information about Zscaler (NASDAQ : ZS) is available at  All qualified applicants will receive consideration for employment without regard to race, sex, color, religion, sexual orientation, gender identity, national origin, protected veteran status, or on the basis of disability.