Principal SWE (TCP/IP, C coding, Public Cloud)

About Zscaler

Serving thousands of enterprise customers around the world including 40% of Fortune 500 companies, Zscaler (NASDAQ: ZS) was founded in 2007 with a mission to make the cloud a safe place to do business and a more enjoyable experience for enterprise users. As the operator of the world’s largest security cloud, Zscaler accelerates digital transformation so enterprises can be more agile, efficient, resilient, and secure. The pioneering, AI-powered Zscaler Zero Trust Exchange™ platform, which is found in our SASE and SSE offerings, protects thousands of enterprise customers from cyberattacks and data loss by securely connecting users, devices, and applications in any location.

Named a Best Workplace in Technology by Fortune and others, Zscaler fosters an inclusive and supportive culture that is home to some of the brightest minds in the industry. If you thrive in an environment that is fast-paced and collaborative, and you are passionate about building and innovating for the greater good, come make your next move with Zscaler. 

Our Engineering team built the world’s largest cloud security platform from the ground up, and we keep building. With more than 100 patents and big plans for enhancing services and increasing our global footprint, the team has made us and our multitenant architecture today's cloud security leader, with more than 15 million users in 185 countries. Bring your vision and passion to our team of cloud architects, software engineers, security experts, and more who are enabling organizations worldwide to harness speed and agility with a cloud-first strategy.

Join our ZSDK Services team as a Principal Software Engineer to build and enhance our multi-tenant Zero Trust exchange platform, focusing on mobile security. This high-impact role will shape the future of mobile security services, affecting millions of users globally.  Reporting to the Sr. Director of Engineering, you will:

• Deliver highly scalable, cloud-native services that secure mobile applications and protect sensitive data for millions of users globally.
• Design and implement fault-tolerant, multi-tenant systems to ensure reliability, security, and high availability across our global platform.
• Champion best practices in cloud security, driving continuous improvements in performance, monitoring, automation, and resilience.
• Provide hands-on feedback to improve cloud-native skills and align with best practices for scalability and fault tolerance.
• Collaborate across engineering, product, and customer success teams to turn customer needs into scalable, production-ready solutions.

What We’re Looking for (Minimum Qualifications):

• 12+ years of experience in software engineering, with a focus on building cloud-native services and distributed systems.
• Proficiency in C, with additional experience in Python, Go, or Rust.
• Strong knowledge of cloud platforms like AWS, Azure, or GCP, and experience designing multi-tenant solutions.
• Solid understanding of networking protocols and security technologies, including SSL/TLS, API protection, and proxy solutions.
• Experience with CI/CD pipelines, automated testing, and deployment practices.

What Will Make You Stand Out (Preferred Qualifications):

• Advanced degree in Computer Science, Engineering, or a related field.
• Proven success in building large-scale, secure cloud services, achieving 99.99% uptime and supporting millions of concurrent users, with a focus on scalability and high availability.
• Expertise in API security, IDS/IPS frameworks, and distributed security models.

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At Zscaler, we are committed to building a team that reflects the communities we serve and the customers we work with. We foster an inclusive environment that values all backgrounds and perspectives, emphasizing collaboration and belonging. Join us in our mission to make doing business seamless and secure.

Our Benefits program is one of the most important ways we support our employees. Zscaler proudly offers comprehensive and inclusive benefits to meet the diverse needs of our employees and their families throughout their life stages, including:

By applying for this role, you adhere to applicable laws, regulations, and Zscaler policies, including those related to security and privacy standards and guidelines.

Zscaler is committed to providing equal employment opportunities to all individuals. We strive to create a workplace where employees are treated with respect and have the chance to succeed. All qualified applicants will be considered for employment without regard to race, color, religion, sex (including pregnancy or related medical conditions), age, national origin, sexual orientation, gender identity or expression, genetic information, disability status, protected veteran status, or any other characteristic protected by federal, state, or local laws.

See more information by clicking on the Know Your Rights: Workplace Discrimination is Illegal link.

Pay Transparency

Zscaler complies with all applicable federal, state, and local pay transparency rules.

Zscaler is committed to providing reasonable support (called accommodations or adjustments) in our recruiting processes for candidates who are differently abled, have long term conditions, mental health conditions or sincerely held religious beliefs, or who are neurodivergent or require pregnancy-related support.