Sr. Software Engineer (Windows, C++, C#)

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.

We’re looking for an experienced Senior Software Engineer to join our Mobile Team.  You’ll lead the development of cross-platform client applications (Windows, MacOS, Android, iOS, and Linux) that securely steer endpoint traffic to the Zscaler cloud. As the Microsoft Windows programming domain expert, you’ll play a key role in designing and implementing innovative solutions that enhance secure internet and enterprise connectivity.  Reporting to the Director of Engineering, this is a hybrid role requiring three days per week in our San Jose, CA office.  In this role, you will:

• Lead the design and development of endpoint security solutions for Windows using the latest software techniques.
• Collaborate with Product Management to refine requirements and deliver solutions aligned with customer needs.
• Develop and execute unit tests, partnering with QA to improve test routines, and ensuring high-quality product releases.
• Troubleshoot and resolve customer issues while driving continuous improvement in product reliability.
• Provide technical leadership across the product development lifecycle, from scoping and planning to deployment and ongoing engineering.

What We’re Looking for (Minimum Qualifications):

• 5+ years of software engineering experience with a focus on Microsoft Windows.
• Advanced proficiency in C++ and C#.
• Strong knowledge of Windows desktop application development and tools like Visual Studio, WinDBG, Wireshark, and Fiddler.
• Excellent oral and written communication skills.

What Will Make You Stand Out (Preferred Qualifications):

• Demonstrated expertise in architecting, designing, and debugging complex networking features on Windows.
• Familiarity with security concepts such as PKI, VPNs, or firewalls.
• Knowledge of networking technologies, including IP, TCP, HTTP, and SSL protocols.

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