Principal Software Engineer, Windows Driver

About Zscaler

Serving thousands of enterprise customers around the world including 45% 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 65 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 Principal Software Engineer to join our Endpoint Engineering team. This high-impact role will shape the future of mobile security services, affecting millions of users globally. Reporting to the Sr. Manager, Software Development Engineering, you will be responsible for:

• Developing Windows Device Drivers primarily Network Filter drivers and Windows Filtering Platform drivers to intercept network traffic


• Improving the code quality and to build solid, testable, and well-documented features


• Making significant contributions to the design and implementation of major development projects, and working closely with our product managers and other teams to implement customer-impacting features


• Collaborating with internal Zscaler teams as the domain expert for Client platform and help resolve customer deployment issues

What We're Looking for (Minimum Qualifications)

• 10+ years of software engineering experience with expertise in lower-level languages like C and C++, alongside in-depth knowledge of Windows internals, kernel-mode programming, and network protocols


• Proficient in low-level Windows driver development, particularly network drivers, with strong debugging skills for network-related problems


• Comprehensive understanding of L2/L3 networking protocols and services, including DNS, DHCP, TCP/IP, and SSL/TLS


• Skilled at writing high-quality, well-documented code with low complexity and excellent programming practices


• Bachelor’s degree in computer science or a related field

What Will Make You Stand Out (Preferred Qualifications)

• Additional experience in macOS, Android, iOS or Linux


• Mobile device Management (MDM) and Enterprise Mobility Management (EMM)

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Zscaler’s salary ranges are benchmarked and are determined by role and level. The range displayed on each job posting reflects the minimum and maximum target for new hire salaries for the position across all US locations and could be higher or lower based on a multitude of factors, including job-related skills, experience, and relevant education or training.

The base salary range listed for this full-time position excludes commission/ bonus/ equity (if applicable) + benefits.

Base Pay Range

$182,000 - $260,000 USD

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:

• Various health plans


• Time off plans for vacation and sick time


• Parental leave options


• Retirement options


• Education reimbursement


• In-office perks, and more!

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.