Principal Machine Learning Engineer

ZscalerSan Jose, California, USA

On-site Full-time

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Qualifications

Proven experience in designing and implementing machine learning algorithms and models, strong programming skills in Python, Java, or similar languages, expertise in cloud-based ML services (AWS, Azure, GCP), familiarity with cybersecurity concepts and practices, excellent problem-solving abilities, and a collaborative mindset.

About the job

About Zscaler

Zscaler stands as a trailblazer and global authority in zero trust security. Renowned enterprises, critical infrastructure entities, and government bodies rely on Zscaler to safeguard users, branches, applications, data, and devices while propelling digital transformation efforts. With a presence in over 160 data centers worldwide, the Zscaler Zero Trust Exchange platform, bolstered by cutting-edge AI, addresses billions of cyber threats and policy violations daily, enhancing productivity for modern businesses by minimizing costs and complexities.

At Zscaler, the impact of your role supersedes titles, and trust is cultivated through results. We embrace transparency and prioritize constructive, honest discussions, our goal is to swiftly arrive at the best ideas. Our high-performing teams are designed to create significant impact quickly and with utmost quality. We are nurturing a culture of execution centered on customer obsession, collaboration, ownership, and accountability.

We advocate for an “AI Forward, People First” philosophy to foster acceleration and innovation, empowering our workforce to realize their full potential. If you are motivated by purpose, excel in tackling complex challenges, and aspire to make a positive global impact, we encourage you to join Zscaler in shaping the future of cybersecurity.

Role

We are seeking a Principal Machine Learning Engineer to be a vital part of our ML/AI team. This hybrid position is based in San Jose, CA, reporting directly to the VP of AI and ML within the Engineering department.

You will spearhead innovation within our expanding ML/AI team, concentrating on pivotal cybersecurity use cases, including agentic frameworks, threat detection, and anomaly detection. Your contributions will empower organizations globally to leverage speed and agility through a cloud-first strategy while addressing intricate security challenges at scale.

What you’ll do (Role Expectations)

Lead the design and development of state-of-the-art, production-ready AI/ML systems and pipelines, cybersecurity applications, and provide technical mentorship to junior and mid-level engineers.
Enhance existing machine learning pipelines for improved efficiency and performance.

About Zscaler

Zscaler is a forward-thinking leader in the realm of zero trust security, empowering organizations to navigate the complexities of cybersecurity with innovative solutions. We prioritize our people, fostering a culture of transparency, accountability, and collaboration to ensure that our teams can make significant contributions to the cybersecurity landscape.

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AI Staff Machine Learning Engineer - General AI, ML & Big Data

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Apr 9, 2026

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Full-time|On-site|San Jose

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Feb 12, 2026

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Staff Artificial Intelligence Research Engineer

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Full-time|$240K/yr - $252K/yr|On-site|San Jose, California, United States

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May 1, 2026

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Principal Machine Learning Engineer

Zscaler

On-site|On-site|San Jose, California, USA

About ZscalerZscaler stands as a trailblazer and global authority in zero trust security. Renowned enterprises, critical infrastructure entities, and government bodies rely on Zscaler to safeguard users, branches, applications, data, and devices while propelling digital transformation efforts. With a presence in over 160 data centers worldwide, the Zscaler Zero Trust Exchange platform, bolstered by cutting-edge AI, addresses billions of cyber threats and policy violations daily, enhancing productivity for modern businesses by minimizing costs and complexities.At Zscaler, the impact of your role supersedes titles, and trust is cultivated through results. We embrace transparency and prioritize constructive, honest discussions—our goal is to swiftly arrive at the best ideas. Our high-performing teams are designed to create significant impact quickly and with utmost quality. We are nurturing a culture of execution centered on customer obsession, collaboration, ownership, and accountability.We advocate for an “AI Forward, People First” philosophy to foster acceleration and innovation, empowering our workforce to realize their full potential. If you are motivated by purpose, excel in tackling complex challenges, and aspire to make a positive global impact, we encourage you to join Zscaler in shaping the future of cybersecurity.RoleWe are seeking a Principal Machine Learning Engineer to be a vital part of our ML/AI team. This hybrid position is based in San Jose, CA, reporting directly to the VP of AI and ML within the Engineering department.You will spearhead innovation within our expanding ML/AI team, concentrating on pivotal cybersecurity use cases, including agentic frameworks, threat detection, and anomaly detection. Your contributions will empower organizations globally to leverage speed and agility through a cloud-first strategy while addressing intricate security challenges at scale.What you’ll do (Role Expectations)Lead the design and development of state-of-the-art, production-ready AI/ML systems and pipelines, cybersecurity applications, and provide technical mentorship to junior and mid-level engineers.Enhance existing machine learning pipelines for improved efficiency and performance.

Feb 3, 2026

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