AI Engineer - AI Security

About Zscaler

Zscaler accelerates digital transformation so our customers can be more agile, efficient, resilient, and secure. Our cloud native Zero Trust Exchange platform protects thousands of customers from cyberattacks and data loss by securely connecting users, devices, and applications in any location.

Here, impact in your role matters more than title and trust is built on results. We believe in transparency and value constructive, honest debate—we’re focused on getting to the best ideas, faster. We build high-performing teams that can make an impact quickly and with high quality. To do this, we are building a culture of execution centered on customer obsession, collaboration, ownership and accountability. 

We value high-impact, high-accountability with a sense of urgency where you’re enabled to do your best work and embrace your potential. If you’re driven by purpose, thrive on solving complex challenges and want to make a positive difference on a global scale, we invite you to bring your talents to Zscaler and help shape the future of cybersecurity.

Role

We are looking for an AI Engineer - AI Security to join our AI Security department on-site in Zagreb or Split, reporting to the Sr. Director of Engineering - AI Red Team.

In this role, you will help accelerate growth in the highly competitive world of AI cybersecurity as a member of our Croatia-based team. You will drive a critical partnership between offensive security and machine learning to ensure our systems remain resilient, secure, and ethical.

What you’ll do (Role Expectations)

• Lead the design, planning, and hands-on execution of red team exercises against generative AI systems, probing for prompt injection, adversarial inputs, and broader misuse vectors
• Continuously track advances in AI security, adversarial ML, and responsible/ethical AI to strengthen methodologies and guardrails
• Convert the latest academic and industry findings into actionable test cases, tools, and evaluation procedures while validating their effectiveness
• Define measurable KPIs and success criteria for red team engagements and report findings with clear remediation guidance
• Review and score samples of automatically generated attack scenarios against a defined rubric to assess tool quality, identify gaps, and guide iterative improvements

Who You Are (Success Profile)

• You thrive in ambiguity. You're comfortable building the path as you walk it and see dynamic environments as the raw material to build something meaningful.
• You act like an owner. Your passion for the mission fuels your bias for action and you navigate seamlessly between high-level strategy and hands-on execution.
• You are a problem-solver. You seek out challenges because you are energized by finding solutions, knowing that solving the hard problems delivers the biggest impact.
• You are a high-trust collaborator. You are ambitious for the team, not just yourself, and you embrace a challenge culture by giving and receiving ongoing feedback to earn trust.
• You are a learner. You have a true growth mindset and never stop developing yourself, actively seeking feedback to become a better partner and a stronger teammate.

What We’re Looking for (Minimum Qualifications)

• Professional experience working with Python and Large Language Models (LLMs)
• Proficiency with REST APIs and technical tools like cURL or Postman
• Foundational familiarity with major cloud platforms such as AWS, Azure, or GCP
• Practical experience or strong knowledge in AI Red Teaming, Machine Learning, or Deep Learning

What Will Make You Stand Out (Preferred Qualifications)

• B.S. in Computer Science, Engineering, or equivalent practical experience
• Proven experience in machine learning, big data engineering, or AI algorithm development
• Deep technical knowledge in Generative AI, cybersecurity, or adjacent technical domains

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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.