Fullstack Engineer at Zscaler

About Zscaler

Zscaler is a pioneer and global leader in zero trust security. The world’s largest businesses, critical infrastructure organizations, and government agencies rely on Zscaler to secure users, branches, applications, data & devices, and to accelerate digital transformation initiatives. Distributed across more than 160 data centers globally, the Zscaler Zero Trust Exchange platform combined with advanced AI combats billions of cyber threats and policy violations every day and unlocks productivity gains for modern enterprises by reducing costs and complexity.

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 champion an “AI Forward, People First” philosophy to help us accelerate and innovate, empowering our people to embrace their 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 to help shape the future of cybersecurity.

Role

We are looking for a Fullstack Engineer 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 by blending expert software engineering with machine learning and an offensive security mindset. You will architect and build our next-generation AI Red Teaming platform, designing scalable systems that support cutting-edge security discovery, testing, and remediation features.

What you’ll do (Role Expectations)

Drive the end-to-end creation of our AI Security Platform, from initial concept to final deployment, while shaping system architecture, engineering resilient microservices, and building sophisticated UI/UX

Dive deep into our system to investigate, debug, and resolve challenging application and infrastructure issues across production and development environments

Develop business value propositions based on customer situations and organizational offerings to drive impact

Work closely with the development team and cross-functional partners to shape the product roadmap based on direct customer needs

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, embracing a challenge culture where candor is delivered with clarity and respect.

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)

Proficiency in software development with C#, Java, or NodeJS and TypeScript, including experience with a modern UI framework such as React or Angular

Foundational knowledge of a major cloud provider (AWS, Azure, or GCP) and familiarity with containerization technologies like Docker and Kubernetes

Understanding of CI/CD principles and familiarity with platforms such as GitHub Actions or GitLab CI/CD

Experience with infrastructure and application monitoring tools such as Grafana, Prometheus, or AWS CloudWatch

What Will Make You Stand Out (Preferred Qualifications)

Direct experience or strong interest in AI Red Teaming, developing agentic systems, or working with large-scale control plane (MCP) server environments

Practical experience with Python scripting

Experience developing integrations against the APIs and webhooks of enterprise tools such as JIRA, GitHub, or Splunk

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!

Learn more about Zscaler’s Future of Work strategy, hybrid working model, and benefits here.

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.

Fullstack Engineer

Job Description