Principal Threat Researcher

Zscaler (NASDAQ: ZS) accelerates digital transformation so customers can be more agile, efficient, resilient, and secure. The Zscaler Zero Trust Exchange platform protects thousands of customers from cyberattacks and data loss by securely connecting users, devices, and applications in any location. Distributed across 200+ public data centers globally and thousands of private sites at the edge, the SASE-based Zero Trust Exchange is the world’s largest in-line cloud security platform.

We believe the future of work is Human + AI and are building an AI-native enterprise where human potential is amplified by machine intelligence to solve the world’s hardest security challenges. Driven by deep customer obsession, we are committed to the mission, outcome, and to each other. We bring these commitments to life through three core behaviors: ownership and collaboration, trust through outcomes and impact, and a challenge culture with ongoing feedback. Ready to make an impact at the company pioneering security transformation in the AI era? Join us at Zscaler.

Role

We are looking for a Principal Threat Researcher to join our team. This is a remote role, reporting to the Manager Threat Research in the Threat Research Team. As our Principal Threat Researcher, you will serve as the definitive subject matter expert on adversary behavior across Endpoint and Cloud environments. You will dissect, replicate, and outmaneuver sophisticated cyber attack techniques to understand exactly how they operate and how to defeat them. By translating complex threat research into concrete, scalable detection recommendations, you will act as the innovation driver for our defensive capabilities. In this pivotal role, your insights won't just live in a whitepaper—they will directly prioritize our engineering efforts, shape product strategy, influence vendor telemetry, and ensure robust, industry-leading protection for our entire customer base.

What you’ll do (Role Expectations)

Scope and continuously refine research initiatives, applying an adversarial mindset to analyze emerging attack techniques, customer impact, and detection data sources across at least one operating system (Windows, macOS, Linux) and major Cloud/SaaS providers like AWS, Microsoft 365, and Okta

Dive deep into the technical components and detection optics underlying specific threats to fully comprehend how adversaries control and manipulate variations of a given technique

Leverage your endpoint and cloud expertise to engineer automated attack code, write test code to validate threat coverage, and develop proofs of concept for new detections.

Collaborate across Zscaler to develop new detection methodologies and engineering recommendations, working closely with detection engineers, intelligence analysts, and threat hunters to prioritize and refine deliverables

Document and present your research findings and operational deliverables in an accessible, actionable manner to internal and external audiences, while serving as a technical mentor for more junior team members and colleagues pursuing research

Who You Are (Success Profile)

You thrive in ambiguity, comfortably building the path forward in dynamic environments and leveraging uncertainty as raw material to create meaningful security solutions.

You act like an owner, bringing passion for the mission and seamlessly navigating between high-level threat strategy and hands-on technical execution.

You are an energized problem-solver who actively seeks out complex security challenges, knowing that tackling tough technical problems yields the greatest impact.

You are a high-trust collaborator who thrives in a challenge culture, using transparent feedback and clarity to elevate team performance and build mutual trust.

You are a continuous learner with a growth mindset who actively seeks feedback, develops new expertise, and approaches work with genuine purpose.

What We’re Looking for (Minimum Qualifications)

Foundational understanding of AI/ML technologies and experience leveraging, securing, or positioning AI-driven solutions to optimize outcomes within your functional domain

12+ years of experience conducting security research with actionable outcomes

Extensive security expertise in at least one operating system alongside experience working with commercial Endpoint Detection & Response (EDR) platforms

Security experience in at least one cloud service provider (e.g., AWS, GCP, Azure), Cloud architectures, and Cloud-based detection platforms

Software development experience in at least one scripting language (e.g., PowerShell, Python) and one compiled/assembled language (e.g., C, C++, Rust, Go)

Experience managing code with version control systems like git/GitHub

What Will Make You Stand Out (Preferred Qualifications)