Staff Threat Researcher

Zscaler, Inc.; Pune District; Hybrid; INR 900,000 - 1,500,000; Full time

Job summary

Zscaler, Inc. is seeking a Staff Threat Researcher for a Hybrid role in Pune to analyze threats, hunt adversaries, and improve detection across our global ecosystem.

You will conduct proactive and retroactive investigations, document findings, and support customers with flexible on‑call schedules in a fast‑paced security environment. Ideal candidates bring AI/ML awareness, extensive threat hunting experience, SIEM proficiency, and strong scripting in Python, plus knowledge of MITRE ATT&CK and

Qualifications

• Foundational understanding of AI/ML technologies and experience leveraging AI‑driven solutions.
• Hands‑on threat hunting, incident response, security operations, malware analysis, or network defense.
• Practical experience using SIEM tools like Splunk, Microsoft Sentinel, or ElasticSearch.
• Deep familiarity with the MITRE ATT&CK framework and modern TTPs.
• Advanced scripting with Python and expertise in IDS/IPS and YARA signatures for threat detection.

Responsibilities

• Analyze emerging threats, adversarial behaviors, and TTPs to improve detection capabilities.
• Conduct proactive and retroactive threat hunting using telemetry and behavioral methods.
• Research, analyze, validate, and document threat hunting findings clearly.
• Hunt and respond to customers with flexible schedules and on‑call support.
• Translate adversary behavior into actionable hunt hypotheses and detection logic.

Skills

AI/ML fundamentals

Threat hunting

Incident response

Security operations

Malware analysis

Network defense

Python scripting

IDS/IPS signatures

YARA signatures

MITRE ATT&CK

Education

Bachelor’s or graduate degree in CS/Engineering

Tools

Splunk

Microsoft Sentinel

ElasticSearch

Job description

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 160+ public exchanges globally and thousands of private exchanges 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 Staff Threat Researcher to join our team. This is a Hybrid role, reporting to the Senior Manager in the Threat Hunting department. You will analyze emerging threats, adversarial behaviors, and tactics, techniques, and procedures (TTPs) to understand attacker methodologies and improve detection capabilities across our global ecosystem. This role requires conducting proactive and retroactive threat hunting using Zscaler telemetry while working flexible schedules, including weekend night shifts, to meet global operational demands.

What you’ll do (Role Expectations)

Analyze emerging threats, adversarial behaviors, and TTPs to understand attacker methodologies and improve detection capabilities

Conduct proactive and retroactive threat hunting using Zscaler telemetry and behavioral-based methodologies

Research, analyze, validate, and clearly document all threat hunting findings

Independently hunt and respond to customers while managing flexible operational schedules and on‑call support

Identify and translate adversary behavior into actionable hunt hypotheses and detection logic

Who You Are (Success Profile)

You thrive in ambiguity. You're comfortable building the path as you walk it. You thrive in a dynamic environment, seeing ambiguity not as a hindrance, but as the raw material to build something meaningful.

You act like an owner. Your passion for the mission fuels your bias for action. You operate with integrity because you genuinely care about the outcome. True ownership involves leveraging dynamic range: the ability to navigate seamlessly between high-level strategy and hands‑on execution.

You are a problem‑solver. You love running towards the challenges because you are laser‑focused on finding the solution, 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. You embrace our challenge culture by giving and receiving ongoing feedback—knowing that candor delivered with clarity and respect is the truest form of teamwork and the fastest way to earn trust.

You are a learner. You have a true growth mindset and are obsessed with your own development, actively seeking feedback to become a better partner and a stronger teammate. You love what you do and you do it with 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

Hands‑on experience in threat hunting, incident response, security operations, malware analysis, or network defense

Practical experience using SIEM tools such as Splunk, Microsoft Sentinel, or ElasticSearch

Deep familiarity with the MITRE ATT&CK framework and modern Tactics, Techniques, and Procedures (TTPs)

• Advanced scripting and automation skills, specifically using Python, paired with expertise in writing IDS/IPS and YARA signatures for network‑based threat detection

What Will Make You Stand Out (Preferred Qualifications)

Experience leveraging AI/ML models, large language models (LLMs), or natural language processing (NLP) to automate threat intelligence synthesis, accelerate hunt hypothesis generation, or streamline the analysis of large‑scale telemetry datasets

Significant experience as a Senior Threat Hunter leading complex investigations and mentoring junior team members

• Proven ability to analyze adversary behavior and malware campaigns to translate findings into detection logic, supported by a Bachelor’s or graduate degree in Computer Science, Engineering, or equivalent security experience

#LI-Hybrid #LI-GL2

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:

• Time off plans for vacation and sick time
• Parental leave options
• Retirement options
• In‑office perks, and more!

Learn more about Zscaler's 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 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.

Voluntary Self Identification

At Zscaler, we value diversity, equity, inclusion and belonging. We invite you to voluntarily respond to the question(s) below to help us measure the effectiveness of our outreach and recruitment. Responding is entirely voluntary and will not impact your application process. All responses will be kept confidential and handled in accordance with applicable privacy laws. Thank you for helping us create a more inclusive workplace.