Sr. Software Development Engineer

Zscaler; Bengaluru; Hybrid; INR 1,500,000 - 2,800,000; Full time

Benefits offered by this job

Various health plans

Time off plans for vacation and sick

Parental leave options

Retirement options

Education reimbursement

In-office perks

Job summary

Zscaler is seeking a Sr. Software Developer to design, build, and maintain web applications in ThreatLabz. You will own feature modules end‑to‑end, ensuring robust communication between the UI and backend services.

This role blends server‑side work with frontend responsibilities in a hybrid setup. Candidate should have 2–3 years of Python experience, proficiency with Django/Flask, and strong PostgreSQL/MongoDB knowledge, plus ELK skills.

Qualifications

• Curiosity and exploration of AI tools; history of integrating frontier LLMs into workflows.
• 2–3 years of professional application development with Python and backend frameworks Django/Flask.
• Strong understanding of PostgreSQL and MongoDB; hands-on ORM experience.
• Frontend basics with HTML5, CSS3, JavaScript, jQuery, and AngularJS.
• ELK Stack knowledge: cluster setup, Logstash, Kibana, Elasticsearch concepts.

Responsibilities

• Design, build, and maintain client-side and server-side web apps.
• Secure RESTful APIs and microservices; ensure data protection.
• Map and optimize relational and NoSQL databases.
• Develop responsive UI with HTML5/CSS3/JS/TS and modern frameworks.
• Collaborate with ThreatLabz to review code and run unit tests.

Skills

Python

Django

Flask

HTML5

CSS3

JavaScript

TypeScript

Node.js

REST APIs

Security mindset

Tools

PostgreSQL

MongoDB

ELK Stack

GitHub/GitLab

AWS/Azure/GCP

Django REST framework

NPM/Yarn

Job description

About Zscaler

Zscaler accelerates digital transformation to ensure our customers can be more agile, efficient, resilient, and secure. As an AI‑forward enterprise, we are constantly pushing the envelope, leveraging the world’s largest security data lake to power our cloud‑native Zero Trust Exchange platform. This innovation protects our customers from cyberattacks and data loss by securely connecting users, devices, and applications in any location. Here, an impact in your role matters more than title and trust is built on results. We say, impact over activity. We seek innovators who actively use AI to amplify their impact and who thrive in an environment where we leverage intelligent systems to stay ahead of evolving threats. We believe in transparency and value an 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 be part of the team that’s helping to secure the AI age, we invite you to bring your talents to Zscaler and help shape the future of cybersecurity.

Role

We are looking for a Sr. Software Developer to join our team. This is a hybrid role, reporting to the Leader in the Tools & Technology Team in the ThreatLabz department. The Sr. Software Developer will be primarily responsible for designing, building, and maintaining client‑side and server‑side web applications, taking ownership of end‑to‑end feature modules and ensuring seamless communication between user‑facing interfaces and backend infrastructure. Working within ThreatLabz, the world‑class security research arm of Zscaler, this role contributes directly to hunting new threats and protecting millions of global users.

What You’ll Do (Role Expectations)

• Build and scale server‑side web applications, secure RESTful APIs, and microservices using Node.js, Python, Django, or Flask
• Manage core application security settings, user authentication, authorization protocols, and data protection measures
• Map and optimize database schemas using relational systems like PostgreSQL or MySQL and NoSQL engines like MongoDB
• Build responsive, high‑performance user interfaces and reusable frontend modules utilizing HTML5, CSS3, JavaScript/TypeScript, and modern frameworks
• Collaborate closely with the ThreatLabz Cyber Threat Research organization to conduct code reviews, perform unit testing, and maintain software applications

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 toward 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)

• Demonstrated curiosity and active exploration of AI tools, with a proven history of integrating new technologies like frontier LLMs and vibe coding into workflows to augment problem‑solving
• A minimum of 2‑3 years of professional application development experience with proficiency in Python and backend frameworks including Django and Flask
• Strong understanding of database systems like PostgreSQL and MongoDB, alongside hands‑on experience with Object Relational Mapper libraries
• Expertise in frontend development with HTML5, CSS3, JavaScript, jQuery, and AngularJS
• In‑depth knowledge of the ELK Stack, including cluster setup, Logstash configuration, Kibana visualizations, Elastic beats, and core Elasticsearch concepts

What Will Make You Stand Out (Preferred Qualifications)

• Competency in Python‑based data science tools such as pandas and NumPy, and experience implementing machine learning algorithms to optimize security solutions
• Experience in Agile methodologies and version control tools such as GitHub, GitLab, or SVN
• Familiarity with cloud services offered by major providers like AWS, Azure, or GCP

Benefits

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

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.

Learn more about Zscaler's hybrid working model and benefits here.

Pay Transparency: Zscaler complies with all applicable federal, state, and local pay transparency rules.

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.

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.