Principal Software Development Engineer (React/Javascript/Typescript)

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,

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

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 visionary Principal Software Development Engineer to join our Frontend Engineering team and lead the design, development, and evolution of world-class web applications. Reporting to the Manager of Software Development Engineering, you will play a pivotal role in shaping Zscaler’s next-generation user interfaces. This is a high-impact leadership role where you will balance hands-on architecture with strategic technical direction, mentoring and guiding other engineers to elevate our overall engineering excellence.

What You'll Do (Key Responsibilities)

• Architect & Deliver: Design and build high-quality ReactJS solutions, specializing in translating complex UI/UX designs into robust, production-ready applications while providing technical mentorship to foster a culture of innovation
• Drive Engineering Excellence: Shape and evolve Zscaler’s core design system. Champion frontend best practices, including modularity, semantic code, comprehensive automated testing, and deep performance tuning
• Cross-Functional Integration: Define clean API contracts and seamless integration roadmaps in collaboration with backend teams. Partner with DevOps to optimize CI/CD pipelines and continuously evaluate emerging technologies
• Scale & Refactor: Lead systematic refactoring efforts to ensure long-term scalability, reliability, and maintainability. Drive engineering excellence with a strong focus on accessibility (a11y) and research-driven methodologies

Who You Are (Success Profile)

• You Think at Scale: You connect your day-to-day work to the larger company mission and think globally. You build solutions, processes, and architectures that are not just effective today, but are built to last and support a high-growth organization
• You are Driven by Innovation: You possess a deep curiosity for how things work and are energized by solving complex technical hurdles. You believe in the power of technology to accelerate transformation and consistently hunt for more secure, scalable methods
• You are a Problem-Solver: You actively seek out engineering challenges because you are energized by finding solutions, knowing that solving the hardest problems delivers the biggest business and customer impact
• You are Data-Driven: You lean on data and analytics to uncover engineering truths, measure what matters, and guide informed architectural decisions—replacing "I think" with "I know."
• You are a Learner: You have a true growth mindset and never stop developing your technical or leadership skills. You actively seek and implement feedback to become an exceptional collaborator and teammate

What We're Looking For (Minimum Qualifications)

• Experience: 8+ years of professional software development experience, with 5+ years specializing in large-scale, production-grade ReactJS and Redux applications
• Technical Mastery: Expert-level proficiency in ReactJS development using TypeScript, ES6+, and advanced state management paradigms
• Data Visualizations: Proven experience building highly complex UIs, data-heavy dashboards, and advanced data visualizations (e.g., D3.js)
• Testing Excellence: Deep expertise in developing extensive unit, integration, and E2E testing suites using frameworks such as Jest, Enzyme, or Cypress
• Enterprise Architecture: Proven track record of designing and deploying large-scale enterprise UIs emphasizing high availability, performance, and a seamless global user experience
• AI Tool Integration: Demonstrated curiosity and active exploration of AI tools, with a history of integrating modern technologies to enhance daily workflows and augment problem-solving capabilities

What Will Make You Stand Out (Preferred Qualifications)

• Advanced experience driving performance optimization (speed, responsiveness) using cutting-edge techniques such as lazy loading, code splitting, and tree shaking to enhance application scalability
• Strong familiarity with backend development principles and practical experience using Node.js (or similar) for API integration, tooling, and debugging
• Ability to architect and implement scalable, modular solutions tailored for multi-tenant enterprise applications, ensuring future-proofed system development 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.

Benefits 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 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.