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55 Zscaler Performance Engineer Jobs Hiring Near You

Zscaler

Staff macOS/iOS Developer - Networking

San Jose, CA · Hybrid

$60.75 - $83.50/hr

Develop high-performance macOS and iOS applications and frameworks that serve as the gateway to our ... Uphold and evolve engineering excellence by maintaining rigorous code quality, standards, and ...

Zscaler

Staff Site Reliability Engineer

San Jose, CA · Hybrid

$66.75 - $88.75/hr

Role We are looking for a Staff Site Reliability Engineer to join our Cloud Infrastructure ... Analyze and troubleshoot systems performance and complex issues across operating systems and ...

Zscaler

Sr. Staff Software Engineer - UI, React.js

San Jose, CA · Hybrid

$121.90K - $162.90K/yr

Develop and maintain high-performance resilient UI using ReactJS, TypeScript, and Tailwind ... Demonstrated track record of fostering engineering excellence and driving innovation What Will Make ...

Zscaler

Staff Site Reliability Engineer

San Jose, CA · Hybrid

$66.75 - $88.75/hr

... performance and network analysis, and creating reusable tools * Develop automation solutions and ... systems engineering * Proficiency with Python or Ansible for automation tasks as well as ...

Zscaler

Principal Rust Developer

Bellevue, WA · Hybrid

Optimize system performance through profiling tools across kernel-space and user-space * Engage in code reviews, system design discussions, technical documentation, and mentoring junior engineers Who ...

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What are the key skills and qualifications needed to thrive as a Performance Engineer, and why are they important?

To thrive as a Performance Engineer, you need strong analytical abilities, a solid understanding of software architecture, and experience with load testing and profiling, often supported by a degree in computer science or a related field. Familiarity with tools such as JMeter, LoadRunner, New Relic, and monitoring systems, as well as scripting languages, is typically required. Excellent problem-solving, attention to detail, and effective communication skills help distinguish top performers in this role. These skills and qualities are crucial for identifying system bottlenecks, optimizing performance, and ensuring a seamless user experience.

What are some common challenges Performance Engineers face when optimizing complex systems?

Performance Engineers often encounter challenges such as identifying bottlenecks in multi-tiered or distributed systems, balancing trade-offs between speed and resource consumption, and ensuring that performance improvements do not compromise system reliability. They frequently work with cross-functional teams, requiring strong communication skills to translate technical findings into actionable recommendations. Staying up-to-date with evolving tools and best practices is also essential, as technology stacks and performance benchmarks continually change.

What is a Performance Engineer?

A Performance Engineer is a professional who ensures that software applications and systems run efficiently and meet performance requirements. They analyze, test, and optimize system performance by identifying bottlenecks, conducting load and stress testing, and recommending improvements. Performance Engineers work closely with development and operations teams to ensure that applications can handle expected user loads and deliver a smooth user experience. Their work is crucial in preventing slowdowns, crashes, and other performance-related issues in production environments.

What is the difference between Performance Engineer vs Software Test Engineer?

AspectPerformance EngineerSoftware Test Engineer
Primary FocusOptimizing system performance, load testing, scalabilityFunctional testing, bug identification, feature validation
Required SkillsPerformance testing tools, scripting, system analysisTest case design, automation, defect tracking
Work EnvironmentDevelopment teams, QA, DevOpsQA teams, development teams
CertificationsPerformance testing certifications (e.g., JMeter, LoadRunner)ISTQB, software testing certifications

Performance Engineers focus on system performance, scalability, and load testing, ensuring applications run efficiently under stress. Software Test Engineers primarily verify functionality and identify bugs. While both roles require testing skills, Performance Engineers specialize in performance metrics and optimization, making their roles complementary but distinct.

What is it like to work at Zscaler?

Zscaler is a company that prioritizes innovation, collaboration, and customer satisfaction, fostering a dynamic and fast-paced work environment. The company's structure is organized into agile teams that work closely together to develop and deliver cloud-based security solutions, with a focus on innovation and customer success. Working at Zscaler may appeal to candidates who are passionate about cybersecurity, enjoy working in a collaborative and dynamic environment, and are motivated by the opportunity to make a significant impact in the rapidly evolving field of cloud security.
What other companies are hiring for Performance Engineer jobs?
What are the most popular jobs at Zscaler?
What are the most popular categories at Zscaler?
Infographic showing various Performance Engineer job openings at Zscaler in the United States as of May 2026, with employment types broken down into 7% Internship, and 93% Full Time. Highlights an 61% Physical, and 39% Remote job distribution.
Staff Software Engineer - React.js

Staff Software Engineer - React.js

Zscaler

San Jose, CA • Hybrid

Other

Posted 10 days ago

Job description

Role

We are looking for a seasoned Staff Software Development Engineer (UI/React.js) to join our team in San Jose, CA, reporting to the Director, Engineering in the Unified Experiences Platform department. As a key member of this team, you will be responsible for crafting high-quality libraries and tools while building high-performance, resilient UI that scales. You will serve as a technical leader, driving engineering excellence and ensuring our frontend architecture meets the highest standards of performance and maintainability.

What you'll do (Role Expectations)

  • Craft high-quality libraries and tools for building frontend applications

  • Develop and maintain high-performance resilient UI using ReactJS, TypeScript, and Tailwind

  • Document and communicate technical specifications to ensure alignment with stakeholders

  • Identify and resolve technical challenges by incorporating a robust test automation strategy

  • Participate in code reviews and enforce coding standards to ensure a maintainable codebase

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)

  • 5+ years of experience in JavaScript development with a focus on building and deploying ReactJS applications

  • Expertise in creating lean, clear documentation, testing, and automation as integral components of the UI workflow

  • Exceptional problem-solving skills and a proven ability to develop creative solutions to technical challenges

  • Experience effectively conveying complex technical concepts to both technical and non-technical stakeholders

  • Demonstrated track record of fostering engineering excellence and driving innovation

What Will Make You Stand Out (Preferred Qualifications)

  • Demonstrated expertise in performance optimization and high-quality, detail-oriented code quality

  • Proficiency in resolving performance bottlenecks to ensure fluid rendering in data-intensive interfaces

  • Skilled in designing scalable, reusable front-end architectures that prioritize efficient component composition

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