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About the company
Zscaler (NASDAQ: ZS) accelerates digital transformation so that customers can be more agile, efficient, resilient, and secure. The Zscaler Zero Trust Exchange is the companyās cloud-native platform that protects thousands of customers from cyberattacks and data loss by securely connecting users, devices, and applications in any location. With more than 10 years of experience developing, operating, and scaling the cloud, Zscaler serves thousands of enterprise customers around the world, including 450 of the Forbes Global 2000 organizations. In addition to protecting customers from damaging threats, such as ransomware and data exfiltration, it helps them slash costs, reduce complexity, and improve the user experience by eliminating stacks of latency-creating gateway appliances. Zscaler was founded in 2007 with a mission to make the cloud a safe place to do business and a more enjoyable experience for enterprise users. Zscalerās purpose-built security platform puts a companyās defenses and controls where the connections occurāthe internetāso that every connection is fast and secure, no matter how or where users connect or where their applications and workloads reside.
Job Summary
We are looking for a Principal Software Development Engineer to our Zero Trust Exchange team. Reporting to the Sr Manager of Software Engineering, you'll be responsible for:
šConducting comprehensive performance investigations across production and pre-production environments, network stack, microservices, and client-side browser performance šAdvocating for and implement "shift-left" performance strategies, focusing on systemic fixes and architectural improvements to prevent performance regressions and minimise reactive "firefighting" šAnalysing and optimising front-end application performance using advanced browser tools, focusing on critical metrics such as Time to First Byte (TTFB), Largest Contentful Paint (LCP), and Total Blocking Time (TBT) šDeveloping and maintaining specialised performance tooling, tracing scripts (e.g., EBPF), and advanced visualisations like Flame Graphs to identify and communicate complex bottlenecks šCollaborating closely with development and infrastructure teams, providing expert guidance on performance design, code optimisation, and efficient utilisation of operating system and network resources
What We're Looking for (Minimum Qualifications)
š8+ years of experience specialising in systems performance engineering, with a foundational understanding of operating system internals (Linux) and core resource management (CPU, Memory, Disk, Network) šHands-on experience with advanced Linux performance tools, including perf, DTrace, or eBPF/BPF Performance Tools, capable of conducting in-depth kernel-level analysis šIn-depth knowledge of k8s performance considerations, including cluster capacity planning, CNI overhead, resource limits (requests and limits), and efficient pod scheduling šExpertise in utilising advanced profiling features in Chrome Developer Tools (Lighthouse, Performance tab) to diagnose rendering jank, JavaScript execution time, and core web vitals
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