Principal Software Development Engineer Rust, LLM, Networking

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 worlds 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 debatewere 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 youre enabled to do your best work and embrace your potential. If youre driven by purpose thrive on solving complex challenges and want to be part of the team thats 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 hiring a Principal Software Development Engineer to be a founding member of our AI Security Team offering the chance to build a high-reliability low-latency AI security solution designed to scale for hundreds of millions of this role reporting to the Director Software Development Engineering you will be responsible for designing and implementing core infrastructure components and distributed systems while collaborating closely with various stakeholders throughout the development lifecycle. This is a hybrid role reporting in to the San Jose CA office 3 days a week.

What youll do (Role Expectations)

• Architect develop and optimize a low-latency high-throughput AI Security plane utilizing Rust specifically leveraging its async/await model for highly efficient I/O and service-oriented architecture.
• Build resilient distributed and scalable systems emphasizing concurrency fault tolerance and robust messaging protocols.
• Implement and maintain gRPC services and APIs to ensure seamless integration of the AI Security plane with control and orchestration infrastructure.
• Systematically enhance performance across the entire stack including LLM models by employing profiling tools for both kernel-space and user-space components.
• Contribute actively to the team through technical documentation system design reviews code reviews and by mentoring junior engineering complex multi-functional projects and initiatives defining the technical roadmap and driving execution across teams.

Who You Are (Success Profile)

• Drive the mission with an owners mindset seamlessly bridging high-level strategy and detailed hands-on execution.
• Actively seek challenges and find complex solutions that deliver maximum impact.
• Deeply empathize with internal and external stakeholders anchoring every decision in addressing their real-world problems.
• Maintain strong technical curiosity continually seeking more secure scalable and effective methods to accelerate transformation.
• Connect your work to the companys broader mission designing solutions to support high-growth global organizational needs.

What Were Looking for (Minimum Qualifications)

• 12 years of software engineering experience
• Deep experience in systems programming using Rust with a focus on asynchronous frameworks such as Tokio or async-std.
• Proven ability to design and implement horizontally scalable highly available and observable distributed systems.
• Strong command of Linux internals including kernel-user space interaction networking sockets and namespaces.
• Skilled in performance instrumentation containerized environments Git workflows and CI/CD pipelines.

What Will Make You Stand Out (Preferred Qualifications)

• Expert in systems languages such as C/C or Rust with a focus on performance optimization.
• Deep understanding of Linux networking stacks Kubernetes networking service meshes and LLM model optimization.
• Practical experience with gRPC Protobufs and L4-L7 networking protocols including TCP/IP TLS QUIC HTTP and WebSockets (WSS).
• Direct experience in validating AI-driven products including understanding of model performance metrics and MLOps principles.

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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:

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.