Full Stack Software Engineer

Onwards Together! Illumio is the leader in ransomware and breach containment, redefining how organizations contain cyberattacks and enable operational resilience. Powered by the Illumio AI Security Graph, our breach containment platform identifies and contains threats across hybrid multi-cloud environments – stopping the spread of attacks before they become disasters. Recognized as a Leader in the Forrester Wave™ for Microsegmentation, Illumio enables Zero Trust, strengthening cyber resilience for the infrastructure, systems, and organizations that keep the world running. Location Sunnyvale, California — 5 days a week in-office Onwards Together! Illumio, the pioneer and market leader of Zero Trust segmentation, prevents breaches from becoming cyber disasters. Illumio protects critical applications and valuable digital assets with proven segmentation technology purpose-built for the Zero Trust security model. Illumio ransomware mitigation and segmentation solutions see risk, isolate attacks, and secure data across cloud-native apps, hybrid and multi-clouds, data centers, and endpoints, enabling the world's leading organizations to strengthen their cyber resiliency and reduce risk. Illuminate the future with Illumio and join a team that's passionate about developing cutting-edge security solutions that protect the world's most critical assets. Our Team's Vision Our Engineering team has established a culture based on thought leadership, independence, and responsibility. This powerful dynamic drives us forward as we work to make the digital world a safer place. Those who join us represent the leader in Zero Trust Segmentation and work on a technology stack that ranges from operating systems to distributed applications to UI and visualization. Together, we will continue to build world-class products driven by people with different perspectives, backgrounds, and a commitment to innovation in a time when the world faces its greatest cybersecurity threats in history. As a Full-Stack Engineer, you will contribute to building scalable, performant, and intuitive user-facing applications while partnering across engineering, product, and design to deliver seamless end-to-end experiences. You will own features through the full development lifecycle—from design and implementation to deployment and operational excellence while helping shape the future of Illumio's user experience and platform capabilities. Your Impact Design, develop, and deliver full-stack features across frontend and backend systems, taking ownership from concept through production deployment Build scalable and responsive web applications using modern frontend frameworks and distributed backend services Contribute to architecture decisions, including frontend infrastructure, CI/CD pipelines, build systems, and application design patterns Own end-to-end quality, including unit, functional, and integration testing, ensuring robust and resilient software delivery Partner cross-functionally with Product Management, Design, and backend teams to refine requirements and deliver high-impact features Optimize user workflows and application performance, ensuring accessibility, responsiveness, and usability across platforms Develop and integrate APIs and services to enable seamless communication across distributed systems Monitor application performance, define metrics, and proactively identify and resolve production issues Continuously improve code quality, maintainability, and developer experience through best practices and tooling Your Toolkit 3–5+ years of professional experience in full-stack or UI-focused software engineering Strong frontend experience with React, TypeScript, JavaScript, HTML5, and CSS3 Experience building backend services and APIs using Node.js, TypeScript, or similar technologies Solid understanding of RESTful API design and distributed system communication patterns Experience with modern build systems, CI/CD pipelines, and frontend tooling Familiarity with version control systems (Git) and collaborative development workflows Understanding of performance optimization, browser rendering, and debugging techniques Knowledge of testing frameworks and best practices across frontend and backend layers Exposure to cloud platforms (AWS, Azure, GCP) and containerization technologies (Docker, Kubernetes) is a plus Bachelor's degree in Computer Science or related field (Master's preferred) Bonus Points Experience building microservices or service-oriented architectures Familiarity with accessibility standards (WCAG 2.0+) and inclusive design practices Experience with frontend performance monitoring and metrics (e.g., INP, latency optimization) Exposure to large-scale SaaS platforms or cybersecurity products Experience working closely with design systems and component libraries Our Commitment: Illumio believes that an environment of unique backgrounds, experiences, viewpoints, and individual contributions drives our success and makes us stronger together. We are dedicated to creating and maintaining a diverse culture and emphasizing inclusion and belonging. This position involves access to software/technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant's capacity to serve in compliance with U.S. export controls. Illumio believes that an environment of unique backgrounds, experiences, viewpoints, and individual contributions creates a culture of belonging, drives our future, and makes us stronger together in support of our customers and their success. All official job offers from our company are extended directly by our recruitment team and will be sent through an official E-Signature document for your review and signature. Please be aware that we do not ask for any personal information in the process of extending offers of employment, such as financial details or social security numbers. Upon acceptance of any offer, we will request such information as part of the onboarding process prior to or on your first day of employment, and only after completing a background check through an authorized third-party vendor. If you receive any communication asking for personal details outside of these processes, please contact us immediately to verify the authenticity of the request. Your security is important to us, and we are committed to a safe and transparent hiring experience. For roles in San Francisco and Los Angeles: Pursuant to the San Francisco Fair Chance Ordinance and the Los Angeles Fair Chance Initiative for Hiring, Illumio will consider for employment qualified applicants with arrest and conviction records. Illumio