Sr. Engineer, Falcon Seraphic Enterprise Browser (Hybrid, ISR)

As a global leader in cybersecurity, CrowdStrike protects the people, processes and technologies that drive modern organizations. Since 2011, our mission hasn’t changed — we’re here to stop breaches, and we’ve redefined modern security with the world’s most advanced AI-native platform. We work on large scale distributed systems, processing almost 3 trillion events per day and this traffic is growing daily . Our customers span all industries, and they count on CrowdStrike to keep their businesses running, their communities safe and their lives moving forward. We’re also a mission-driven company. We cultivate a culture that gives every CrowdStriker both the flexibility and autonomy to own their careers. We’re always looking to add talented CrowdStrikers to the team who have limitless passion, a relentless focus on innovation and a fanatical commitment to our customers, our community and each other. Ready to join a mission that matters? The future of cybersecurity starts with you. About the Role: The Falcon Secure Access (FSA) team at CrowdStrike is expanding. As a Senior Software Engineer on our team, you will architect and deliver a next-generation secure access platform that converges Zero Trust Network Access with browser-native security. You'll build the core systems that enable users to seamlessly and securely access internal sites, private applications, and cloud resources directly from the browser — without legacy VPNs or remote desktops — while enforcing real-time protection against zero-day exploits, phishing, data exfiltration, and unauthorized access. This role sits at the intersection of network engineering and browser security: you'll design and implement advanced proxy communication, secure tunneling, and identity-aware routing — all operating at the browser's core to deliver holistic protection including DLP, insider threat detection, SaaS security, and continuous zero-trust verification. What You'll Do: Design and build ZTNA infrastructure — implement zero-trust access policies, secure tunneling, and identity-aware network routing that replaces traditional VPN architectures Develop advanced networking solutions — build and optimize proxy communication layers, WebSocket-based transport, and encrypted client-to-server channels that handle millions of concurrent connections Architect high-scale backend systems — design distributed microservices for policy enforcement, real-time threat detection, and access control at scale using Node.js / TypeScript Implement secure client-server communication — design highly secured agent-to-cloud architectures with certificate pinning, mutual TLS, and encrypted tunneling protocols Build browser-native security components — develop browser extensions and agents (Chrome, Edge, Firefox etc.) that enforce data protection, prevent data leakage, and provide granular visibility and control Own features end-to-end — from design through delivery, including deployment and monitoring Influence architecture and roadmap — play a key role in architectural decisions, building toward an efficient distributed zero-trust architecture Research and develop — drive new initiatives and POCs in zero-trust access domains and browser security Collaborate cross-functionally — work with security researchers, product, and platform teams across multiple locations to solve complex problems What You'll Need: 5+ years of industry experience building high-performance software products, preferably in cybersecurity Strong networking fundamentals — deep understanding of communication protocols (TCP/IP, TLS, WebSockets, HTTP/2), proxy architectures, and tunneling mechanisms Proven backend expertise — experience designing and developing high-scale microservices in Node.js / TypeScript / Python / GO / C++ Hands-on experience with proxy and secure communication — WebSocket implementations, forward/reverse proxies, MITM inspection, and encrypted channel design Familiarity with encryption and secure communication — TLS/mTLS, certificate management, key exchange protocols, and secure session handling Experience with client-agent development — building complex, efficient client-side agents with reliable server communication Cloud platform experience — AWS, GCP, or Azure, with understanding of on-premises and hybrid infrastructure Strong research and debugging capabilities — ability to dive deep into protocol-level issues, browser internals, and network traces BS or MS in Computer Science or related engineering discipline Proactive problem-solver with attention to detail and a team-oriented mindset Bonus Points: Network security background — experience with network-layer security, firewalls, NAC, SD-WAN, or SASE architectures ZTNA / Zero Trust experience — familiarity with zero-trust principles, identity-based access, micro-segmentation, or existing ZTNA products EDR/endpoint security knowledge — experience integrating with endpoint detection and response platforms Browser internals expertise — Chromium internals, browser extension/plugin development, or web platform APIs OS internals and low-level networking — understanding of OS network stacks, socket programming, or kernel-level packet handling Containerization and orchestration — Kubernetes, self-contained deployable agents, on-prem components #LI-SN1 Benefits of Working at CrowdStrike: Market leader in compensation and equity awards Comprehensive physical and mental wellness programs Competitive vacation and holidays for recharge Paid parental and adoption leaves Professional development opportunities for all employees regardless of level or role Employee Networks, geographic neighborhood groups, and volunteer opportunities to build connections Vibrant office culture with world class amenities Great Place to Work Certified™ across the globe CrowdStrike is proud to be an equal opportunity employer. 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