Sr. Cyber Security Engineer

Job Title

Sr. Cyber Security Engineer

You will serve as a Sr. Cyber Security Engineer responsible for designing, building, and evolving our internal enterprise browser platform with a focus on secure, centrally governed access to generative AI tools. You will work closely with security architecture, identity, networking, and AI governance teams to embed policy enforcement, visibility, and controls directly into the browser runtime, enabling secure-by-design application delivery across the enterprise.

• Design, develop, and maintain enterprise browser features and system components that support secure access to internal and external applications.
• Build integrations between the enterprise browser and security ecosystems, including endpoint security and device management, network security technologies, and identity and access management solutions.
• Implement browser-level security mechanisms, including session isolation, in-browser access enforcement, authentication and authorization workflows, and data protection and policy controls.
• Develop services that collect, interpret, and act on device posture, endpoint telemetry, and user identity and contextual access information.
• Design and implement a browser-level AI Controls Framework that governs enterprise use of generative AI tools (for example, Gemini, Claude, Grok, OpenAI), including centralized policy enforcement, isolation of sensitive data, guardrails for data submission and exfiltration, and instrumentation for AI interactions.
• Create browser-mediated abstractions and capabilities such as AI usage classification and risk scoring, approved model routing, dynamic masking and redaction, and identity‑bound usage controls to reduce the need for direct integration with each AI provider.
• Troubleshoot and debug complex issues across browser runtime, network stack, operating system integrations, and identity layers while contributing to performance tuning, reliability engineering, and platform scalability.
• Responsibilities listed are not intended to be all‑inclusive and may be modified as necessary.

• 6+ years of experience in software engineering in systems, platforms, or security‑focused development environments.
• 6+ years of experience with one or more system‑level languages such as C++, Rust, Go, Java, or similar object‑oriented or systems programming languages.
• 5+ years of experience working with network protocols (HTTP/S, TLS, proxy architectures) and authentication and authorization flows (OAuth, SAML, OpenID Connect) in enterprise environments.
• 4+ years of experience integrating with enterprise security and access control systems such as endpoint security, device management, secure web gateways, private application access, or security infrastructure APIs.
• Experience with browser concepts such as rendering engines and runtime components, extensions or embedded browser frameworks, and network traffic interception and inspection models.
• Strong analytical and debugging skills across distributed systems, including complex interactions between browser, network, identity, and operating system layers.
• Bachelor’s degree or degree in Computer Science, Engineering or related field or equivalent combination of education, related experience and/or military experience.

• Experience with Chromium‑based architectures or commercial enterprise browsers such as Island.
• Background in endpoint security, application security, network security, and/or Zero Trust architectures.
• System integration experience with both Windows and macOS platforms.
• Knowledge of secure coding practices, threat modeling, software hardening, and security compliance or regulated‑industry requirements.
• Exposure to AI or machine learning governance, data protection controls, or secure enterprise adoption of large language model (LLM) technologies.

• This role is on‑site Monday through Friday. Fiserv considers in‑person collaboration to be an essential part of this role as in‑person office experience helps you with your overall onboarding experience and leads to stronger productivity.

This role requires…