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Senior Engineer II, Chromium

EMEA - Distributed (UK)Posted 30 Oct 2026

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About this role

Menlo Security is the leader in Browser Security for human and agentic workforces. Our mission is to enable humans and agents to connect, communicate, and collaborate securely, without compromise. The Menlo Browser Security Platform protects organizations from cyberattacks by stopping threats across the web, documents, and email before they reach the user. With Menlo Agent Runtime Security (MARS), that protection now extends to the AI agents working alongside every employee.

Menlo Security is trusted by major global businesses, including Fortune 500 companies and government agencies, to protect their most valuable asset, their data, and is backed by top-tier investors. We are looking for a Senior Software Engineer to join our Data Security & AI Engineering team. In this role, you will bring strong systems engineering skills—ideally with hands-on Chromium experience across core layers—to build, expand, and harden the runtime capabilities that power Menlo's next-generation AI security platform.

You will work at the intersection of browser engine internals, systems architecture, and AI security, expanding our detection surfaces to safeguard enterprise workforces and AI agents against modern threats like Prompt Injection (PI) and Shadow AI usage. The role blends deep C++ browser engineering with work on Model Context Protocol (MCP) servers, Chrome DevTools Protocol (CDP), and the cloud infrastructure supporting them.

You’ll collaborate closely with engineers across Chromium, AI, and security disciplines to ship high-performance, evasion-resistant protections, leveraging AI-assisted development tools to move fast while maintaining an uncompromising bar for quality and security. Responsibilities - Design, build, and maintain Chromium-based browser components in C++, working across layers such as content, browser, core, compositor, skia, and networking, that power Menlo's security and AI-driven capabilities.

- Architect and embed controls for detecting Prompt Injection (PI) and managing Shadow AI activity directly within browser execution and agent workflows. - Apply strong networking fundamentals and HTTP security expertise to harden Menlo's browser isolation, proxy/gateway intercepts, and network-facing infrastructure. - Partner with the MARS and AI teams to build and integrate AI agent capabilities and MCP (Model Context Protocol) servers into Menlo's security platform.

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- Use Python or Rust to build supporting tooling, detection microservices, and prototypes alongside core C++ systems work. - Deploy and operate the cloud infrastructure (AWS, GCP) and orchestration (Kubernetes, Terraform) needed to run agent/MCP and threat-detection workloads reliably. - Debug and optimize performance-critical, high-scale systems across the browser and supporting backend infrastructure. - Collaborate cross-functionally with product, security, and AI engineering teams to ship capabilities end-to-end.

- Apply AI-assisted coding tools to accelerate development, testing, and code review as part of your daily workflow. Requirements: - 5+ years of experience in software engineering with strong C++ systems programming skills. - Strong networking fundamentals, including solid knowledge of HTTP security, web protocols and / or client-side security architecture. - Bachelor's degree or higher in Computer Science or a related field (or equivalent practical experience).

Preferred / Nice to Have: - Experience across Chromium layers such as content, browser, core, compositor, skia, and networking (or equivalent large-scale, high-performance C++ systems experience). - Experience or strong interest in AI/LLM security / guardrails domains (e.g., Prompt Injection defense, Shadow AI detection, intent classification, context aware DLP/PII detection, and agentic workflows). - Python or Rust experience.

- Experience building or integrating AI agents, Chrome DevTools Protocol (CDP), and MCP (Model Context Protocol) servers. - Experience with AWS, GCP, Terraform, Kubernetes, and Linux. Follow us on LinkedIn https://www.linkedin.com/company/menlo-security/! Why Menlo? At Menlo, we don't settle for the status quo — in our technology or our culture. How we think and act is just as important as what we build. Our culture is defined by five core mindsets: Proactive Leadership, Straight Talk, United Impact, Elevated Talent, and Customer-Compelled.

We take ownership and drive outcomes without waiting to be told. We communicate directly and seek hard truths. We break down silos and win together. We hold a high bar for ourselves and the people around us. And we treat every customer interaction as mission-critical. If you're someone who sees it, owns it, solves it, and does it — you'll thrive here. All qualified applicants will receive consideration for employment without regard to race, sex, color, religion, sexual orientation, gender identity, national origin, protected veteran status, or on the basis of disability.

TO ALL AGENCIES: Please, no phone calls or emails to any employee of Menlo Security outside of the Talent organization. Menlo Security’s policy is to only accept resumes from agencies via Ashby (ATS). Agencies must have a valid services agreement executed and must have been assigned by the Talent team to a specific requisition. Any resume submitted outside of this process will be deemed the sole property of Menlo Security.

In the event a candidate submitted outside of this policy is hired, no fee or payment will be paid.

Source listing: ashby_menlosecurity

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