Senior Software Engineer (Chromium)

Menlo Security Inc.; Bracknell; On-site; GBP 85,000 - 120,000; Full time

Job summary

Menlo Security is seeking a Senior Software Engineer to join our Chromium team supporting MARS, our internal AI initiative. You will contribute deep C++ expertise across Chromium layers to build secure browser features enabling AI-driven capabilities.

You will collaborate with security and AI engineers, apply networking fundamentals, and help deploy cloud infrastructure using AWS, GCP, Kubernetes, and Terraform. This role blends systems engineering with AI-focused development.

Qualifications

• Strong C++ engineering skills and hands-on Chromium experience desirable.
• Deep knowledge of networking and HTTP security in browser context.
• Bachelor's degree or higher in Computer Science or related field.
• Experience with Chromium layers (content, browser, core, compositor, skia, networking) preferred.
• Familiarity with Python or Rust for tooling is a plus.

Responsibilities

• Design, build, and maintain Chromium-based browser components in C++ across layers.
• Apply networking and HTTP security expertise to harden browser isolation and infrastructure.
• Collaborate with the MARS team to integrate AI agent capabilities and MCP servers.
• Develop supporting tooling and prototypes in Python or Rust.
• Deploy and operate cloud infrastructure (AWS, GCP) and Kubernetes/Terraform for workloads.
• Debug and optimize high-scale, performance-critical systems across browser and supporting infra.
• Work with cross-functional teams to ship capabilities end-to-end.
• Leverage AI-assisted coding tools to accelerate development and reviews.

Skills

Strong C++ engineering skills

Strong networking fundamentals

Bachelor's degree in Computer Science

Chromium layers experience

Python or Rust experience

Education

Bachelor's degree in Computer Science or related field

Job description

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.

Summary

Menlo Security is looking for a Senior Software Engineer to join our Chromium engineering team in support of MARS, Menlo's internal AI initiative. You'll bring strong C++ skills - ideally with hands-on Chromium experience across layers such as content, browser, core, compositor, skia, and networking - to build and harden the browser capabilities that make Menlo's AI-driven features possible. The role blends deep systems and networking engineering with hands-on work on AI agents and MCP (Model Context Protocol) servers, alongside the cloud infrastructure (AWS, GCP, Kubernetes, Terraform, Linux) that supports them. You'll work alongside engineers across Chromium, AI, and security disciplines to ship reliable, high-performance capabilities, using AI-assisted development tools yourself to move faster without cutting corners on quality.

Outcomes & KPIs

Key Outcome(s) Owned

• Ship reliable, high-performance Chromium-based capabilities that power Menlo's internal AI/agent initiatives (MARS), while maintaining the security and performance bar expected of Menlo's browser platform.

Success Metrics / KPIs

• Feature delivery velocity against MARS roadmap milestones.
• Performance and stability of shipped Chromium-based components (e.g., crash rate, latency).
• Reduction in manual toil via agent/MCP-based tooling adopted internally.
• Code review turnaround time and quality for C++ contributions.
• Successful integration of AI agents or MCP servers into internal workflows or product surfaces.

What You'll Do

• 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.
• Apply strong networking fundamentals and HTTP security expertise to harden Menlo's browser isolation and network-facing infrastructure.
• Partner with the MARS team to build and integrate AI agent capabilities and MCP (Model Context Protocol) servers into Menlo's platform.
• Use Python or Rust to build supporting tooling, services, and prototypes alongside core C++ work.
• Deploy and operate the cloud infrastructure (AWS, GCP) and orchestration (Kubernetes, Terraform) needed to run agent/MCP workloads reliably.
• Debug and optimize performance-critical, high-scale systems across the browser and supporting 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.

Functional Competencies

Required

• Strong C++ engineering skills
• Strong networking fundamentals, including solid knowledge of HTTP security.
• Bachelor's degree or higher in Computer Science or a related field.

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).
• Python or Rust experience.
• Experience building or integrating AI agents and MCP (Model Context Protocol) servers.
• Experience with AWS, GCP, Terraform, Kubernetes, and Linux.
• Experience with Tornado, HAProxy, and AWS EC2.

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.