Senior C++ Systems Engineer — Browser Security & AI

Menlo Security; United Kingdom; Remote; GBP 110,000 - 150,000; Full time

Job summary

Menlo Security in the United Kingdom is seeking a Senior Software Engineer to join our Data Security & AI Engineering team. The role combines browser engine work with AI security, focusing on secure runtime capabilities and threat detection.

You will work across Chromium layers in C++, integrate MCP/CDP, and deploy cloud infra (AWS, GCP, Kubernetes). You will collaborate with security, AI, and product teams to ship high-performance protections.

Qualifications

• 5+ years of experience in software engineering with strong C++ systems programming.
• Strong networking fundamentals, including HTTP security and web protocols.
• Bachelor's degree or higher in Computer Science or related field.

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.
• 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.

Skills

C++

Systems programming

Networking

Security

Python or Rust

Education

Bachelor's degree

Tools

Chromium internals

CDP

MCP

Terraform

Kubernetes

Linux

Job description

Menlo Security in the United Kingdom is seeking a Senior Software Engineer to join our Data Security & AI Engineering team. The role combines browser engine work with AI security, focusing on secure runtime capabilities and threat detection.

You will work across Chromium layers in C++, integrate MCP/CDP, and deploy cloud infra (AWS, GCP, Kubernetes). You will collaborate with security, AI, and product teams to ship high-performance protections.