Senior Software Engineer

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About the 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. Summary Menlo Security is hiring a Senior Software Engineer to join our Threat Protection and ShadowAI team in the UK. This team ensures that users can safely browse the web through Menlo's secure cloud — protecting them from malicious sites (including those built or operated with AI) and securing access to authorised web applications. The services this team builds are core to Menlo's secure enterprise browser for both humans and AI agents, which puts you at the centre of one of the most active problems in enterprise security right now: how organisations gain visibility into and control over unsanctioned AI usage without blocking it entirely. The team applies AI in how it builds as well — code assistants, AI-assisted test generation, and LLM-supported log and incident analysis — so you will be using these tools alongside defending against their misuse. Outcomes & KPIs Key Outcome(s) Owned: • Reliable, performant delivery of Threat Protection and ShadowAI services that detect and control risky web and generative AI application usage for Menlo customers. • End-to-end ownership of assigned features, from design through production operation and iteration. Success Metrics / KPIs: (drafted for hiring manager review and adjustment) • Service availability and latency for owned components meet or exceed team SLOs. • Features delivered on committed roadmap dates, with quality measured by post-release defect and rollback rates. • Automated test coverage maintained or improved on owned code paths. • Detection accuracy for AI application and malicious site coverage, measured by false positive and false negative rates. • Mean time to detect and resolve production issues in owned services. What You'll Do • Design, develop, and own new features and services in the Threat Protection and ShadowAI product area, contributing directly to Menlo's technical roadmap. • Build highly available, scalable distributed systems and APIs, including multithreaded and asynchronous applications, with performance and security considered from the start. • Build and refine the detection and policy capabilities that give customers visibility into generative AI and unsanctioned web application usage in their environments. • Participate in building, deploying, and operating the Menlo Security platform in production, using dashboards, error reporting, metrics, and AI-assisted log and trace analysis to identify and resolve defects quickly. • Use AI code assistants and AI-assisted test generation as part of your normal workflow to move faster, while applying your own judgement on correctness, security, and maintainability before anything ships. • Partner with product, security, operations, and other cross-functional stakeholders to align on requirements, tradeoffs, and schedules. • Write unit and automated tests, conduct code and design reviews for peers, and evaluate emerging technologies that could improve our products. Functional Competencies Required: • 3-5 years of professional software development experience with one or more of NodeJS, Go, or Python. • 3-5 years of hands-on experienc

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