Principal Software Engineer_Fullstack

About Us Sophos is a cybersecurity leader defending 600,000 organizations globally with an AI-driven platform and expert-led services. Sophos meets organizations wherever they are in their security maturity and grows with them to defeat cyberattacks. Its solutions combine machine learning, automation, and real-time threat intelligence with frontline human expertise from Sophos X-Ops to deliver advanced, 24/7 threat monitoring, detection, and response. Sophos offers industry-leading managed detection and response (MDR) alongside a comprehensive portfolio of cybersecurity technologies — including endpoint, network, email, and cloud security, extended detection and response (XDR), identity threat detection and response (ITDR), and next-gen SIEM. Together with expert advisory services, these capabilities help organizations proactively reduce risk and respond faster, with the visibility and scalability needed to stay ahead of evolving threats. Sophos goes to market with a global partner ecosystem, including Managed Service Providers (MSPs), Managed Security Service Providers (MSSPs), resellers and distributors, marketplace integrations, and cyber risk partners, giving organizations the flexibility to choose trusted relationships when securing their business. Sophos is headquartered in Oxford, U.K. More information is available at www.sophos.com . Role Summary We are looking for a Principal Software Engineer to provide hands-on technical leadership for the Central Platform Group. You will lead the architecture, design, and delivery of customer-facing capabilities spanning user interfaces, backend services, APIs, and shared cloud platforms. You will also help build secure, reliable AI experiences that connect customers with assistants and agents across Sophos products. This is a senior individual-contributor role with responsibility for production code, cross-team architecture, engineering quality, and technical direction. AI-driven engineering is a core expectation for this role. You will use AI coding agents as part of day-to-day software development and help establish effective agentic workflows that improve delivery speed and quality while preserving security, human review, and engineering accountability. Team Summary The Central Platform Group builds the shared customer-facing capabilities at the heart of Sophos Central and Sophos Fusion. This includes web experiences, backend services, APIs, identity and access capabilities, platform integrations, and AI-powered interactions used across the Sophos portfolio.