Lead Software Engineer 75,000 to 85,000 + Private Healthcare + Enhanced PensionSouthampton (Hybrid, 4 days per week in the office)Are you a senior software engineer looking to take end to end ownership of a complex, real-time distributed platform that integrates directly with mission-critical hardware used in security and critical infrastructure environments?This is a principal-level technical role within a specialist engineering business developing a real-world platform that ingests, processes and surfaces live telemetry from radiation detection systems deployed in highly sensitive locations. The software underpins real-time monitoring, alerting and operational decision-making, where performance, reliability and security are non-negotiable.You will lead the technical direction of a TypeScript-based microservices platform, remaining hands-on across backend services while also owning a large Angular enterprise application used by customers in the field. Working closely with a capable onshore team and an established offshore function, you will shape architecture, standards and delivery across the full software lifecycle.This role suits an experienced engineer who enjoys deep technical ownership, architectural responsibility and building systems that have genuine real-world impact.The Role: Technical ownership of a TypeScript-based, microservices backend platform running in Linux environments Leading development of a large Angular front-end used for real-time dashboards, monitor