Lead Software Engineer Winchester (Hybrid, 4 days per week in the office) £75,000 - £85,000 + Private Healthcare + Enhanced Pension Are you an experienced software engineer looking to take principal-level ownership of a complex, real-world distributed system used across security and critical infrastructure environments?This is a senior technical role within a specialist engineering business building software that directly integrates with radiation detection hardware deployed in highly sensitive settings. The platform powers real-time monitoring, telemetry, alerting and operational decision-making, supporting customers where reliability, security and accuracy are critical.You will take ownership of a distributed, microservices-based platform, shaping its architecture and technical direction while remaining hands-on with development. Working closely with a small but highly capable onshore team and an established offshore engineering function, you will have genuine influence over how the system evolves and how features are delivered.This is a fantastic opportunity for an engineer who enjoys deep technical challenges, architectural responsibility and working on systems that have tangible, real-world impact.The Role: Ownership of a Linux-based, microservices-driven software platform Hands-on development across core services and system components Defining and evolving secure, scalable system architecture Working closely with and guiding offshore engineering teams Contributing to st