Principal Infrastructure Engineer- Cheltenham-Permanent (flexible work patterns available) - Up to £80,000 About the Opportunity This is an exciting opportunity for an experienced Principal Systems Administrator to play a key role in the design, delivery, and support of critical enterprise infrastructure within a highly secure and technically complex environment. Working as part of a skilled infrastructure team, you will provide technical leadership, contribute to strategic projects, and ensure the reliability, security, and performance of core business systems. This role offers the chance to work with a broad range of technologies while influencing technical direction and supporting business-critical services. Key Responsibilities * Provide technical leadership and subject matter expertise across infrastructure and systems administration functions. * Design, implement, administer, and support enterprise systems and platforms. * Lead and contribute to complex infrastructure projects and service improvements. * Troubleshoot and resolve advanced technical issues across multiple technology domains. * Support the delivery of highly available services, including participation in an on-call rota and out-of-hours change activities. * Collaborate with internal teams and third-party vendors to maintain and enhance critical applications and infrastructure. * Contribute to service planning, operational excel...