We are looking for an experienced Senior Technical Architect to join a high-profile, secure digital programme on a part-time basis until July 2026. This is an exciting opportunity for a highly skilled architect to provide technical leadership and assurance on a project of national importance. Key Details * Location: Corsham (travel expenses covered) * Duration: Until 31 July 2026 * Commitment: Part-time (30 working days total, ad hoc basis agreed with hiring manager) * IR35: In scope * Security Clearance: Must hold active DV clearance and be a sole UK national As Senior Technical Architect, you will: * Lead on the design and assurance of secure digital architectures with a focus on Public Key Infrastructure (PKI). * Review and assure supplier solutions against requirements, ensuring quality and traceability. * Support the production of technical documentation and risk management activities. * Provide technical guidance and knowledge transfer to suppliers and stakeholders. * Oversee testing and validation of solutions, ensuring alignment with strategic objectives. * Mentor and support other architects and technical team members. Essential skills & experience: * Proven expertise in Enterprise PKI (Public Key Infrastructure). * Strong background in solution, business, data, and application architecture. * Experience with architectural modelling to support enterprise-level design. * Knowledge of cloud and distributed architectures. * Excellent technical leadership and communication skills. * Ability to engage across a wide range of technologies, both proprietary and open source. * Experience in secure environments, ensuring compliance with government and industry standards. Desirable: * Experience with requirement traceability in complex programmes. * Prior exposure to highly sensitive or defence-related projects