Job Title: Principal Solution Architect * Lead the end-to-end architecture and design of IT solutions within the assigned delivery portfolio of Fulfillment, Assurance, Plan and Build, and drive application portfolio simplification. * Collaborate with the Customer's Enterprise Architect, and contribute to define overall OSS and end state strategy & architecture and alignment with Business Goals. * Produce supplementary Solution Architecture roadmaps to further elaborate on the Enterprise Architecture roadmap for given domain to enable specific guidance to the Solution Design. * Create reference blueprint/models covering business capabilities, process models, and data models. * Ensure IT solutions and architecture artefacts including the Architecture Steer and High Level Architecture are compliant with Business Vision, Enterprise Architecture blueprints and technology & infrastructure roadmaps. * Review design artefacts for the OSS solution produced by internal and/or external teams to ensure alignment with the end state architecture, regulatory frameworks, maximises reusability. * Facilitate solution alignment across multiple business units, especially where product consumption chains exist, integrating OSS, processes, operations, and network