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IT Systems Architect Principal

United Kingdom, Aberdare · Job Posted March 25, 2026
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Job Description

The IT Systems Architect Principal is central to BT International's ability to deliver products at velocity while maintaining operational excellence. This role owns the platform transformation and vendor rationalization strategy that directly impacts product team autonomy, cost efficiency and speed to market. This architect ensures every architectural decision drives product velocity and long-term value. This position leads vendor rationalization, establishes composable platform patterns and collaborates with senior stakeholders. By aligning platform architecture with business imperatives and group strategy, the role ensures BT International remains competitive, agile and customer-focused in a rapidly evolving global landscape.

Job Responsibility

  • Define and lead the architectural strategy for IT systems and BSS modernization across BT International, establishing the target state architecture that guides system rationalization, vendor consolidation and platform transformation initiatives
  • Own the application portfolio rationalization roadmap, making strategic keep/modernize/retire decisions based on technical fitness, business value and architectural alignment while managing stakeholder expectations
  • Establish API-first integration architecture that decouples BSS systems from each other and from product applications, creating clear service boundaries that enable independent team delivery and reduce system dependencies
  • Lead vendor rationalization strategy across SaaS platforms, on-premise systems and cloud-based solutions, reducing vendor dependencies through strategic build vs buy decisions and phasing out unnecessary third-party systems in favor of composable in-house capabilities
  • Champion modern architecture patterns including microservices, event-driven integration and API gateways that enable incremental transformation without big-bang rewrites
  • Collaborate with Data & AI architects to ensure IT systems generate high-quality data with proper lineage and governance, enabling analytics and AI capabilities across the platform
  • Drive architectural governance through design reviews and architecture conformance processes, ensuring solutions align with platform standards while empowering team autonomy and decision-making
  • Participate in technical spike work and proof-of-concepts to validate architectural decisions, evaluate integration approaches and prove out modernization strategies before committing to full implementation
  • Provide technical thought leadership on emerging platform architecture trends including composable architecture, API management and platform engineering, translating these into roadmaps that align with BT International's platform strategy
  • Mentor architects and engineers, fostering architectural thinking and technical leadership capability across both the architecture and product engineering organizations

Requirements

  • Strategic Architecture Leadership – Proven ability to define and communicate architectural vision for complex enterprise landscapes, with track record driving large-scale modernization programs in regulated industries
  • BSS Domain Expertise – Deep understanding of telco BSS systems including billing, order management, product catalog, CPQ and customer lifecycle management, with knowledge of how these capabilities support business operations
  • Platform Integration Architecture – Extensive experience designing API-first integration architectures, event-driven patterns and service abstraction layers that enable loose coupling in complex system landscapes
  • Vendor & Stakeholder Management – Strong ability to work with enterprise software vendors as strategic partners, negotiate technical implementations and manage complex stakeholder relationships across business and technology teams
  • Modernization Patterns – Expert knowledge of incremental modernization approaches that minimize risk while enabling continuous delivery
  • Technical Depth – Hands-on background in systems integration and architecture with coding capability in at least one language, enabling credibility with engineering teams and hands-on spike work when needed
  • Platform Engineering Mindset – Understanding of platform-as-a-product principles, developer experience design and how to build self-service capabilities that enable team autonomy at scale
  • Telco Transformation Context – Experience navigating organizational and technical challenges of telco modernization including regulatory requirements, billing accuracy, revenue assurance and operational continuity
  • Leadership & Influence – Ability to lead through influence rather than authority, build consensus across organizational boundaries and develop technical leadership capability in others
  • System Design
  • Market Analysis
  • Change Management
  • Data Privacy
  • Product Roadmapping
  • Cloud Computing
  • Solution Design
  • Strategic Planning
  • Technology Governance
  • Agile Methodologies
  • Enterprise Architecture
  • Decision Making
  • Project/Programme Management
  • Growth Mindset
  • Standards Design
  • Business Analysis
  • Inclusive Leadership
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