Business Systems Architect Principal

Why BT International?

At BT International, our purpose is to keep the world connected. As part of BT, we build on almost 180 years of innovation and expertise to deliver secure connectivity and digital services to some of the world’s leading multinational businesses and organisations. Our customers trust us to safeguard their data, drive their digital transformation and keep their businesses running.

With colleagues on the ground across the world and supporting customers wherever they need to operate, BT International offers a truly global experience. Whether it’s about providing cloud connectivity, helping organisations collaborate, or enabling innovation in cybersecurity and digital services, you’ll be part of a team that shapes how businesses succeed in a world that is being transformed by AI.

If you have the drive and ambition to make an impact on a global stage, BT International is where it happens.

Why this job matters

The Business Systems Architect Principal is central to BT International’s transformation from traditional telco operations to asset-light service delivery excellence. This role owns the architectural vision for BAU systems (sales, service, enterprise) and service operations transformation (AI Ops, Service Desk, L2C, billing, inventory) that directly impact operational efficiency, cost-to-serve and customer satisfaction. This architect ensures legacy systems remain cost-effective whilst establishing future-ready capabilities for NaaS-based operating model. This position leads business systems modernisation, establishes API-first integration patterns across service operations and collaborates with senior stakeholders. By aligning business systems architecture with BTI transformation imperatives and multi-year efficiency programmes, the role ensures BT International remains competitive, agile and customer-focused in a rapidly evolving global landscape.

What you will be doing – your accountabilities

1. Define and lead the architectural strategy for business systems across BAU applications (sales, service, enterprise) and service operations (AI Ops, Service Desk, L2C including Pricing/Design/Quoting/SRM, billing, inventory), establishing target state architecture that optimises legacy systems whilst designing future-ready capabilities

2. Own the business systems portfolio optimisation roadmap, making strategic keep/modernise/retire decisions for BAU systems and service operations platforms based on technical fitness, cost-effectiveness and alignment with asset-light, NaaS-based operating model

3. Establish systems integration approaches that link together BAU applications, service operations platforms and NaaS capabilities, enabling functional operation across sales, service and enterprise systems whilst supporting business processes

4. Lead vendor strategy for business systems platforms including SaaS applications, enterprise systems and service operations tools, negotiating strategic partnerships that simplify IT landscape whilst aligning with aaS business needs and reducing vendor dependencies

5. Champion modern architecture patterns including service operations automation, AI-driven process optimisation, billing automation, inventory accuracy improvement and self-service capabilities that reduce manual propensity and improve cost-to-serve metrics

6. Design for operational excellence by establishing comprehensive observability across business systems including metrics, logging, distributed tracing and telemetry that enable proactive issue detection and support continuous improvement in service delivery

7. Collaborate with Data and AI architects to leverage data platforms and AI capabilities for business intelligence, service automation and customer insights, ensuring business systems generate valuable data and support AI-driven process improvements

8. Drive architectural governance through design reviews and architecture conformance processes, ensuring business systems initiatives align with enterprise standards, security requirements and support transformation to asset-light operating model

9. Build and mentor Business Systems architects who work with BAU operations and service delivery teams, establishing technical leadership capability and fostering architectural thinking across support, maintenance and enterprise systems functions

10. Work with engineering leadership to establish integration patterns that connect business systems with NaaS capabilities, enabling sales and service operations to leverage network-as-a-service whilst maintaining operational stability and cost-effectiveness

The skills you’ll need to succeed

Strategic Architecture Leadership – Proven ability to define and communicate architectural vision for complex business systems landscapes, with track record driving large-scale transformation programmes in regulated telco environments

Business Systems Domain Expertise – Deep understanding of BAU systems (sales, service, enterprise applications) and service operations platforms (service desk, AI Ops, lead-to-cash, billing, inventory) with knowledge of how these capabilities support business operations and cost optimisation

Systems Integration – Extensive experience linking together various IT systems, services and software across BAU applications, service operations platforms and NaaS capabilities to enable functional operation and support business processes

Vendor and Stakeholder Management – Strong ability to work with SaaS platforms and enterprise vendors as strategic partners, negotiate technical implementations and manage complex stakeholder relationships across business and operational teams

Modernisation Patterns – Expert knowledge of incremental modernisation approaches including service operations automation, AI-driven process optimisation and cloud-native patterns that balance operational continuity with transformation

Technical Depth – Hands-on background in business systems integration and service operations with coding capability, enabling credibility with engineering teams and active participation in technical spikes when needed

Operational Excellence – Understanding of comprehensive observability, service resilience and operational automation approaches including metrics, logging, distributed tracing and telemetry pipelines for business systems

NaaS Integration Understanding – Knowledge of how BAU systems integrate with network-as-a-service models, enabling sales and service operations to leverage aaS capabilities whilst maintaining operational stability

Leadership and Influence – Ability to lead blended IT teams (support, maintenance, BAU systems, service operations) through transformation, build consensus across organisational boundaries and develop technical leadership capability in operational functions

Leadership accountabilities

1.    Owning outcomes: I take the right decisions that benefit the broader organisation
2.    Delivering for the customer: I execute brilliantly on clear priorities that add value to our customers and the wider business.
3.    Growth mindset: I experiment and identify opportunities for growth for both myself and the organisation

Experience you’d be expected to have

• Extensive experience leading IT systems and BSS architecture in telecommunications or complex B2B environments, with demonstrated success modernizing legacy landscapes across multiple system domains
• Proven track record defining and executing architectural strategies that enabled large-scale system rationalization, vendor consolidation and platform transformation while maintaining business continuity
• Significant experience establishing API-first integration architectures in complex enterprise environments, including work with API management platforms, event streaming and microservices patterns
• Strong background working with major enterprise platforms (Salesforce, ServiceNow, Microsoft) and telco-specific BSS vendors, including negotiating technical approaches and influencing vendor roadmaps
• Experience building and leading architecture teams, with track record developing technical leadership capability and establishing architectural practices that scale across product engineering organizations
• Demonstrated success working in product operating models and agile contexts, with understanding of how architecture enables rather than constrains product team autonomy and delivery velocity
• Background in telco operations and BSS domains with deep understanding of the technical and organizational challenges in transforming mission-critical systems that directly impact revenue

Key decisions

This role is accountable for all decisions within the remit of this job description reporting directly into the CTIO.

Being trusted: Our code

Compliance with all BT Group policies is mandatory and applies to all BT Group employees. Policies can be accessed via the  Policy Portal and should be adhered to in-line with Standards of Behaviour Policy and Procedure and the Being trusted: our code.

What we offer

Compensation and benefits:
•    Attractive salary
•    Cafeteria package  - HUF 600,000/ year
•    Performance-based bonus 
•    Comprehensive private health care package for all the employees, which can be extended to family members
•    Nursery support for mothers returning from maternity
•    Extended paternity leave: 10+10 day fully paid days
•    Commuting allowance
•    Home office allowance 
•    Employee discount opportunities 
•    Highly affordable mobile packages for the family as well

Work atmosphere and community:
•    New high-class offices both in Budapest and Debrecen
•    Wide-range of company and community programmes (including support for different sport activities)

Flexibility:
•    Family-friendly culture
•    Smart working approach (hybrid working model, 3 together, 2 wherever)

Our leadership standards

Looking in:
Leading inclusively and Safely
I inspire and build trust through self-awareness, honesty and integrity.
Owning outcomes
I take the right decisions that benefit the broader organisation.

Looking out:
Delivering for the customer
I execute brilliantly on clear priorities that add value to our customers and the wider business.
Commercially savvy
I demonstrate strong commercial focus, bringing an external perspective to decision-making.

Looking to the future:
Growth mindset
I experiment and identify opportunities for growth for both myself and the organisation.
Building for the future
I build diverse future-ready teams where all individuals can be at their best.

In case of internal application

In case of internal application please do not forget to inform your line manager about your willingness for the internal move. Please note that the future manager might ask for reference about you from your current line manager. Please also bear in mind that your salary will not be adjusted automatically, but the new Line Manager can request it via off-cycle process.