Location
Paternoster Square, London

Hours
Full Time

Salary
Negotiable

About the Role
We are seeking an expert Senior Architect to drive the technical vision, system design, and architectural governance for a large-scale, technically diverse engineering program. Operating across multiple complex domains, you will serve as the premier technical authority, designing mission-critical enterprise systems, overarching data ecosystems, and leading our artificial intelligence (AI) integration strategy. You will set the architectural target state, establish design patterns for highly resilient systems, and ensure technical coherence across a highly heterogeneous technology stack. Partnering with business stakeholders and engineering management, you will translate strategic objectives into robust, scalable, secure, and AI-ready architectures within a highly regulated, high-expectation environment.

This role requires pragmatic execution, hands-on prototyping, and deep collaboration with delivery teams. You will lead architectural governance, champion AI adoption, and mentor senior engineers while maintaining technical excellence and long-term platform health. You will work within a broad and evolving technology landscape including Java, .NET, Python, cloud-native microservices, Databricks, Microsoft Fabric, Azure, AWS, and AI/ML platforms.

Join London Stock Exchange Group and be part of a dynamic organisation that values innovation, quality, and continuous improvement. You will contribute to a culture built on integrity, partnership, excellence, and change, supporting financial stability and sustainable growth globally.

Experience
- 8+ years of hands-on software engineering experience, including 3+ years as a Principal or Senior Architect designing large-scale, high-throughput, mission-critical enterprise distributed systems.
- Advanced data architecture experience with Databricks, Microsoft Fabric, and large-scale data processing patterns such as Data Mesh and Lakehouse.
- Proven expertise in designing highly available Hybrid and Multi-Cloud architectures (Azure & AWS).
- Experience designing AI/ML architectures, integrating Large Language Models (LLMs), predictive analytics, and vector search.
- Deep understanding of security architecture, secure SDLC, data privacy, and compliance in the financial services sector.
- Strong knowledge of resilience and SRE principles, including fault-tolerant architectures and cloud-native resilience patterns.
- Exceptional stakeholder communication and matrix leadership skills, influencing cross-functional teams and executives.

About you
- Visionary technologist who thrives under pressure and sets uncompromising engineering standards.
- Hands-on leader comfortable with prototyping, PoCs, and technical investigations.
- Skilled at balancing enterprise standardization with agile team autonomy.
- Trusted advisor able to articulate complex technical trade-offs in business-centric language.
- Able to rapidly build context across diverse technology stacks and domains.

Qualifications
- Demonstrated architectural abstraction skills across varied technology stacks.
- Experience working in highly regulated, complex environments.
- Commitment to continuous learning and innovation in AI and cloud technologies.