Senior Banking Platform Architect – API, AI & Cloud

Ernst & Young Advisory Services Sdn Bhd; Greater London; On-site; GBP 120,000 - 150,000; Full time

Job summary

EY in London seeks a Platform/Integration Architect to define platform services and patterns across APIs and events, enabling scalable, secure digital transformations. You will guide reliability, security, cost controls and collaborate with architects, product owners and engineering leadership to deliver end‑to‑end solutions.

Based in London, the role offers exposure to large-scale financial services transformations and a chance to shape a modern, cloud-enabled platform strategy within EY.

Qualifications

• Experience defining patterns/guardrails and working with multiple delivery teams in parallel.
• Knowledge of identity, secrets, observability and operational controls.
• Strong collaboration with architects, product owners and engineering leadership.

Responsibilities

• Define platform services: API gateway, event mesh, identity/access, reference data, observability and developer tooling.
• Establish API/event patterns and domain contracts across core, channels, ledger, risk and data platforms.
• Contribute to technology strategy (build/buy, cloud/on‑prem) and IT operating‑model changes that improve the business of IT.
• Guide teams on reliability, security, compliance and cost; partner with TMOs on release governance and controls.
• Shape and deliver scalable, resilient, end‑to‑end solutions, ensuring designs are fully considered, robust and aligned to agreed architectural standards.
• Act as the conduit between business and technology functions; translate outcomes into clear design options and actionable plans.
• Provide high‑quality guidance and documentation to enable a rapid, secure path from design to build/run.
• Contribute to business development: shape proposals, provide solution credibility in pursuits, and support mobilisation of wins.
• Develop people and communities of practice; coach junior colleagues and embed reusable patterns, assets and playbooks.

Skills

Platform/integration architecture

API/Event patterns

Cloud services understanding

Cross-team collaboration

Tools

API gateway

Event mesh

Identity/access management

Observability tools

Developer tooling

Job description

EY in London seeks a Platform/Integration Architect to define platform services and patterns across APIs and events, enabling scalable, secure digital transformations. You will guide reliability, security, cost controls and collaborate with architects, product owners and engineering leadership to deliver end‑to‑end solutions.

Based in London, the role offers exposure to large-scale financial services transformations and a chance to shape a modern, cloud-enabled platform strategy within EY.