Rubén Fernández

Solution Architect with 20+ years turning business needs into end-to-end solutions — functional, technical, security and resilience — with a strong focus on banking. Today, as Chief Client Architect at Capgemini, I act as a cross-cutting technical reference for CaixaBank, where I led the re-engineering of the payments platform to increase the resilience of Bizum transactions. Before that, at ING, I designed and built backend solutions for the mortgage broker channel on microservices, REST APIs and Kafka. What I bring: • End-to-end solution models, trade-off analysis and architecture governance (C4, ADRs) • Resilient, highly available and event-driven architectures • Public cloud: led the cloud-native re-engineering of a video-surveillance backend on AWS (Lambda, SQS, DynamoDB) at Securitas Direct; Azure • Close collaboration with Product Owners, Tech Leads and business stakeholders • Applied GenAI: multi-agent systems (LangGraph, MCP/A2A), RAG, and LLMs to speed up architecture work such as drafting and reviewing ADRs It all started with an Amstrad CPC 464 — the curiosity is still the same.