This 2025 case study describes how a leading US bank (managing $200B+ in assets and serving venture-backed startups) modernized a legacy online banking platform that suffered from poor maintainability, limited scalability, outdated UI, and performance constraints, while needing strict compliance and high availability. Brillio implemented a domain-driven, microservices architecture using an API-first approach to decouple services and accelerate new digital capabilities, supported by co-innovation workshops and proofs of concept. Migration risk was reduced using pre-migration APIs for data validation, an Appian-driven user and data migration flow, and post-migration reporting to verify integrity. Results included 5x faster migration velocity per batch run, 85% workflow automation, 99.9% avai

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