Case Study: Largest Financial Services Organization achieves seamless Customer Day One IBS conversion and unified accounts with FIS

FIS ensures Customer Day One a resounding success

Largest Financial Service Organization — a newly formed direct bank created by merging two large direct banks (forming an institution with over $30 billion in assets) — needed to rebrand, consolidate back-office systems on IBS, and convert customer accounts with minimal end-customer impact and aggressive deadlines. FIS, through FIS Consulting and its IBS Conversions and IBS Open API teams, led the initiative, providing IBS conversion services, engagement and quality management, and API development (delivered via the FIS Code Connect Gateway).

FIS implemented a multi-phased conversion that ReST-enabled or modified 38 APIs, managed the complex weekend cutover (including merging duplicate customer records so customers were unified on Customer Day One, June 18), and delivered program governance, QA and conversion leadership. The project completed on time and on budget, enabled IRA sweep integration and broader brokerage/insurance and digital capabilities, and generated follow-on engagements — outcomes bank executives publicly credited to FIS.