Publicis Sapient brought in Sapient Slingshot to change the game. Our solution helped cloud-native developers—without COBOL experience—migrate legacy code to a modern microservices architecture. We used generative AI to produce functional specs, behavior-driven development stories, optimized user interface screens and clean, maintainable code in Java and React. Our engineers then reviewed, refined and validated every output, so speed never came at the cost of quality. We worked with the business team to validate the modernized application, confirming it retained core functionality while providing a better user experience. Delivered as a service with outcome-based pricing, the approach gave the client speed, predictability and cost control while building trust in a new way of modernizing.