In this AWS re:Invent 2023 session, Nintendo Systems shares their journey of modernizing the Nintendo eShop backend infrastructure. The presentation covers the transition from a monolithic architecture to microservices, addressing challenges in scalability and agility. Key topics include the implementation of platform engineering to enhance developer productivity and the creation of an e-commerce API platform. The speakers discuss specific AWS services utilized, such as Amazon ECS and API Gateway, to support Nintendo eShop's massive user base of over 120 million Nintendo Switch users. The session provides valuable insights into managing large-scale e-commerce systems and improving development processes for better go-to-market speed.