Gumiyo is a mobile platform that connects buyers and sellers, acting as a personal shopper for buyers and providing mobile tools for sellers. The platform allows sellers to create a mobile homepage that buyers can access to view listings and contact the seller directly from their phone. Gumiyo uses Amazon Web Services (AWS) to host its infrastructure in a cost-effective and scalable way, allowing it to focus on developing its product instead of managing servers. Some key AWS services used include EC2 for compute, S3 for storage, and SQS for messaging between components.