The company, Auto Trader UK, is a leading online marketplace for buying and selling used cars in the UK. They previously relied heavily on Oracle and SQL Server, but recognized the need to adopt a more agile approach with open-source technologies like MongoDB. After successfully migrating to MongoDB Atlas on Google Cloud Platform, they were able to improve their database management, scalability, and application development capabilities. The migration was done in three steps: creating a timeboxed proof of concept, arranging owners and applications, and analyzing infrastructure. Auto Trader also shares valuable tips for future migrations, such as upgrading driver versions, using connection pools, and carefully controlling data purging policies. Their experience demonstrates the benefits of adopting a cloud-based approach with MongoDB Atlas, including improved availability, monitoring, scalability, and application development capabilities.