An express based back-end service that periodically fetches RETS data from multiple MLS servers using Node.js RETS client. Data from each server is then normalized and processed and used as the database for a prominent real estate company in the US. Key Learnings: How to handle large volumes of data and optimize resource utilization while processing a massive amount of data. How to setup and tweak Azure cloud for node js applications, how to use Azure file storage and cosmosdb.