Screenshotbot, a web service provider, has successfully built a highly available architecture without relying on traditional databases. The company's CEO, Arnold Noronha, shares their stack, which includes Common Lisp, bknr.datastore, and custom-built libraries like Raft and EFS (Amazon Elastic File System). This setup enables seamless handling of concurrency, hot-reloading code, and high availability. The architecture has been tested with a large enterprise customer, resulting in impressive scalability and low CPU usage.

Source: https://blog.screenshotbot.io/2024/08/10/building-a-highly-available-web-service-without-a-database/