The author shares their approach to running multiple $10,000 monthly recurring revenue (MRR) companies with a $20/month tech stack. They emphasize the importance of keeping costs low and using efficient technologies such as a single Virtual Private Server (VPS), Go programming language, and SQLite database. The author also discusses the use of local AI for long-running tasks and GitHub Copilot for coding. By utilizing these strategies, the author is able to maintain a lean and scalable startup.