The author of the article has been working on the same software product, PerfectTablePlan, for 20 years, and it has been profitable every year since its launch. The product is a table seating planning software that has been used by famous organizations and for high-profile events. The author has chosen to keep the business small and flexible, allowing for a good work-life balance. The software has undergone several updates and improvements over the years, with the latest version being released in 2024.