Code is the easy part, or how we refactored half the business to fix a janky script

This article recounts the engineering journey of refactoring a rapidly growing startup's billing system, originally a creaky Python script, to handle 5x revenue growth toward unicorn status. The author describes the accumulation of tech and product debt, manual workarounds, and stressful month-end invoicing. The team's approach involved simplifying the problem, then solving it systematically, leading to automated invoicing that reduced stress and time. The story emphasizes the importance of addressing technical debt and the challenges of scaling business-critical systems in a fast-paced startup environment.