How to Tell a Product Is Good Enough to Modularize
How do you know a product is good enough to modularize?
Product-market fit needs both demand validation and retention validation. Demand means people buy it, use it, and would be upset if it disappeared. The article cites the survey threshold: 40% or more saying they would be very disappointed. Retention means users keep coming back, shown by a curve that flattens above zero, by cohorts that retain better over time, and, for B2B, net revenue retention above 110%. Product-market fit alone does not say modularize. You also need cost pressure: rising variable cost per customer, slower feature development, and growing engineering effort per change. Product-market fit plus cost pressure is the decoupling point.
What does modularizing at the wrong time cost?
Too late, and every feature touches multiple components, cost per customer rises as the integrated system hits its scaling ceiling, and features drift off the job that made the product succeed. Too early, and you modularize around guesses. The article cites research that startups adopting microservices before product-market fit take up to 45% longer to ship a first viable product. Integration still wins while performance requirements are evolving. Stable interfaces need a job you already understand.
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