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Usernames often look like a small implementation detail when you’re building a product. You add a uniqueness check, maybe block a couple of obvious cases like admin, and move on. But as products grow, usernames quietly turn into a real problem. People register admin, support, or system. Brand and impersonation-prone usernames slip through. Short or high-value handles get taken early. To fix it, teams start maintaining internal “reserved username” lists that keep growing over time. What began as a simple array slowly becomes brittle logic, scattered rules, and long-term tech debt. username.dev exists to solve that problem properly. It’s a focused, API-first service that helps apps govern usernames from day one. Instead of hardcoding rules or constantly patching edge cases, teams can rely on a single API to detect and block reserved, premium, or risky usernames during signup.