How engineers at Nextdoor use Codex to build without limits

OpenAI published a customer story showing how engineers at Nextdoor, a neighborhood network serving more than 105 million people, use the Codex coding agent running on GPT-5.5 to build software and fix hard problems. Cory Dolphin, Head of Engineering, says one engineer now owns a feature from idea to production, work once split across three teams. According to Nextdoor, the main constraint is no longer engineering effort but deciding what to build next.