Calvin French-Owen joined OpenAI in May 2024 when it had 1,000 employees, and left the company in June 2025 after it tripled in size. He worked on Codex, a coding assistant launched in just seven weeks by a dedicated team. French-Owen noted the extraordinary pace at which the product was developed, stating it reached an impressive 630,000 engineers shortly after launch. He emphasized a unique aspect of OpenAI's culture: minimal email communication, with most interactions conducted on Slack. His decision to leave was purely personal, seeking a new beginning without any drama.
Calvin French-Owen shared his experience at OpenAI where he contributed to the Codex project, achieving impressive results in a short timeframe.
OpenAI's team culture emphasized fast-paced work, with Codex being developed and launched in just seven weeks, showcasing a high level of productivity.
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