At the timestamp (around 18:11) you can see when he hovers over the CEO link, the bottom of the screen displays "https://openai.com/careers/backend-software-engineer-growth": https://youtu.be/YiS1cJU2zS8?feature=shared&t=1091
Also, there was no archive of the page if you search under the career prefix on the Web Archive: https://web.archive.org/web/*/https://openai.com/careers/*