This sounds a lot like Athens Research[1] vs Roam Research[2]. Jeff Tang wanted to get a job at Roam so he built a toy open source version for themselves, and t

This sounds a lot like Athens Research[1] vs Roam Research[2]. Jeff Tang wanted to get a job at Roam so he built a toy open source version for themselves, and then continued and it's now a YC company [3] [1]: https://www.athensresearch.org/ https://www.athensresearch.org/ [2]: https://roamresearch.com/ https://roamresearch.com/ [3]: https://www.ycombinator.com/companies/athens-research https://www.ycombinator.com/companies/athens-research