I kickstarted and was the CEO of a non-profit which functioned for about six months as the shadow covid vaccine location data infrastructure for the U.S. during the early months of the 2021 rollout. We worked with Google, the federally-blessed initiative, California, many county health departments, etc.

My best estimate is many millions of Americans were successfully vaccinated as a result of data we sourced, collated, verified and distributed.

The probable magnitude of the impact is thousands of lives saved.

Our tech stack in the early days was a static site generated with Ruby with search results all in a single JSON file filtered by the client in JS, with the backing data store being Airtable. It got more sophisticated over time.