Recently happened to me. Founders raid the series c for liquidity. Take out a predatory note to keep the company afloat. Sell the company in a fire sale and reap transaction bonuses, RSU grants, etc. Common stock wiped out and those that built the company left with nothing. Lesson learned? It rarely pays to be an early employee at a startup.
Looks like Quri (https://angel.co/quri-1). All you had to do was Google OP's handle and dig into where they worked recently that had their characteristics
Definitely a great lesson to be learned. I'd be interested in some stats on the average payout percentage for engineers of acquired startups (broken down by tenure, obvi).