I do not talk about this one much but I think it belongs here. A few years ago we were chasing a $3.2 million county transportation contract. Strong fit. Agency we knew. Team we were proud of. Proposal we had put real effort into. We lost. Evaluation feedback: past performance did not meet requirements. Here is what happened. The RFP required three references for projects completed as prime consultant within the past 7 years. We submitted three excellent projects. But one was from 8 years ago. We miscounted by one year. One sentence in an 87-page document. One wrong year. Disqualified before a single evaluator read our technical approach. That loss built the compliance process we use today. Compliance matrix built first, before any writing starts. Every requirement documented. Second-person review before submission. Dates on every past performance reference verified against the exact requirement language. We have not had a compliance disqualification since. I built part of RFP PursuitAI Hub specifically to automate this step because I never wanted anyone else to lose work they earned on a technicality. I am sharing this because I think the best communities are built on real stories, not polished ones. And because every single one of you has a version of this story. What is the proposal loss that taught you the most? Drop it in the comments. No shame here. Just learning.