[mattferderer]

> there's no way to search "startups using x" for a generic technology, like serverless or NoSQL.

1. Make a list of companies & products that implement "serverless" or "NoSQL" or X.

2. There are plenty of tools that search websites to see what they're using. They tend to work better for frontend tech than back though. Sometimes backend tech is visible though. Here's a nice compiled list based off a quick Google Search - https://geekflare.com/what-technology-website-using/

3. Search job boards, industry forums, social media, chat channels (Slack/Gitter/etc), videos, online in general for any mention of those products. You'll get a list of companies using them. Forums, social media & chats will help you see what issues your users are having with them & allow you to build relationships without "cold calling".