“I went to Reddit, I checked the subreddit of notion and search for keywords like sheets, Google sheets, excel, CSV — all related keywords to what I was trying to build and validate — and I found a lot of people trying to export the information from notion into sheets.”

Validate by searching Reddit for demand before writing a line of code

When Notion released their official API, Leandro spotted a gap but didn't assume demand existed. He went straight to Reddit and searched problem-adjacent keywords to confirm real user pain before committing to build anything.