Greybeard with 26 years in the industry. Sorted in decreasing order of impact:
[1] Back in 2006, created a web scraper with .Net framework and C# that helped my wife run a home-based scraping business for 2 years. There were no tools / libraries / frameworks for spidering / scraping back then - or at least I wasnt aware of them. Helped her have a replacement income since she had quit her job for maternity. She of course enhanced it and made it better. Was fun while we were the early ones in it.
[2] SAP's Community Network in 2002: Supports a million users today, started with a much smaller user base of 10k, implemented it from scratch as a Java MVC web-app with another colleague.
[3] Amazon Ads in 2015: Contextual commerce ads in review websites and blogs, this single product drove (and still continues to drive) multi-hundred million dollars in incremental revenue for AMZN every year. HN doesnt like the Advertising business, but hey.
[1] Back in 2006, created a web scraper with .Net framework and C# that helped my wife run a home-based scraping business for 2 years. There were no tools / libraries / frameworks for spidering / scraping back then - or at least I wasnt aware of them. Helped her have a replacement income since she had quit her job for maternity. She of course enhanced it and made it better. Was fun while we were the early ones in it.
[2] SAP's Community Network in 2002: Supports a million users today, started with a much smaller user base of 10k, implemented it from scratch as a Java MVC web-app with another colleague.
[3] Amazon Ads in 2015: Contextual commerce ads in review websites and blogs, this single product drove (and still continues to drive) multi-hundred million dollars in incremental revenue for AMZN every year. HN doesnt like the Advertising business, but hey.