Derrick Ko
Product Engineer, Kicksend

Website | @derrickko

Derrick is the first employee and product engineer at Kicksend, a Y Combinator funded startup that lets you privately send large batches of photos, videos and other files to people you love. Prior to that, he was a software engineer at Pivotal Labs, where he led teams and worked with clients that ranged from startups to enterprises. A founder himself, Derrick started a company in Singapore back in 2007. He occasionally blogs about startups and product development at


We created Mailcheck.js to help users type in their email addresses accurately. Mailcheck is now a top 100 most watched Javascript project on Github, and has been adopted in web applications like Kicksend, Dropbox and Uber. More importantly, it's an example of how something simple can have a huge impact. Simplification is hard. Here's how we did it.


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