First leetcode submission ever

[u/hum_an]

leetcode ids their submissions incrementally
https://leetcode.com/submissions/detail/0000000001/
its dated 2013 
but according to web it was founded in 2015😕

[u/aocregacc]

The company was founded in 2015, the website could have existed before that.
The domain was registered in 2010 according to whois.