JuliaCon2020: Julia Is Production Ready
Invenia had run Julia for our primary production system for over a year (nearly 2).The size of our Julia codebase is about 400,000 lines of code, spread over numerous internal and open source packages.
You can cite the "we're hiring" slide from my Juliacon talk for that 
https://raw.githack.com/oxinabox/ChainRulesJuliaCon2020/main...