They're using Perl for some stuff, at least the first version of the website used Perl. One random example: https://medium.com/booking-com-development/how-we-s

They're using Perl for some stuff, at least the first version of the website used Perl. One random example: https://medium.com/booking-com-development/how-we-spent-two-days-making-perl-faster-939457ef16a1 https://medium.com/booking-com-development/how-we-spent-two-...