== RUNTASTIC | SENIOR BACKEND ENGINEER | FULL TIME | AUSTRIA | ONSITE | VISA | == With hundreds of millions of users, we face the challenge of building a top-class backend infrastructure and applications every day. Our main tools of choice to scale our applications are jRuby, Sinatra, Sidekiq, MySQL, and MongoDB.We are currently … Continue reading New comment by Runtastic in "Ask HN: Who is hiring? (May 2021)" →