ETSY IS A PHP SHOP Yes, but... we use a lot of Javascript, Typescript, Python, Ruby, C, C++, Java, Go, Objective C, Swift, Kotlin, Rust, Scala, Dart as well It depends on the team Some teams barely touch PHP, if at all Web Serving Stack Linux, Apache, MySQL, PHP Memcache, Gearman, StatsD, Vitess, Redis, Kafka, Varnish GCP, Terraform API First! Global, Internal Load Balancer Managed Instance Groups Many other stacks not shown, like beacons, assets, downloads Gearman for longer-running Asynchronous tasks Crons for non-request triggered