- WhatsApp: famous for being written in Erlang, a functional programming language, and processing more messages a day than the entire global SMS network with a team of 50 backend engineers
- Discord: handling extreme amounts of chat/call traffic using Elixir, another functional programming language based on the same tech as Erlang
- Telephones: telephone switches from Ericsson (and in fact, internet switches from Cisco) use Erlang
- Docker: core virtualization component for macOS (hyperkit) written in OCaml
- Amazon EC2: another core virtualization component of all computes, parts of the Xen hypervisor, written in OCaml
- WhatsApp: famous for being written in Erlang, a functional programming language, and processing more messages a day than the entire global SMS network with a team of 50 backend engineers
- Discord: handling extreme amounts of chat/call traffic using Elixir, another functional programming language based on the same tech as Erlang
- Telephones: telephone switches from Ericsson (and in fact, internet switches from Cisco) use Erlang
- Docker: core virtualization component for macOS (hyperkit) written in OCaml
- Amazon EC2: another core virtualization component of all computes, parts of the Xen hypervisor, written in OCaml