“The combined effect of better architecture and Elixir saved Pinterest over $2 million per year in server costs.”
The headline credits Elixir. The engineer who did the work credits better architecture and Elixir together. One system went from 200 Python servers to four, which is what a rewrite of a system you finally understand does in any language. The quote comes from a 2018 book co-written by José Valim, recycled in 2023 by a company that sells security tooling only for Elixir.