DHH rewrote Campfire Once from Ruby on Rails to Rust, Elixir, and Go using AI agents without reviewing the code. The rewrites revealed fundamental issues: vague prompts lead to inconsistent architectural decisions across languages, and AI-generated code contains performance problems like blocking operations in async contexts that only careful code review can catch.
EKV is a distributed key-value store for Elixir that uses SQLite as its storage backend and provides eventual consistency with optional per-key linearizable compare-and-swap operations. It replicates data across Erlang nodes using delta sync, survives node failures and network partitions, and offers zero runtime dependencies through vendored SQLite compiled as a NIF.
A Polyglot Conference built a website serving data through APIs written in 27 different programming languages, with each request displaying which language handled it. The site uses Elixir and Phoenix for the frontend, PostgreSQL for storage, and implements caching, timeouts, and prewarming to optimize performance across the diverse backend APIs.