Some learnings from temporal.io building SDKs for 8 languages

Temporal's SDK team solved the nightmare of maintaining complex workflow logic across seven programming languages by building a shared Rust core with thin language-specific bridge layers. The architecture cut new language development time in half, reduced bugs significantly, and lets a 10-person team support seven languages. Key practical advice: use bridge helper libraries like PyO3 and Neon, leverage codegen, avoid serializing IDLs when possible, and route side effects through the language layer.