While software constraints can be beneficial, picking the right ones is crucial. Three game-changing paradigms that have seen success are functional programming, immutability, and reactive programming. Functional programming promotes composability, testing, parallelization, maintainability, and reliability through declarative verbosity. Immutability leads to benefits such as "time-travel" functionality, better observability, and safer concurrency. Reactive programming applies declarative computing principles to data streams, enabling composable, scalable automation by chaining reactive programs together. By applying these lessons to software deployment, Netlify's approach focuses on functional deployment, immutable deployment, and reactive deployment, streamlining development speed and reducing bugs, while also providing features like continuous deployment and A/B testing.