Why Reliability Demands Functional Programming: ADTs, Safety, and Critical Infrastructure

In banking, telecom, and payments, reliability is not a nice to have. It is table stakes. The most reliable systems I have worked on reduce entire classes of bugs before the code even runs. Functional programming and Algebraic Data Types (ADTs) let you push correctness into the type system, so illegal states cannot be constructed in the first place. What you will learn How invalid states show up…