Functional-first programming is now a standard technique in the software industry. But what does it mean to succeed with functional-first programming in real business situations? What sort of business problems is it applicable to, and why do those problems matter? What sort of benefits can you expect if you adopt functional-first programming? How do the business needs map through to features of languages such as F#? In this talk, we’ll take a fun walkthrough case studies, observations, anecdotes and hard-nosed revenue figures to answer these questions.