Adopting F# on a Consultancy Project: From Zero to MVP to V0 Launch

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If not everywhere, certainly in Brazil, it is hard to employ functional programming languages on a enterprise use case. Customers often prefer solutions they already know — especially on consultancy jobs.

This is the story of what happened when a customer gave us full autonomy on tech choices — giving us the chance to build an application from the ground up, with whatever tools we found best — and for us, that meant full stack F#.

We've been enthusiastic about the idea for years, and we all had toy projects w/ F#, but putting up a production server required us to solve many problems. Data sensitivity, concurrency control, massive machine learning jobs — we've done it before, but this time we did it with F#.

This talk compares the developer experience with and without strongly typed functional programming. This is a talk of the courage it takes to make the choices we made, and the pay off.

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