Explore the transition from Object-Oriented Programming to Functional Programming in this conference talk by Vagif Abilov at GOTOpia November 2020. Discover how a team shifted to F# for their next-generation system, handling gigabytes of data hourly with high performance and scalability demands. Compare OOP and FP approaches, examining modeling techniques, business objects, and order processing. Learn about domain modeling in F#, consider adopting FP style in C#, and understand the advantages gained by switching to F#. Gain insights into how functional programming can provide beneficial defaults for rapid development and continuous deployment in high-stakes production environments.