OCaml All the Way Down -- Jane Street's Radical Bet on Functional Programming

Jane Street made the unusual decision to build their entire technology stack -- from trading systems to monitoring tools to research code -- in OCaml, a statically typed functional language. With 500+ OCaml programmers, 30+ million lines of OCaml, and nearly a million lines of open-source code, this choice defines their engineering culture. This module explains why they chose OCaml, what it means for engineers joining the firm, and why you do NOT need to know OCaml to get hired.