FUN OCaml

WARSAW

September 15 & 16, 2025

PROGRAM

Fun OCaml 2025 is a 2 days open source hacking event dedicated to OCaml enthusiasts and professionals around the globe!

Let's get together for an exhilarating event packed with creativity, innovation, and learning:

Talks are live-streamed and will appear on watch.ocaml.org and the FUN OCaml YouTube channel after the event.

The talks from the event will be live streamed free of a charge. We recommend subscribing to FUN OCaml's YouTube channel!

September 15 - 9:00-24:00

September 16 - 9:00-22:00

September 15 - 9:00-18:15

Time	Great Hall	Foyer
8:00 - 9:00		Arrival, small breakfast
9:00 - 9:10	Organizer Announcements
9:10 - 9:45	A Vision for OCaml in the AI Era Thibaut Mattio
9:45 - 9:50	Introducing the OCaml Security Team (OCSF) Hannes Mehnert
9:50 - 10:00	Break
10:00 - 10:35	Purely functional gRPC and HTTP/2 with OCaml Adam Cholewiński
10:35 - 11:10	From OCaml 4 to 5 and from Parmap to Effects: A legacy code transition story Nathan Taylor and Nat Mote
11:10 - 11:20	Break
11:20 - 11:55	Analyzing Programs with SMT Solvers Tikhon Jelvis
11:55 - 12:30	OxCaml From a System Engineer's Point of View Dmitriy Kovalenko
12:30 - 13:50		Lunch break
13:50 - 14:25	Frameworks: No, Libraries: Yes. Developing a Product in OCaml From Scratch Malcolm Matalka
14:25 - 15:00	Performance Pitfalls: Tales From a Python/OCaml Codebase Emma Jin
15:00 - 15:10	Break
15:10 - 15:45	OCaml at LexiFi Nicolas Ojeda Bär
15:45 - 16:20	Generating Static Websites the Functional Programming Way Xavier van de Woestyne
16:20 - 16:40	Break
16:40 - 17:15	I Can See The Pixels: Designing Cross-Stitch Patterns in OCaml Mindy Preston
17:15 - 17:50	Slipshow: A Full-Featured Presentation Tool in OCaml Paul-Elliot Anglès d'Auriac
17:50 - 18:15	Wrap up
18:15 - 24:00		Dinner, Socializing & Hacking

September 16 - 9:00-22:00

Time	Workshop A	Workshop B	Foyer
8:00 - 9:30			Arrival, small breakfast
9:30 - 11:45	Build Language Models with Raven Thibaut Mattio	Hacking the OCaml Compiler to Add Type Reflection Nicolas Ojeda Bär
11:45 - 14:00	Train a Reinforcement Learning Agent for the Box-Pushing Game Sokoban in OCANNL or Raven Lukasz Stafiniak	Vif & Hurl, a Web Framework for OCaml 5 Romain Calascibetta
14:00 - 15:30			Lunch break
15:30 - 18:00	OCaml Observability with OpenTelmetry Austin Theriault	React in OCaml with Melange David Sancho Moreno
18:00-22:00			Dinner, Socializing and Hacking