Jev FIFA rebuild
Shubhankar's FIFA-style soccer sim where every outfield player runs a ~150 ms Jev loop for tackle, pass, shoot, speed, and direction, plus Jev-driven commentary and soundtrack picks.
by @_shubhankar
Overview
Shubhankar Srivastava (Browserbase, shubhankar.xyz) published a FIFA-style rebuild where every outfield player runs its own Jev loop on roughly a 150 millisecond cadence. Each cycle decides tackle, pass, or shoot plus speed and heading. The same build routes commentary and soundtrack choices through Jev rather than a separate generative audio pipeline. The launch clip on X is the primary public artifact; no repo or hosted play link appeared in the thread as of September 2026.
Problem: Soccer games usually hard-code bot logic or bolt a chat model on top, which is too slow and too vague for eleven independent players plus live presentation layers.
Built for: Builders studying real-time sports sims, Browserbase engineers experimenting with System One, and fans who want proof that Jev can sit inside a 150 ms control loop.
First indexed on Jev Directory: 2026-09-21
Creator and team
- Name
- Shubhankar Srivastava
- Organization
- Browserbase
- Handle
- @_shubhankar
“I rebuilt FIFA with Jev! Each player has a Jev loop running every ~150ms, deciding whether it should tackle, pass, shoot, and with what speed/direction. Heck, even the commentary/soundtracks are Jev!”
How Jev is used
- Role in the product flow
- Per-player real-time action selection plus presentation routing (commentary and soundtrack)
- Primitives
- Choice
- State in
- Per-player match state at each tick (positions, ball context, and other fields implied by the clip; exact schema not published outside the build).
- Decision out
- Discrete soccer actions (tackle, pass, shoot) with speed and direction parameters; separate Jev choices for commentary lines and soundtrack selection per the launch post.
- Simulation advances on a sub-second game clock
- Each player issues a Jev request about every 150 ms
- Engine applies returned actions to movement and ball interaction
- Presentation layer queries Jev for commentary and music choices
The match treats Jev as the reflex layer for every athlete instead of one monolithic bot brain. That matches the System One pattern: structured state in, typed Choice out, no play-by-play prose between ticks. Shubhankar's post also extends the same primitive to broadcast flavor (commentary and soundtracks), which is unusual for sports demos and shows how sidecar presentation systems can share one fast model. Peyton Casper quoted an earlier shootout goalie prototype from the same author; this profile focuses on the full-pitch FIFA rebuild in Shubhankar's September 2026 clip while the Peyton post remains a related showcase embed on this directory.
Sourced performance claims
- Each player runs a Jev loop about every 150 ms.Source: x.com/_shubhankar/status/2101830589620056160
Features and stack
Features
- Eleven independent per-player Jev loops at ~150 ms cadence (attributed post)
- Tackle, pass, and shoot decisions with speed and direction
- Commentary and soundtrack selection also driven by Jev (attributed post)
- Featured homepage showcase video embed on Jev Directory
- Creator site at shubhankar.xyz and GitHub shubh24 for other experiments
Stack
- TypeSafe System One (Jev)
- Custom FIFA-style sim (details not open-sourced in the launch thread)
Demo
Showcase clip with the same lightbox player as the homepage. Click to play.
FIFA rebuilt on Jev loops
Eleven brains on the pitch, each asking Jev every 150 ms whether to tackle, pass, or shoot. Even the commentary queue got promoted from intern to System One.
Shootout goalie with split-second Jev
Before the full FIFA rebuild, Shubhankar's keeper was already diving on typed reflexes. Same soccer itch, smaller pitch, equal panic.
Links
FAQ
- Is there a public repo or playable URL?
- Not in the September 2026 launch thread. This directory lists the attributed X clip and showcase embed until Shubhankar publishes a repo or demo link.
- How does the Peyton Casper goalie clip relate?
- Peyton Casper posted that @_shubhankar built a Jev-powered goalie for a shootout-style soccer game before the full FIFA rebuild. We host both videos as showcases but keep one product profile for the full-match build Shubhankar described.
- Which Jev primitives are documented?
- The public post describes discrete action picks (tackle, pass, shoot, speed, direction) and presentation choices. Treat those as Choice-style decisions; no Score or Noul usage was claimed in the thread.
Related learn guides
Original Jev guidance that pairs with this product pattern.
- Jev use cases
The patterns builders actually search for: moderation, routing, triage, RAG verify, and agent gates.
- Jev vs LLM classification
When to gate with System One probabilities instead of asking a chat model to label things.
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