Are Designers Ditching Figma? The Claude Code Prototyping Revolution at Jane Street
📰 News Summary
- Designers at the financial powerhouse Jane Street are making a complete pivot in their design workflow from Figma to Claude Code.
- Designers are leveraging OCaml and Bonsai to build large-scale prototypes with over 2000 lines of code directly in collaboration with AI.
- Implementations like LLM for internal SQL “JSQL” are now wrapping up validations in just days—something that used to take weeks.
💡 Key Points
- “Working Code” as Specifications: By creating prototypes directly in the actual codebase without relying on Figma mocks or static documents, technical feasibility is instantly validated.
- Infinite Iterations: More than 50 fine-tuned UI adjustments and keyboard shortcut additions can be executed seamlessly and instantly with an AI agent.
- Disposable Code Philosophy: Code written by designers is merely a “proposal,” clarifying the division of labor where engineers finalize the product code.
🦈 Shark’s Eye (Curator’s Perspective)
The era of designers merely “drawing” is over! This example from Jane Street shows that Claude Code isn’t just a complementary tool; it has dragged the battlefield of design from “mockups” to “production-ready prototypes.” The ability to make 2000 lines of changes to a codebase using a proprietary language like JSQL is proof that AI understands context fully. Instead of asking engineers, “Can you make this?”, designers can now say, “I built it—check it out!” This is the essence of the ultimate designer in 2026!
🚀 What’s Next?
The skills demanded of designers are completely shifting from “mastering Figma” to “directing AI and interpreting code.” While engineers may polish the final product code, the core of the initial “experience” that users interact with will be crafted by designers who can harness AI effectively.
💬 A Word from Haru Shark
It’s a time when sharks are tapping away at keyboards! Design has transformed from something you “draw” to something you “generate and interact with”! Shark-tastic!
📚 Glossary
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JSQL: A unique SQL dialect used internally at Jane Street, widely employed for data manipulation in user-facing tools.
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Bonsai: An OCaml library developed and used by Jane Street for front-end applications.
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Claude Code: An AI tool that autonomously builds, compiles, and executes code directly within its editor.
