Hi! I'm Johan Tjuatja.
I code for work and hobby.
While this site shows what I do during my free time,
you can find out what I do at work here.
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Strata

A convenient backtesting app.

  • Implement your strategy quickly in Python with pandas.
  • Install your favourite (pyodide-supported) Python packages.
  • Access historical OHLCV of 400+ stocks in different frequencies.
  • Quickly display your strategy returns.
Try it!Check it out
An example of AI agent built with Jaiger.

Jaiger

An MCP-inspired LLM tool framework.

Like MCP, it allows you to build AI agents.
Unlike MCP, it makes building CPU-intensive tools and parallelizing tool calls easy.
Check it out
An example of AI agent built with Jaiger.

Chope

A HTML and CSS DSL for Python.

It allows you to write HTML and CSS directly in Python.
Fun fact: This site is written entirely with Chope.Check it out