Software that fits the way your team already works.
Three Tree Software builds custom tools, web apps and practical AI features for small teams and nonprofits, and explains every step in plain English.
What I do
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Custom software
Web apps, internal tools and integrations built around the work you already do. Python, Django and Postgres by default, and whatever else the job needs.
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Technical consulting
A second opinion on a build-or-buy decision, a vendor proposal or a privacy question, or a plan for turning a prototype into something people can rely on.
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Practical AI tools
AI features for small teams and nonprofits that do one job well, with clear rules about what data goes where and what gets kept.
Recent work
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From prototype to live pilot
Took an AI tool that writes personalized two-week learning plans from a university prototype to a live pilot with families, for a small nonprofit that serves homeschooling families. Django, Postgres and the Claude API, hosted on Render.
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Clean-energy software
Development on the simulation engine, web app and cloud pipeline for an early-stage clean-energy company.
About
Three Tree Software is Jon Kaimmer, a software developer in Burien, Washington. You work with me directly, from the first conversation to the last deploy.
The name comes from Three Tree Point, on Puget Sound in Burien. Around 1900 three big fir trees stood there, and boats steered by them. That is the idea here: something steady you can steer by while you get your software where it needs to go.
Contact
Have a project, a prototype that needs finishing, or a question you want a straight answer to? Send me a note.