Hey - I’m Casey Juanxi Li.

I write at onceperday.substack.com. I try to do this once a day, more or less.

I am a software engineer with a machine learning background. I’ve also done some data science, product management, and startup stuff. I write and I self-teach psychology and theology.

The above are all means to an end: I like understanding problems, and building useful tools to solve them.


  • Career: LinkedIn (Wharton / MSc Comp Sci, University of Toronto / Addepar / McKinsey)

  • Code: GitHub (Python / JavaScript / React)

  • I wrote a newsletter about tech, VC, and startup hubris at But First, Entrepreneurs. It’s based loosely on my experience at EF. I’ve been told it’s a little edgy 👀 but entertaining, and serious at times.

  • Beliefs:

    • I like software as a medium because it has so few gatekeepers.
    • I like open, permissionless markets that directly connect consumers and producers, while maintaining an open record for reputation. I think this is the best way to encourage meritocracy and reduce nonsense.
    • It’s hard to construct such markets, so we rely on relationships instead to provide trust and information.

I am Canadian and currently live in Toronto. I’m in London (UK) quite alot too.

Get in touch: