Hi, I’m Jeff!


$2000 in the pot. I’m all in. I’m going to win.

I had pocket AA, the best possible hand you could have at a poker table. 4 people pushing all in. Suckers. They flip their cards, four cards get put on the board. Mathematically, I had a 95% probability of winning. Next card flips, 10. I lose.

I loved the math. Didn’t like losing money. I loved the statistics. The next logical step? Data science.

Fast forward 3 years and I’m a Data Scientist at DoorDash.

Who is Jeff Li?

I’m a Data Scientist on the Machine Learning Team at DoorDash. My work includes improvements on our recommendations algorithm. How do we show you restaurants you’ll actually like?

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Additional work includes building custom recommendations, attribution modeling & retention modeling. Previously wrote R & Python courses for thousands of students @ dataquest.io:

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I’m also obsessed with ultralearning. In 2018, I challenged myself to master 12 skills in 12 months. A few highlights include building an AI that automated Tinder:


I also became conversational in Spanish in one month (although I haven’t been practicing):


In my free time, you can find me freestyle rapping about a random topic, going on 50 mile bike rides or ballin’ up on the basketball courts. I’m fortunate to live a life that affords me to travel, having visited over 25+ countries, my favorite being Colombia.

Best Articles

To help you find something that interests you, I’ve curated my best content:

How I Automated Tinder Using Artificial Intelligence

Month 2 Master: Mastering 12 Skills in 12 Months

3 Strategies to Guarantee a Data Science Job with No Experience

Favorite Books/Podcasts/Articles

This is the 1% of content that have made 90% of the impact on my life:

6 Harsh Truths That Will Make You A Better Person: I read this when I was 21, stressed that I couldn’t find a job. This article forced me to swallow a harsh pill of life: The world doesn’t actually care about me. They care about what I can do for them. Don’t get a job. Become the man companies want to hire. Don’t get a girlfriend. Become the man girls want to date. The only path is self-improvement.

Randy Pausch’s Last Lecture: Randy Pausch was a computer science professor at Carnegie Mellon. He was diagnosed with terminal cancer. But before he passed, he gave a “last lecture” on achieving your childhood dreams. When death is so visceral, this forces you to make every minute of your life count:


Can’t Hurt Me by David Goggins - David Goggins completed three Navy Seal hell weeks, ran 100 miles in 24 hours, broke the world record for pull-ups (4000+ in 24 hours). Reading his story made me realize that we’re all severely underestimating our potential. That we’re capable of so much more.

Elon Musk: : Tesla, SpaceX, and the Quest for a Fantastic Future - This book helped me realize that I shouldn’t focus on just making money, working a job. To decide on the direction of my career, I should start by thinking about the most important problems in the world today. And then find careers that help solve these problems.