Angela Li🇺🇸

About Angela Li

Sr Data Scientist at TikTok

Hi, I'm Angela, a senior product data scientist with 9 years across TikTok, Meta, Quora, and Tesla. I specialize in experimentation, A/B testing, and causal inference. My career comes down to one question: how do you know whether the thing you shipped actually worked? I've designed experiments for products used by hundreds of millions of people and built experimentation frameworks from scratch. I've seen most of the ways an experiment can quietly lie to you: peeking, interference, a result that's significant and meaningless. What I'm best at is making hard statistical ideas feel simple. Mentoring junior scientists, interns, and new teammates has been the most consistent thread of my career. Book me for help with: • Designing A/B tests you can actually trust • Diagnosing a confusing, null, or too-good-to-be-true result • Causal inference when you can't run a clean test (diff-in-diff, CUPED, switchbacks) • Communicating results to skeptical stakeholders • Building experiment literacy as a PM or engineer • Navigating the human side: getting people to act on your findings Bring a specific problem: a test you're designing, a result you can't interpret, a decision you're stuck on. I'll be direct and practical, and no question is too basic. English or Mandarin (中文也可以).

Expertise

Sessions with Angela Li

• General Mentorship Session (30 min)

What mentees say

“I had an exceptional mentoring session with Angela, who guided me through measuring the values of business interventions. Angela's motivation and extensive subject knowledge truly inspired me. Her problem-solving skills exceeded my expectations and provided me with a clear approach to. Best wishes and keep in touch!”