I’m Kelvin Jiang. I spent nearly a decade building recommendation systems at Netflix, then worked on ads at Pinterest; I started my career at Amazon. Now I’m building independently and writing here about what I make and what I learn along the way.

• Stoicism in the Time of Coronavirus
• Intuitive Iterators For Binary Trees
• A Descent Into JSON Parsing
• Intuitive Iterative Binary Tree Traversals
• Wrath of the Amazon Mechanical Turks
• A Risk-Oriented View of Asset Classes
• Micro-Geographic Arbitrage with 529 Plans
• Null is a Global Variable
• Maximize Your Homeowner Tax Deductions
• Oft-Misheard Phrases in the Workplace
• The Simple Portfolio
• The Best Asset Allocation Formula in the World
• Sell Your Home for Fun and Profit
• Sequencing Stock Sales
• The Case for Tax Efficient Municipal Bonds
• The Math Behind the Jury Selection Problem
• Wheel of Fortune Mystery Wedge Problem
• California Drought Dashboard
• Yelp is to Netflix as Foursquare is to Netflix
• Winning Bar Bets With Mathematics
• Time Asymmetry and the Department of Motor Vehicles
• The Nate Dogg Number
• Data Mining the NBA - Players Most Similar to Michael Jordan
• The Best Marketing Strategy That You Don't Know About
• Refrigerator Madness
• It's A Small World
• An Open Letter Regarding Innovation
• What Rejection Means For You
• Hacking the Padlock
• Doublets (Word Ladder) - A Word Puzzle Game
• Currency Arbitrage In 99 Lines of Ruby
• User Bin Crash
• Dance Battle
• The Lego Minifigure Collector's Problem
• Gattaca
• Liar, Liar
• Founder Patterns