Qwen’s Lead Engineer Quit 15 Days After Launch — The Untold Story Behind Qwen3.5
— title: “Qwen’s Lead Engineer Quit 15 Days After Launch — The Untold Story Behind Qwen3.5” Category: 41 — Focus Keyword: Qwen3.5 lead engineer resignation 2026 Target Audience: AI industry watchers, investors, and developers following open-source AI developments Monetization Path: Technical analysis + investment implications + developer tool coverage — Table of Contents [The Surprise Departure](#the-surprise-departure) [What Qwen3.5 Actually Delivered](#what-qwen35-actually-delivered) [The Internal Turmoil Behind the Headlines](#the-internal-turmoil-behind-the-headlines) [Market Reaction: 5.3% Stock Drop](#market-reaction-53-stock-drop) [What This Means for the Open-Source AI Race](#what-this-means-for-the-open-source-ai-race) [Alibaba’s AI Strategy Under Pressure](#alibabas-ai-strategy-under-pressure) [Who’s Poised to Fill the Gap](#whos-poised-to-fill-the-gap) — The Surprise Departure March 3, 2026. Fifteen days after