I’m a Senior Full Stack Engineer with 7+ years of experience building high-impact consumer and platform products at Uber and Amazon Web Services (AWS). My focus is on scalable front-end architecture, data-driven user experiences, and cloud-native backends that power real business outcomes.

I specialize in React, TypeScript, GraphQL, Node.js, and Go, with deep experience designing systems that balance performance, reliability, and developer velocity. Whether it’s modernizing legacy frontends, building experimentation platforms, or optimizing analytics pipelines, I love turning complex problems into elegant, measurable solutions.

🔹 At Uber, I led the end-to-end modernization of the product experimentation platform—scaling from 200 → 1,000+ concurrent tests and cutting analysis cycle time by 45%.

🔹 Built real-time analytics dashboards (React + D3.js) used by PMs and Data Scientists, improving data-driven decisions 3× faster.

🔹 Created a centralized metric system (Node.js + Go + Redis) reducing duplicate metrics by 60% across orgs.

🔹 At AWS, I delivered Amplify Studio, a Figma-to-React UI builder integrated with AppSync, reducing frontend build time by 60%.

I thrive at the intersection of UX and systems design—bridging designers, product managers, and backend engineers to ship delightful, performant experiences. I’m also passionate about AI-assisted tooling and design systems that empower teams to move faster without compromising quality.

Let’s collaborate to build products that scale beautifully and perform flawlessly. Whether you need to refactor a complex frontend, launch a data-rich dashboard, or architect a scalable web platform, I can help you ship with confidence and speed

Justin Liu

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