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A comprehensive system design guide for building infinite scroll feeds like LinkedIn and Twitter. Covers the core techniques: virtualized rendering (TanStack Virtual, react-window) to keep DOM nodes minimal, Intersection Observer API for efficient scroll detection, cursor-based pagination to avoid duplicate/missing posts in real-time feeds, skeleton loading screens to reduce perceived wait time, and memory management strategies including image URL cleanup and React Query's maxPages. Also addresses edge cases like variable-height items, new post injection, scroll restoration, and when infinite scroll is the wrong choice entirely.

How to Design an Infinite Scroll Feed | System Design Guide 2026

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Learn how to architect an infinite scroll feed like LinkedIn, Twitter, and Instagram from scratch. This guide covers virtualized lists, Intersection Observer API, cursor-based pagination, skeleton loading, memory management....

<p>Learn how to architect an infinite scroll feed like LinkedIn, Twitter, and Instagram from scratch. This guide covers virtualized lists, Intersection Observer API, cursor-based pagination, skeleton loading, memory management....</p>