How to Build a Scalable, Composable Design System in Figma
This article explains why the old component library became a bottleneck, outlines the creation of a new Figma‑based design system using composable components, variants, and instance swaps, and demonstrates how modular sub‑components, clear APIs, and open layouts improve flexibility, maintainability, and product delivery speed.
As our product iterated, the two‑year‑old component library showed limited flexibility and growing size due to patch‑based fixes, hindering innovation.
We decided to rebuild a design system from scratch in Figma, focusing on reusability, extensibility, and freedom, with clearly defined component responsibilities.
The “Composable Components” concept splits complex UI into smaller, reusable parts that can be assembled into higher‑level components, reducing complexity and improving maintainability.
Implementation in Figma uses Variants and Component Properties to enable two approaches: nested components and slot‑based (swap) components, making the composable idea feasible in UI design.
A high‑quality design system boosts delivery efficiency, ensures visual and interaction consistency, and avoids the pitfalls of monolithic components that become unmaintainable as products evolve.
We advocate breaking large components into independent sub‑components, defining clear APIs for each, and using Instance Swap and Nested Instances to extend properties without inflating the component count.
Examples such as NavBar, Dialog, and Badge illustrate how sub‑components, variants, and swaps enable flexible composition, version control, and rapid adaptation to new requirements.
Component naming distinguishes core, business, and action sub‑components, helping designers and developers understand responsibilities and maintain a modular system.
Open layouts, combined with Figma’s Variables, provide designers with freedom while preserving standards, allowing “building‑block” design that scales with future tool updates.
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Yuewen Experience Design (YUX)
Yuewen Group's UX Design Department – an internet design team for the cultural‑creative industry, welcoming new members.
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