A Token-Driven Component Library to Reduce Handoff Friction and Ship Faster

The Challenge

Our app, built by an external team, worked but lacked consistency, accessibility, and a design system. We needed a reusable foundation.

Goals

Our goal was to create a modular component library that ensures consistency, accelerates development, and makes design-to-code handoffs predictable and accessible.

Build modular Flutter component library.

Write clear docs that helps developers.

Create matching Figma UIKit.

Constraints

We had just three weeks and a tiny team. I owned the design system and all design work, partnered with one developer and one QA. To hit the deadline we stayed ruthless about scope and built only the most critical components first.

Foundations

We began with tokens. By defining our building blocks first, we made sure everything else could scale consistently.

Typography

Adopted Inter with variable weights and tabular numbers for prices and timers.

Color

Established brand colors and semantic palettes with proper contrast.

Spacing

Set up a 4-point grid for rhythm and clarity.

Elevation

Aligned shadow levels with iOS and Android standards.

Components

With limited time, we had to be strategic. Together with engineering, we identified the most used and easiest to build in Flutter.

Documentation

Our documentation wasn’t just about listing props. Each component doc covered:

  • Anatomy and specs (sizes, spacing, typography, icons).
  • States and behaviors (disabled, loading, validation).
  • Accessibility guidelines (touch targets, contrast, focus order).
  • Token map (exact tokens used).
  • Flutter API details.
  • Do’s and Don’ts with examples.

Example Documentation for buttons

Build–QA Loop

We set up a fast loop: design → build → verify → adjust. Engineers created two test environments so we could check components against specs quickly, make tweaks, and re-verify.

Deliverables

In three weeks, we shipped:

  • 07 modular, tokenized Flutter components.
  • Full design tokens for typography, color, spacing, and elevation.
  • Documentation with anatomy, usage, and API details.
  • A Figma UI Kit perfectly aligned with code.

Impact

This component library became our single source of truth for visuals and interactions. Handoffs became faster, developers reused stable components, and accessibility improved across the app.

Using BoostUI feels straightforward. I grab a component, set a couple of props, and it just works the way the designs show.

Nisal Silva

Tech Lead

The consistency is a relief. Once we aligned on tokens, every screen started looking and behaving the same without extra tweaks.

Rajitha Srimal

Senior Software Engineer

The docs and examples save time. I can see the anatomy, states, and code snippet in one place and ship faster.

Kushani Perera

Software Engineer

Summery

BoostUI turned a fragmented app into a token-driven design system. In just three weeks, our small team delivered a foundation that improved speed, consistency, and accessibility, and set the stage for scalable growth.