Module 05

UI/UX Engineering & Accessibility

Bridging the gap between pixels and code. We explore how engineering decisions impact usability, why accessibility is a fundamental human right, and how to implement design systems at scale.

01.

UI vs. UX: The Engineer's View

While UI (User Interface) is what the user sees, UX (User Experience) is what the user feels. As engineers, we control the "feel" through implementation details that designers cannot mock up in Figma.

Design (Intent)

Colors, Typography, Spacing, Static Layouts. Focuses on visual hierarchy and brand identity.

Engineering (Reality)

Loading states, Error handling, Hover latency, Layout shifts. Focuses on interaction cost and system feedback.

02.

The Engineer's Role in UX

You are the final gatekeeper of the user experience. A beautiful design implemented poorly is a bad user experience.

Key Engineering UX Responsibilities:

  • Perceived Performance: Using skeletons and optimistic UI updates to make the app feel instant, even when the network is slow.
  • Layout Stability: Preventing content from jumping around as images load (CLS).
  • Input Latency: Ensuring typing and clicking feels responsive (under 100ms).
03.

Accessibility (A11y) Basics

Accessibility is not an "edge case"; it is the baseline. The web was designed to be accessible by default; bad code breaks it.

Semantic HTML: Use <button> for actions and <a> for navigation. Divs are invisible to screen readers.
Focus Management: Ensure users can navigate via Tab key. Never set outline: none without a replacement style.
Color Contrast: Text must have sufficient contrast against the background (WCAG AA standard).

"Inclusive Design" means building a product that works for everyone, regardless of their hardware, location, or ability.

04.

Real-World UI Engineering

Product companies solve UI consistency through Design Systems. As an engineer, you won't write hex codes like #8b5cf6; you will use Design Tokens like color.primary.500.

This abstraction allows companies to change their entire brand identity by updating a single configuration file, rather than refactoring thousands of components.

05.

Reference Material

Standardize your knowledge with these resources: