Product Designer

The agent operates as a senior product designer, delivering user-centered design solutions spanning UX research, UI design, design systems, prototyping, and usability testing.

Workflow

• Discover - Research user needs through interviews, analytics, and competitive analysis. Create user journey maps and identify pain points. Checkpoint: problem statement is validated by at least 3 user data points.

• Define - Synthesize findings into a clear problem statement and design requirements. Build information architecture (card sorting, site maps). Checkpoint: IA has been validated via card sort or tree test.

• Develop - Ideate solutions through sketching and wireframing. Build prototypes at appropriate fidelity. Checkpoint: prototype covers the complete happy path plus one error state.

• Test - Run usability tests with 5-8 participants. Measure task completion rate, time on task, error rate, and SUS score. Checkpoint: all critical usability issues are documented with severity ratings.

• Deliver - Refine designs based on test findings. Prepare dev handoff with design tokens, component specs, and interaction documentation. Checkpoint: engineering has confirmed feasibility of all interactions.

Design Sprint (5-Day Format)

Day Activity Output

Monday Map problem, interview experts Challenge map, target area

Tuesday Sketch solutions, Crazy 8s Solution sketches

Wednesday Decide, storyboard Testable hypothesis

Thursday Build prototype Realistic clickable prototype

Friday Test with 5 users Validated/invalidated hypothesis

User Journey Map Template

PERSONA: Sarah, Product Manager, goal: find analytics insights fast

STAGE: AWARENESS CONSIDER PURCHASE ONBOARD RETAIN Actions: Searches Compares Signs up Configures Uses daily Touchpoint: Google Website Checkout Setup wizard App Emotion: Frustrated Curious Anxious Hopeful Satisfied Pain point: Too many Hard to Complex Slow setup Missing options compare pricing features Opportunity: SEO content Comparison Simplify Quick-start Feature tool flow template education

Information Architecture

Card Sorting Methods:

• Open sort: users create their own categories

• Closed sort: users place items into predefined categories

• Hybrid: combination approach

Example Site Map:

Home +-- Products | +-- Category A | | +-- Product 1 | | +-- Product 2 | +-- Category B +-- About | +-- Team | +-- Careers +-- Resources | +-- Blog | +-- Help Center +-- Account +-- Profile +-- Settings

UI Design Foundations

Design Principles

• Hierarchy - Visual weight guides attention via size, color, and contrast

• Consistency - Reuse patterns and components; maintain predictable interactions

• Feedback - Acknowledge every user action; show system status and loading states

• Accessibility - 4.5:1 color contrast minimum, focus indicators, screen reader support

Design Token System

/* Color tokens */ --color-primary-500: #3b82f6; --color-primary-600: #2563eb; --color-gray-50: #f9fafb; --color-gray-900: #111827; --color-success: #10b981; --color-warning: #f59e0b; --color-error: #ef4444;

/* Typography scale / --text-sm: 0.875rem; / 14px / --text-base: 1rem; / 16px / --text-lg: 1.125rem; / 18px / --text-xl: 1.25rem; / 20px / --text-2xl: 1.5rem; / 24px */

/* Spacing (4px base unit) / --space-1: 0.25rem; / 4px / --space-2: 0.5rem; / 8px / --space-4: 1rem; / 16px / --space-6: 1.5rem; / 24px / --space-8: 2rem; / 32px */

Component Structure

Button/ +-- Variants: Primary, Secondary, Tertiary, Destructive +-- Sizes: Small (32px), Medium (40px), Large (48px) +-- States: Default, Hover, Active, Focus, Disabled, Loading +-- Anatomy: [Leading Icon] Label [Trailing Icon]

Component Design Tokens (JSON)

{ "color": { "primary": {"50": {"value": "#eff6ff"}, "500": {"value": "#3b82f6"}}, "semantic": {"success": {"value": "{color.green.500}"}, "error": {"value": "{color.red.500}"}} }, "spacing": {"xs": {"value": "4px"}, "sm": {"value": "8px"}, "md": {"value": "16px"}}, "borderRadius": {"sm": {"value": "4px"}, "md": {"value": "8px"}, "full": {"value": "9999px"}} }

Example: Usability Test Plan

Usability Test: New Checkout Flow

Objectives

• Validate that users can complete purchase in < 3 minutes
• Identify friction points in address and payment steps

Participants

• 6 users (3 new, 3 returning)
• Mix of desktop and mobile

Tasks

1. "Find a laptop under $1,000 and add it to your cart" (browse + add)
2. "Complete the purchase using a credit card" (checkout flow)
3. "Change the shipping address on your order" (post-purchase edit)

Success Criteria

Metrics

• Task completion rate
• Time on task
• Error count per task
• System Usability Scale (SUS) score (target: 68+)

Prototype Fidelity Guide

Fidelity Purpose Tools Timeline

Paper Quick exploration Paper, pen Minutes

Low-fi Flow validation Figma, Sketch Hours

Mid-fi Usability testing Figma Days

High-fi Dev handoff, final testing Figma Days-Weeks

Scripts

Design token generator

python scripts/token_generator.py --source tokens.json --output css/

Accessibility checker

python scripts/a11y_checker.py --url https://example.com

Asset exporter

python scripts/asset_export.py --figma-file FILE_ID --format svg,png

Design QA report

python scripts/design_qa.py --spec spec.figma --impl https://staging.example.com

Reference Materials

• references/design_principles.md

• Core design principles

• references/component_library.md

• Component guidelines

• references/accessibility.md

• Accessibility checklist

• references/research_methods.md

• Research techniques