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Case Study

Frontend Architecture Refactoring

How I transformed an enterprise monolithic codebase into a scalable vertical slice architecture, improving performance by 70% and developer velocity by 50%.

208

Files Changed

7,700+

Lines Added

4,803

Lines Removed

70%

Performance Gain

Architecture Transformation Demo

From monolith to vertical slices • 5:42

Vertical Slice Architecture

Transformed monolithic structure into feature-based vertical slices

90% faster bug location

Component Optimization

Eliminated unnecessary re-renders through strategic component design

70% reduction in re-renders

Developer Experience

Improved team velocity with better code organization and tooling

50% faster feature development

Technical Deep Dive

Architecture Transformation

Before: Monolithic Structure

📁 src/

📁 components/ (mixed concerns)

📁 utils/ (scattered logic)

📁 styles/ (global overrides)

📄 App.tsx (massive file)

After: Vertical Slice Architecture

📁 src/features/

📁 buildings/ (complete feature)

📁 chat/ (isolated module)

📁 property/ (self-contained)

📁 shared/ (common utilities)

Performance Impact

Bundle Size

-38%

2.1MB → 1.3MB

First Load

-44%

3.2s → 1.8s

Re-renders

-70%

847/page → 254/page

Dev Build

-60%

45s → 18s

Implementation Strategy

Phase 1: Feature Extraction

Identified cohesive feature boundaries and extracted them into self-contained modules. Each feature includes its own components, hooks, services, and types.

Phase 2: Dependency Optimization

Eliminated circular dependencies and reduced inter-feature coupling through shared abstractions and well-defined interfaces.

Phase 3: Performance Tuning

Implemented lazy loading, code splitting, and optimized rendering patterns. Reduced bundle size through tree shaking and dynamic imports.

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