Frontend Development

Expertise in building responsive, accessible, performant web interfaces

Frontend Frameworks

React

  • Proficiency: Advanced
  • Key Skills:
    • Component architecture
    • Hooks (useState, useEffect, useContext)
    • State management
    • Virtual DOM optimization
    • Conditional rendering
    • Form handling
  • Projects: How About You frontend
  • Ecosystem: React Router, Redux (or Context API), testing libraries

Vue.js

  • Proficiency: Intermediate-Advanced
  • Key Skills:
    • Component-based architecture
    • Reactive data binding
    • Vue Router for navigation
    • Composition API
    • Template syntax
    • Props and events
  • Projects: Ziegel.me (SPA with retro design)
  • Strengths: Progressive framework, gentle learning curve, excellent documentation
  • Build Tools: Webpack, Vite, rollup

HTML & CSS

Semantic HTML

  • Proper document structure
  • Accessibility semantics
  • SEO-friendly markup
  • Form structure and validation
  • Meta tags and headers

CSS & Styling

  • Responsive Design: Mobile-first, media queries
  • Layout Techniques: Flexbox, CSS Grid, positioning
  • CSS Modules: Scoped styling
  • Preprocessors: SASS/SCSS for maintainable styles
  • CSS-in-JS: Styled components, emotion
  • Design Systems: Component-based CSS architecture

Performance & Optimization

  • Image optimization and lazy loading
  • Critical CSS
  • Font loading optimization
  • Animation performance
  • CSS bundle optimization

JavaScript / TypeScript

Core JavaScript

  • ES6+ features
  • Async/await and Promises
  • Functional programming patterns
  • DOM manipulation
  • Event handling
  • Object-oriented programming

TypeScript

  • Type system and interfaces
  • Generics
  • Decorators
  • Type safety benefits
  • Integration with modern frameworks

Build Tools

  • Webpack: Module bundling and configuration
  • Vite: Fast development builds
  • Babel: Transpilation for compatibility
  • ESLint: Code quality and consistency
  • Prettier: Code formatting

Responsive Design

Mobile-First Approach

  • Mobile viewport optimization
  • Touch interactions
  • Responsive images
  • Adaptive layouts
  • Performance for limited devices

Breakpoints & Adaptation

  • Media query strategies
  • Responsive images (srcset, picture)
  • Mobile navigation patterns
  • Touch-friendly UI elements

Accessibility (a11y)

Standards & Compliance

  • WCAG 2.1 Level AA
  • Semantic HTML for accessibility
  • ARIA labels and roles
  • Color contrast requirements
  • Font sizing and readability

Implementation

  • Keyboard navigation support
  • Screen reader compatibility
  • Focus management
  • Error message clarity
  • Form accessibility

Testing

  • Automated accessibility testing
  • Manual testing with screen readers
  • Keyboard-only navigation testing
  • Color contrast validation

Performance Optimization

Metrics & Monitoring

  • Core Web Vitals (LCP, FID, CLS)
  • Lighthouse scores
  • Bundle analysis
  • Performance profiling
  • Real user monitoring

Optimization Techniques

  • Code splitting and lazy loading
  • Image optimization
  • Minification and compression
  • Caching strategies
  • Critical rendering path
  • Tree shaking

Static Site Generators

Hugo

  • Proficiency: Advanced
  • Key Skills:
    • Theme development
    • Template syntax
    • Content organization
    • Build optimization
    • Static site generation
  • Projects: Ziegel Blog, Fenja-Frings.de
  • Advantages: Speed, simplicity, no dependencies

JAMstack Architecture

  • Static HTML/CSS/JS delivery
  • API-driven content
  • Pre-rendering
  • CDN distribution
  • Security benefits
  • Performance advantages

Browser APIs & Modern Web

Web APIs

  • Fetch API and HTTP requests
  • LocalStorage and SessionStorage
  • Service Workers
  • Web Audio API
  • Geolocation
  • Canvas and WebGL

Animations & Effects

  • CSS animations and transitions
  • JavaScript animation libraries
  • Keyframe animations
  • Performance-conscious effects
  • Smooth interactions

Design Patterns & Architecture

Component Patterns

  • Presentational vs. Container components
  • Compound components
  • Render props
  • Custom hooks
  • Higher-order components

State Management

  • Redux (if applicable)
  • Context API
  • Zustand or similar
  • Local vs. global state
  • State normalization

Testing

Frontend Testing

  • Unit testing (Jest, Vitest)
  • Component testing (React Testing Library)
  • Integration testing
  • E2E testing (Cypress, Playwright)
  • Visual regression testing

Browser Compatibility

Cross-Browser Support

  • Progressive enhancement
  • Polyfills
  • Feature detection
  • Browser compatibility testing
  • Graceful degradation

Web Development Tools

  • Browser DevTools
  • Chrome DevTools
  • Firefox Developer Tools
  • VS Code extensions
  • Git and version control
  • Package managers (npm, yarn)

Code Quality

Standards

  • Airbnb/Google JavaScript style guides
  • Consistent formatting with Prettier
  • ESLint rules and configuration
  • Code review practices

Best Practices

  • DRY principle
  • KISS principle
  • Meaningful variable names
  • Comments and documentation
  • Refactoring awareness