Changelog
Follow the evolution of my portfolio and projects. Every update, feature, and improvement documented.
4.0.0
Breaking ChangesComplete portfolio redesign with Next.js 14 and modern web technologies
Next.js 15 Migration
Complete transition from Gatsby to Next.js 15 with App Router and React Server Components.
Internationalization
Full i18n support for 6 languages (English, French, Spanish, German, Italian, Arabic) with RTL layout support.
Payload CMS Integration
Headless CMS implementation for dynamic content management with MongoDB backend.
Dark Mode
System-aware dark mode with manual toggle and persistent preferences.
Advanced Search
Full-text search with URL-based state management and category filtering.
Changelog System
Markdown-based changelog with version tracking and category grouping.
Server Components
Reduced client-side JavaScript by 60% through Server Components architecture.
Performance
Achieved 100/100 Lighthouse scores with optimized fonts, images, and critical CSS.
SEO Enhancement
Comprehensive structured data (JSON-LD) for Person, Organization, and Article schemas.
Type Safety
Full TypeScript coverage with strict mode enabled across the entire codebase.
Modern Styling
Migrated to Tailwind CSS 3.4 with custom design system using CSS variables.
Accessibility
WCAG 2.1 AA compliance with proper keyboard navigation and screen reader support.
Framework Change
Complete migration from Gatsby to Next.js 15 ecosystem.
API Routes
Restructured from `/api/*` to `/app/api/*` following Next.js 15 conventions.
Component Architecture
Migrated all components to Server Component patterns.
Dynamic Imports
Replaced `next/dynamic` with React Suspense boundaries.
Environment Variables
New naming convention for better security and clarity.
Content Security Policy
Strict CSP headers preventing XSS attacks.
Rate Limiting
API protection with 100 requests/minute limit.
Input Sanitization
DOMPurify integration for all user inputs.
Dependency Security
All packages updated to latest secure versions.
First Contentful Paint
Reduced from 2.1s to 0.6s (71% improvement).
Time to Interactive
Improved from 3.8s to 1.2s (68% faster).
Bundle Size
JavaScript bundle decreased from 380KB to 152KB (60% smaller).
Image Optimization
Next-gen formats (WebP/AVIF) with automatic fallbacks, 45% reduction in image payload.
Edge Caching
Deployed on Vercel Edge Network with 99.9% cache hit ratio.
Vercel Deployment
Optimized for Vercel platform with edge functions.
Database
MongoDB Atlas for CMS data with automatic backups.
Monitoring
Integrated analytics and error tracking.
CI/CD
Automated testing and deployment pipeline.
3.0.0
Breaking ChangesMajor redesign as Tech Lead portfolio with Gatsby framework
Tech Lead Positioning
Complete rebrand from "Développeur Web" to "Tech Lead | Mobile & Web Developer" reflecting career progression.
Gatsby Framework Migration
Rebuilt entire site using Gatsby.js for improved performance and developer experience.
Client Showcase
Added prominent client logos section featuring major brands worked with.
Enhanced Portfolio
Detailed case studies for major projects including Eurosport, Meetic Affiny, PandaLab, Fleetback, Qwant, and Medical Messenger.
Blog Integration
Added blog section for sharing technical insights and freelance experiences.
Three-Pillar Structure
Organized expertise into Web Applications, Software Architecture, and Mobile Applications.
Progressive Web App
Implemented PWA features with offline support and app-like experience.
Modern Tech Stack
Migration to React-based Gatsby framework with GraphQL data layer.
Performance Boost
Static site generation achieving sub-second load times.
Image Optimization
Automatic image optimization with lazy loading and WebP format support.
SEO Enhancement
Improved meta tags, structured data, and sitemap generation.
Professional Copy
Refined content emphasizing 10+ years of experience with major European companies.
Version Tracking
Introduced semantic versioning display in footer (v0.7.4).
Complete Redesign
Entirely new visual design and information architecture.
URL Structure
Changed from French to mixed French/English URL paths.
Content Reorganization
Complete restructuring of all content sections.
Technology Stack
Migrated from traditional HTML/CSS/JS to React/Gatsby ecosystem.
Lighthouse Score
Achieved 95+ scores across all Lighthouse metrics.
Code Splitting
Automatic route-based code splitting for optimal bundle sizes.
Service Worker
Offline-first strategy with intelligent caching.
CDN Deployment
Deployed to global CDN for reduced latency worldwide.
Company Branding
Added KARST DEVELOPMENT SARL company information.
Geographic Expansion
Positioned for Paris, Nancy, and France-wide market.
Service Refinement
Clear focus on enterprise and startup collaboration.
2.0.0
Breaking ChangesComplete redesign with enhanced navigation and service-oriented structure
Multi-Page Architecture
Migrated from single-page to multi-page structure with dedicated sections for Profile, Services, and Contact.
Enhanced Navigation
Implemented sticky navigation bar with clear menu structure (ACCUEIL, PROFILE, SERVICES, CONTACT).
Service Workflow Presentation
Added 5-step methodology showcase (Rencontre, Planning, Création, Test, Livraison).
Project Gallery
Visual portfolio section displaying client work with thumbnail previews.
Call-to-Action Sections
Strategic placement of contact prompts throughout the site.
Visual Hierarchy
Redesigned layout with improved content organization and readability.
Professional Branding
Updated logo and brand identity with "JULIEN KARST" prominently displayed.
Content Strategy
Expanded service descriptions focusing on iOS development, web applications, and SEO services.
Loading States
Added loading indicators for improved user experience during content fetch.
Mobile Menu
Resolved navigation menu collapse issues on mobile devices.
Form Submission
Fixed contact form submission handling and success message display.
URL Structure Change
Complete restructuring of URLs from hash-based to path-based routing.
Content Migration
All content reorganized into new section-based architecture.
Asset Optimization
Implemented lazy loading for images and deferred JavaScript loading.
CSS Architecture
Modular CSS structure for better maintainability and reduced file size.