coldbydefault-portfolio

ColdByDefault Portfolio · V4.11.18

Modern, secure, high‑performance developer portfolio built with Next.js 15.5.1, TypeScript, a strongly hardened edge-first architecture & multi‑locale SEO‑optimized delivery.

Live: https://www.coldbydefault.com • Docs: https://docs.coldbydefault.com/ • Stack: Next.js 15.5.1 · React 19.1.1 · TypeScript 5.x · Tailwind 4.1.12 · shadcn/ui · Embla Carousel · Framer Motion 12.x · next-intl 4.3.5 · Prisma ORM · Neon PostgreSQL · Zod · ESLint 9.x · Vercel

latest >= 4

Overview
Technology Stack
Key Features
Internationalization (i18n)
SEO & Discoverability
Performance & Accessibility
Architecture Overview
API Surface
Security & Hardening
GitHub Actions & Automation
Privacy & Data Handling
Development (Local Setup)
Quality & Tooling
Roadmap
License & Intellectual Property
Contact

1. Overview

This portfolio serves as a professional showcase of engineering capability: performant UI, secure API integrations (GitHub, PageSpeed), accessibility‑focused design, production‑grade hardening, and now multi‑language + deep structured SEO implementation achieving a 100/100 Google Lighthouse SEO score (Sep 2025 validation). All code is proprietary and published strictly for viewing.

2. Technology Stack

Core:

Next.js 15.5.1 (App Router, Server Components, Edge runtime where applicable)
React 19.1.1, TypeScript 5.x (strict mode)
Tailwind CSS 4.1.12 + PostCSS
shadcn/ui (accessible primitives)
Embla Carousel 8.6.0 (modern carousel with autoplay)
Framer Motion 12.23.12 (animation system)
next-intl 4.3.5 (runtime + server i18n)
Vercel Hosting & Edge Network
Vercel CRON Jobs (Automated Background Tasks & refresh Data)

Development & Quality:

ESLint 9.x (flat config system, TypeScript-ESLint 8.41.0 integration)
Strict type checking with zero any tolerance
Enhanced import/export linting and validation
Comprehensive type coverage for all API interfaces (AdminStats, GitHubData, PageSpeedMetrics)
Discriminated unions for locale handling and error states
TypeDoc for comprehensive documentation generation

Supporting & Utilities:

Custom hooks (device, language, theming)
CSP + HTTP security headers configuration
Lightweight internal rate limiting & request sanitation
Structured SEO config & JSON-LD generators
Zod schema validation for type-safe runtime validation
Prisma ORM for type-safe database operations
Neon PostgreSQL for scalable data storage
Dynamic browser language detection & auto-switching
Advanced middleware for locale routing & redirections
Dynamic sitemap & robots.txt generation

3. Key Features

User Experience & UI:

Responsive, mobile‑first adaptive layout
Theme switching (light/dark) with persistence
Enhanced carousel showcases with autoplay (Embla Carousel 8.6.0)
Animated hero, project & certification showcases
Cookie consent banner & localized content (EN / DE / ES / SV / FR)
Improved accessibility with ARIA support and keyboard navigation
Browser language auto-detection with intelligent locale switching
Advanced middleware for seamless locale routing
Enhanced general styling & visual improvements

Content & Data:

Dynamic project, technology, and certification data modules
Real‑time GitHub MCP repository & profile fetch (sanitized & cached)
Google PageSpeed Insights integration for performance transparency
Enhanced type-safe API interfaces for all data endpoints
Blog system with dynamic content management and filtering
CRUD admin dashboard for comprehensive blog management
Interactive chatbot system for visitor engagement
Enhanced blog styling with error handling & fallbacks
New dedicated pages: /media & /library for content showcase
Dynamic sitemap & robots.txt generation for improved SEO
Prisma ORM integration for efficient database operations

Engineering & Quality:

Modular component architecture (segmented domains: hero, github, projects, tech, seo, ui primitives)
ESLint 9.x flat config with strict TypeScript integration
Enhanced type safety and performance optimizations
Zero-tolerance policy for any types across the codebase
Centralized & locale‑aware SEO handling (SEOHead, dynamic OG tags, canonical + hreflang)
Schema.org structured data generation (Person, Breadcrumbs)
100/100 Lighthouse SEO score target (validated Sep 2025)
No hydration warnings / zero console errors goal
Comprehensive TypeScript coverage (SEO config types, i18n message surfaces, rate limiting utilities)

Security & Privacy (summary):

Hardened headers, CSP, origin isolation mindset
Input & error sanitization on API boundaries
Zero hard‑coded credentials; environment isolation
Rate limiting to mitigate abuse vectors
Reinforced type safety to narrow attack surface (literal unions for locales & metadata)

4. Internationalization (i18n)

Runtime locale negotiation with graceful fallbacks:

Framework: next-intl (server aware, streaming compatible)
Supported locales: en, de, es, sv, fr
Browser Language Detection: Automatic detection & intelligent switching
Advanced Middleware: Seamless locale routing with proper redirections
Selection Order: Browser preference → Default en
Message Bundles: JSON under messages/ (typed access enhancements on roadmap)

5. SEO & Discoverability

Advanced multi‑locale SEO system delivering consistent structured metadata:

Config‑driven locale specific SEO objects
Open Graph & Twitter card variants per locale (images, titles, descriptions)
JSON-LD generation for Person + BreadcrumbList
Canonical + alternate hreflang tags
Keyword curation & skill taxonomy powering knowsAbout
Dynamic sitemap.xml generation with automatic locale & page discovery
Dynamic robots.txt with proper crawling directives
Enhanced SEO improvements across all pages & components
CSP‑compatible (no unsafe inline script proliferation)
Verified 100/100 Lighthouse SEO score (Sep 2025) & 100 PageSpeed Insights SEO metric

6. Performance & Accessibility

Focus Areas:

First Meaningful Paint minimization via streaming & selective client components
Efficient image delivery (static assets + modern formats where suitable)
Reduced JavaScript footprint (edge/server rendering bias)
Accessible semantic structure (landmarks, labels, focus states)

7. Architecture Overview

High‑level structure:

app/ — Next.js routing (App Router, layouts, localized paths)
components/ — Domain + UI abstraction layers (hero, github, ui primitives, accessibility focus)
data/ — Structured static metadata (projects, certifications, tech)
lib/ — Cross‑cutting utilities (security, SEO, rate limiting / monitoring)
hooks/ — Custom React hooks (language, mobile detection, client gating)
public/ — Static assets (images, logos, sitemap, robots)

Design Principles:

Separation of concerns (data vs presentation)
Minimal surface area for API routes
Immutable, typed content modules

8. API Surface

Comprehensive API endpoints with security-first design:

Endpoint	Purpose	Notes
`/api/about`	Returns profile / about metadata	Static + typed
`/api/blog`	Blog content management and retrieval	Prisma + Zod
`/api/github`	Fetches GitHub profile + repos (filtered)	Tokenized (env)
`/api/pagespeed`	Surfaces PageSpeed metrics	External API wrapper
`/api/chatbot`	Interactive AI chatbot (Reem) for visitor queries	AI-powered responses
`/api/admin`	Administrative operations for content	Secured endpoints

Controls:

Input validation & schema constraints with Zod
Standardized error envelopes (no internal leakage)
Rate limiting (per IP windowed)
Type-safe database operations via Prisma ORM
Enhanced security headers and CSP compliance

9. Security & Hardening

Last internal assessment: 2025‑09 (latest iteration) — no known unresolved critical/high issues.

Implemented Layers (expanded in 4.11.15):

Transport & Headers: HSTS, CSP, X-Content-Type-Options, X-Frame-Options (deny), Referrer-Policy, Permissions-Policy.
Application: Sanitized inputs, explicit error redaction, avoidance of eval / dangerous DOM sinks, reinforced type gates (locale / SEO literal unions) reducing unchecked paths.
Operational: Secrets confined to environment variables; repository free of credentials.
Abuse Mitigation: IP‑scoped rate limiting on sensitive endpoints with enhanced Zod validation.
Dependency Hygiene: Routine audit (npm audit) — zero known CVEs at last scan; periodic verification of transitive packages relevant to security headers & i18n.
Automated Security: CodeQL Advanced Security Scanning for JavaScript, TypeScript, and Python with multi-language matrix analysis.
Dependency Security: Automated dependency review workflows blocking vulnerable dependencies in pull requests.

Security Posture Snapshot:

Critical: 0
High: 0
Medium: 0
Low/Informational: Monitored
Automated Scanning: Active (CodeQL + Dependency Review)

10. GitHub Actions & Automation

Automated security and quality workflows ensuring code integrity and vulnerability management:

CodeQL Advanced Security Scanning:

Triggers: Push to main, pull requests, scheduled weekly
Languages: Actions, JavaScript/TypeScript, Python
Purpose: Static analysis for security vulnerabilities, code quality issues, and potential attack vectors
Advanced Features: Multi-language matrix analysis, configurable query packs, integration with GitHub Security tab

Dependency Review:

Triggers: Pull requests to main branch
Purpose: Scans dependency changes for known vulnerabilities and license compliance
Features: Blocks PRs with vulnerable dependencies, provides detailed security reports in PR comments
Integration: Automated comments on pull requests with dependency security analysis

Vercel CRON Jobs & Automation:

PageSpeed Data Refresh: Automated background refresh every 12 hours (0 */12 * * *)
Endpoint: /api/pagespeed/refresh with extended 5-minute execution timeout
Purpose: Keeps PageSpeed Insights data current without user-initiated requests
Caching Strategy: 12-hour cache with 24-hour stale-while-revalidate for optimal performance
Vercel Redirections: Advanced URL redirections & routing optimizations
Automated Background Tasks: Comprehensive automation for data freshness & performance
Integration: Seamless background updates maintaining data freshness for performance transparency

Documentation & Quality Automation:

TypeDoc Generation: Automated documentation generation covering components, app, types, hooks, data, and more
Live Documentation: Available at https://docs.coldbydefault.com/ with comprehensive API and component documentation
Command Integration: docs script for comprehensive TypeDoc documentation pipeline
Coverage: Expands across all major project directories with TypeScript configuration integration
Quality Gates: Enhanced ESLint flat config system with TypeScript-ESLint integration

11. Privacy & Data Handling

No invasive tracking; minimal analytical surface.
Cookie consent banner gating non‑essential storage.
No third‑party ad or profiling scripts.

12. Development (Local Setup)

Proprietary code; cloning allowed for personal viewing only (no reuse / redistribution).

Prerequisites: Node 20+ (LTS recommended), pnpm or npm.

Install & Run:

pnpm install
pnpm dev

Open http://localhost:3000

Build:

pnpm build
pnpm start

Quality Assurance:

# Run ESLint 9.x with flat config
pnpm lint

# Auto-fix linting issues
pnpm lint:fix

# Check for dependency updates
pnpm test-dep

# Generate comprehensive TypeDoc documentation
pnpm docs

Database Management:

# Generate Prisma client
pnpm db:generate

# Deploy migrations
pnpm db:migrate

# Push schema changes
pnpm db:push

# Seed database with initial data
pnpm db:seed

# Reset database with fresh seed
pnpm db:reset

Blog System & Content Management:

Prisma ORM provides type-safe database operations with PostgreSQL
Zod schema validation ensures runtime type safety for all API inputs
Neon PostgreSQL offers scalable, managed database infrastructure
Blog content is dynamically managed through secure admin APIs
Full CRUD operations with proper validation and error handling

13. Quality & Tooling

Development Workflow:

Complete migration to ESLint flat config system (eslint.config.mts)
TypeScript-ESLint with enhanced rule configuration
Custom rule configuration for UI components vs. application code
Enhanced import resolution and React hooks linting
Zero-tolerance policy for @typescript-eslint/no-explicit-any

Documentation & Type Safety:

TypeDoc for comprehensive documentation generation
Covers components, app, types, hooks, data, i18n, lib, and more
Automated documentation pipeline with docs script integration
Enhanced type coverage across all project domains
Zod runtime validation ensuring type safety at API boundaries

UI Component Architecture:

Carousel component system using Embla Carousel with autoplay
Improved component composition patterns with Radix UI primitives
Better separation of concerns (data vs presentation layers)
Enhanced accessibility focus states & ARIA coverage
Framer Motion integration for advanced animations

Development Experience:

Enhanced ESLint rules for consistent code patterns
Improved error boundaries and type-safe error handling
Better debugging capabilities with structured logging
Performance monitoring with enhanced PageSpeed integration
Prisma ORM with comprehensive database tooling
Advanced middleware system for locale routing and redirections

14. Roadmap

Completed Features:

✅ TypeDoc documentation system implementation
✅ Enhanced CodeQL security scanning across multiple languages
✅ Automated dependency review workflows
✅ Interactive chatbot system (Reem AI Assistant) integration
✅ Comprehensive admin dashboard with CRUD operations
✅ Enhanced Prisma ORM integration

Planned Enhancements:

Expand localization (additional languages beyond 5; automated missing key detection)
Further edge caching tuning & RUM instrumentation (privacy‑preserving)
Enhanced visual regression / accessibility automation
Add selective metrics dashboard (anonymized)
Structured data expansion (Projects, Certifications)
Advanced chatbot capabilities with memory and context awareness
Enhanced performance monitoring and optimization tools

15. License & Intellectual Property

This repository is provided exclusively for viewing professional capability.

Restrictions (Summary):

No copying, modification, redistribution, or derivative works.
No commercial or personal reuse of code, assets, or design patterns.
Use beyond viewing requires explicit prior written permission.

Refer to LICENSE & COPYRIGHT files for formal wording.

16. Contact

Portfolio: https://www.coldbydefault.com Documentation: https://docs.coldbydefault.com/ Email: contact@coldbydefault.com Linktree: https://linktr.ee/ColdByDefault
For professional or security inquiries, reach out via the official channels listed above.

Security research note: Responsible disclosure practices appreciated. Do not attempt exploitation against production infrastructure.