Full-Stack Engineer
Building production-ready SaaS platforms with modern web technologies

I don't just write code—I architect production-ready systems that scale. With hands-on experience building enterprise SaaS platforms from the ground up, I bring:

✅ Full-Stack Mastery — End-to-end ownership from database schema to polished UI
✅ Production Experience — Payment processing, authentication, webhooks, external API integrations
✅ Modern Architecture — Next.js 15, React Server Components, TypeScript, Prisma ORM
✅ Problem Solver — Quick learner who delivers clean, maintainable, well-documented solutions
✅ DevOps Knowledge — Docker, CI/CD, database migrations, deployment strategies
✅ Security-First — Authentication, authorization, rate limiting, input validation, CSRF protection

Production-ready SaaS platform for artist profile management and music submissions with full-stack ownership:

Technical Highlights:

• 🔐 NextAuth v5 authentication with role-based access control
• 💳 Stripe integration — Subscriptions, webhooks, customer portal
• 🎨 File upload infrastructure — Image processing, validation, automatic cleanup
• 🌍 Database architecture — PostgreSQL schema design with optimization
• 🔄 Spotify Web API integration — OAuth2 integration for artist discovery
• 📊 Admin dashboard — Complete CMS for content management
• 🎭 Artist workflows — Profile management and music submission systems
• 🚀 CI/CD pipelines — GitHub Actions with automated testing

Key Achievements:

• Designed complete system architecture (frontend / backend / database)
• Built artist authentication and role-based access control
• Implemented subscription billing with Stripe webhooks
• Created REST API and business logic from scratch
• Deployed with Docker containerization and monitoring
• Developed real-time artist profile management interface

Tech Stack: Next.js · TypeScript · Node.js · PostgreSQL · Docker · Stripe API · Spotify API · TailwindCSS · REST APIs

Links: Live Demo

LAN-based clipboard synchronization tool enabling seamless copy-paste across Windows, Android, and macOS:

Technical Highlights:

• 🌐 Peer-to-peer architecture — Zero-config, no cloud required
• 🔍 mDNS auto-discovery — Automatic device detection on local network
• 🚀 Fast sync latency — Bidirectional sync in 100-500ms
• 📱 Multi-platform support — Windows, Android (Jetpack Compose), macOS
• 🔒 Secure — TCP/UDP networking with local network only

Technical Implementation:

• Kotlin and Jetpack Compose for Android frontend
• mDNS (Bonjour) protocol for service discovery
• TCP/UDP networking protocols for data sync
• Multi-platform architecture design

Tech Stack: Kotlin · Jetpack Compose · Networking (TCP/UDP/mDNS) · Multi-platform Architecture

Links: GitHub Repository

Systems & Full-Stack Engineer specializing in design, development, and operations of modern web systems and infrastructure. Experienced in Linux server administration, Node.js/TypeScript backend services, PostgreSQL/MySQL database design, automation, and application deployment in Docker environments with CI/CD pipelines. Full stack expertise from database schema and API design through frontend applications in React/Next.js to application operations on Linux infrastructure.

• ⚡ Full-Stack Architecture & Development — End-to-end ownership from database to deployment
• 🏗️ Backend Services — Node.js, TypeScript, REST API design and implementation
• 📊 Database Design & Optimization — PostgreSQL, MySQL, schema design, query optimization
• 🎨 Frontend Development — React, Next.js, TypeScript, Tailwind CSS
• 🐳 DevOps & Infrastructure — Docker, Kubernetes, Linux administration, CI/CD pipelines
• 🔌 Third-Party Integration — Payment gateways (Stripe), OAuth (Spotify), webhooks, REST APIs
• 🔐 Security Engineering — Auth systems, RBAC, input validation, rate limiting
• 🚀 Performance Engineering — Server components, caching, query optimization
• 🧪 Testing & QA — Unit tests, integration tests, E2E testing strategies

const expertise = {
  backend: ["Node.js", "TypeScript", "REST APIs", "C# .NET Core", "Spring Boot"],
  frontend: ["React", "Next.js", "TypeScript", "TailwindCSS"],
  database: ["PostgreSQL", "MySQL", "Schema Design", "Query Optimization"],
  devops: ["Docker", "Kubernetes", "GitHub Actions", "CI/CD Pipelines", "Linux Administration"],
  languages: ["TypeScript", "JavaScript", "Kotlin", "Python", "Bash"],
  tools: ["Git", "Grafana", "Stripe API", "Spotify API", "AWS"],
}

• 🎯 Product Mindset — I understand business requirements and translate them into technical solutions
• 📚 Self-Documenting Code — Clear naming, TypeScript types, comprehensive documentation
• 🔄 Continuous Learning — Always adopting latest best practices and technologies
• 💬 Communication — Can explain complex technical concepts to non-technical stakeholders
• 🎵 Creative Background — As a music producer (Spotify | Apple Music), I bring creativity to problem-solving

What you get when you hire me:

1. Fast Onboarding — I quickly understand existing codebases and start contributing
2. Clean Commits — Well-structured Git history with meaningful commit messages
3. Production-Ready Code — Error handling, edge cases, security considerations
4. Thorough Documentation — README files, API docs, inline comments where needed
5. Collaboration — Experience with code reviews, pair programming, agile workflows
6. Ownership — I take responsibility for my code from development to production

Frontend
Backend
Databases
DevOps
Languages
Tools

I'm open to full-time positions, contract work, and interesting projects.

Looking for:

• Full-Stack Engineer roles
• Next.js / React specialist positions
• Technical leadership opportunities
• Remote or hybrid positions in Czech Republic

Contact:

• 📧 Email: dev@dxvil.com or jaroslav26masa@icloud.com
• 💼 LinkedIn: linkedin.com/in/jaroslavmasa
• 🌐 Portfolio: jaroslavmasa.dev
• 💻 GitHub: github.com/automataevox
• 📍 Location: Prague, Czech Republic

"Code with purpose. Build for scale. Ship with confidence."