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NilzeyX/README.md

Freelance Developer! 🚀

I'm a Freelance Full-Stack Mobile & Web Developer with 3 years of experience, and over time, I’ve learned that frameworks and languages change, but strong core skills remain valuable.

Many developers rely on high-level tools that simplify programming, but I focus on understanding the core mechanics behind the code—allowing me to adapt, build efficiently, and deliver reliable applications across platforms.

🛠 Tech Stack

Languages & Frameworks I love

  • Swift & SwiftUI – Developing iOS apps with a modern, declarative UI.
  • JavaScript & TypeScript – Writing maintainable, scalable, and efficient applications.
  • React & Next.js – Building fast, interactive, and SEO-friendly web applications.
  • Node.js & Express.js – Handling backend logic, APIs, and server-side operations.
  • HTML & CSS – Structuring and styling clean, responsive web layouts.
  • SQL & NoSQL Databases – Working with relational (PostgreSQL, MySQL) and non-relational (MongoDB, Firebase, Supabase) databases.

Languages & Frameworks I have used

  • Metal – Low-level graphics programming for high-performance rendering and shader development.
  • Three.js & WebGL – Creating interactive 3D experiences on the web.
  • Flutter & React Native - Developing Cross platform apps or Android specific apps.
  • Python & Flask – Writing automation scripts, backend services, and working with AI/ML libraries
  • Ruby on Rails - Dashboards for CRUD, API deveolpments, Ecommerce Apps

Tools & Platforms

  • Xcode – Primary development environment for iOS applications.
  • Cursor – AI-enhanced editor for faster and smarter coding, with VSCode plugins underneath.
  • Git & GitHub – Version control and seamless collaboration (I mean what other tool is there lol).
  • Firebase & Supabase – Backend services for authentication, real-time databases, and cloud functions.
  • AWS – Experience with AWS Lambda, S3, DynamoDB, EC2, and other cloud infrastructure for scalable deployment.
  • Docker & CI/CD Pipelines – Automating builds, testing, and deployment with tools like GitHub Actions and AWS CodePipeline.

Testing & Debugging

  • Jest & React Testing Library – Ensuring front-end stability with unit and integration tests.
  • XCTest & XCTestUI – Writing and automating tests for iOS applications.
  • Postman & Thunder Client – API testing and debugging for backend services.
  • ESLint & Prettier – Enforcing code quality and consistency across projects.

🔍 My Agencies Portfolio <- Click the link to see more!

  • Everflame Calendar – A clean, design-focused calendar app featuring a dashboard, simple analytics, and full CRUD functionality for users. Integrated external APIs and built with SwiftUI (iOS), Node.js (backend), and PostgreSQL for data management.
  • Venstar Website – Enhanced the frontend for an enterprise-level company, implementing custom JavaScript functions, refining UI/UX, and optimizing internal API calls for better performance. Built with Next.js, TypeScript, and AWS for backend interactions.
  • AstraVault – Developed a full-scale fintech mobile app and website, integrating a Python (Flask/Django) backend for secure transactions. Used React (web) and Flutter (mobile) for a responsive, modern UI.
  • Flobody App – Designed and built a Swift-based fitness app for an eCommerce company specializing in pilates. Created a custom backend with Firebase, integrated admin dashboards, and developed in-app purchases and content management for fitness creators.

📌 My Approach to Development

Being a freelancer you have to switch between new tools, therefore I chose to focus on core programming concepts that apply across all technologies:

  • Algorithm Design & Computational Thinking – Writing efficient logic, optimizing time and space complexity, and understanding recursion, sorting, and search algorithms.
  • Mathematics & Physics – Implementing real-world simulations, handling vector math, collision detection, and working with physics-based animations.
  • Memory Management & Performance Optimization – Understanding Swift’s ARC (Automatic Reference Counting), JavaScript’s garbage collection, and how memory allocation affects performance.
  • Inheritance, Protocols & Type Systems – Using Swift’s protocol-oriented programming, TypeScript’s type safety, and JavaScript’s prototype-based inheritance to write reusable, maintainable code.
  • Compilers & Rendering Pipelines – Understanding Swift’s compilation process, JavaScript’s JIT (Just-In-Time) compilation, and how rendering works in Metal and WebGL for efficient graphics.
  • Networking & API Architecture – Working with REST and WebSockets, optimizing API calls with async/await, and structuring backend services in Node.js and Express.
  • UI & State Management – Handling SwiftUI’s declarative UI, React’s component lifecycle, and managing state efficiently with Redux, Zustand, or Swift Combine.

By focusing on these core principles, I can quickly adapt to different tech stacks—whether it's Swift, JavaScript, Flutter, Python or beyond. The specific tools may change, but the underlying knowledge remains applicable. This allows me to be versatile as a Freelancer for different projects.

🎯 Development Philosophy

I prioritize efficiency, reliability, and adaptability. My deep understanding of the underlying code architecture allows me to transition seamlessly between different technologies without being dependent on specific frameworks.

I focus on writing clean, maintainable code that delivers consistent performance and usability—whether for web applications, mobile apps, or graphics programming.

📬 Let's Connect

I'm open to new projects and collaborations. Feel free to reach out.

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  1. swiftUI-opendesign Public

    Swift

  2. Javascript-Physics Public

    JavaScript