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Refactoring my way through Middle-earth: fewer orcs, more clean architecture.
💭
Refactoring my way through Middle-earth: fewer orcs, more clean architecture.
14 followers · 23 following

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MarkFeder/README.md

👋 About Me

  • 🎮 Senior Software Engineer with 10+ years shipping production software end to end, from AAA game UI on Unreal and Frostbite to full stack backends and a real time mobile app built solo.
  • 🕹️ Currently leading UI systems at Companion Group and contributing on chain programs to the Solana Foundation.
  • 🌍 Deep experience in large scale UI architecture, internationalization across 15+ languages (bidirectional and complex scripts), and reliable backend services.
  • 🦀 Fluent across C++, C#, TypeScript, Python, and Rust, comfortable owning a feature from architecture through release.
  • 📫 Reach me at m.arjona@outlook.com

🛠️ Tech Stack

Languages

C++ C# TypeScript JavaScript Python Rust

Frontend

React React Native HTML5 CSS3

Backend

Node.js Express .NET Django

Databases

MongoDB PostgreSQL Redis SQLite

DevOps & Cloud

Docker GitHub Actions AWS Git

Game & Web3

Unreal Engine Unity Solana

📊 GitHub Stats

stats top languages
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trophies

🚀 Featured Projects

  • WildSoul — Real time mobile dating app built solo end to end (React Native, Express/TypeScript, MongoDB, Socket.io, Redis), load tested to 50,000 concurrent users and deployed via Docker and GitHub Actions.
  • Solana program-examples — Ongoing open source contributor to the Solana Foundation, with 11 merged PRs porting on chain programs to Pinocchio (no_std Rust) across core examples and a full Token-2022 extensions series.
  • crypto-wallet-mvp — Full stack multi currency wallet (BTC, ETH, USDT) with HD derivation, token swapping, JWT auth, and 78 tests.
  • url-shortener — Lightweight URL shortener in Rust (Actix-web, SQLite) with API key auth, caching, Prometheus metrics, rate limiting, and 192 tests.

🤝 Connect

LinkedIn Email GitHub

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Pinned Loading

  1. miami-sunrise-tracker miami-sunrise-tracker Public

    A beautiful web application to track the best sunrise viewing days in Miami, Florida

    JavaScript

  2. solana-foundation/program-examples solana-foundation/program-examples Public

    A repository of Solana program examples

    TypeScript 1.4k 539

  3. netflix-cbp-dashboard netflix-cbp-dashboard Public

    Netflix Content-Based Personalization Dashboard

    JavaScript

  4. crypto-wallet-mvp crypto-wallet-mvp Public

    A crypto wallet MVP with multi-currency support (BTC, ETH) and transaction management

    TypeScript

  5. url-shortener url-shortener Public

    A fast, lightweight URL shortener built with Rust, Actix-web, and SQLite.

    Rust

  6. NSEH NSEH Public

    This is the NSEH game repository made in Unity3D

    C#