I’m Hamid Yousefi, a Unity C# Gameplay & Multiplayer Developer focused on building responsive game mechanics, scalable systems, and production-ready builds.
I can help with:
✔ Core gameplay systems and mechanics
✔ Multiplayer and online game features
✔ Leaderboards, achievements, and progression systems
✔ New feature development and existing feature improvements
✔ Rapid prototyping and vertical slices
✔ Bug fixing, optimization, and performance improvements
✔ Android / iOS / WebGL build support
I write clean, maintainable, and scalable code designed for long-term development. Whether you need a gameplay programmer for a new prototype, a developer to add and expand Unity features, or technical support to fix and improve an existing project, I can help deliver a stable and polished result.
For full game projects, I handle the programming side directly and can also collaborate with a trusted team for art, animation, and audio support when needed.
If you’re looking for a reliable Unity developer who can build systems, add features, improve gameplay, and turn ideas into playable results, I’d be happy to discuss your project.
Unity
C#
Game Development
Mobile Game Development
Multiplayer
Video Game
Game Mechanics
Game Development Bug Fix
Performance Optimization
Online Multiplayer
WebGL
Android
iOS Development
Game Design
Photon Unity Networking
Hamza K.
Istanbul, Turkey
$12/hr
5.0
5 jobs
𝐈'𝐦 𝐇𝐚𝐦𝐳𝐚 — a B2B Automation Engineer, Unity 3D Mobile Game Developer (C#) & QA Specialist with an engineering mindset. I don't just complete tasks; I build robust Python scripts, architect technical game prototypes, and bulletproof your software's user experience.
I don't just "freelance" — I take full ownership of your product's code, your data pipelines, and your peace of mind.
📋 𝐇𝐞𝐫𝐞'𝐬 𝐄𝐱𝐚𝐜𝐭𝐥𝐲 𝐖𝐡𝐚𝐭 𝐈 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 𝐅𝐨𝐫 𝐘𝐨𝐮:
🎮 Unity 3D Mobile Game Development (C#)
✅ Technical Game Design: Engineering playable 3D prototypes from scratch in Unity using C#
✅ Core Mechanic Development: Building character controllers, physics-based interactions, and UI systems
✅ Optimization & C# Scripting: Debugging code, refactoring scripts, and optimizing games for mobile performance
✅ Asset Integration & Technical Art: Balancing Level Design in Unity with technical coding requirements
🕵️♂️ QA Engineering & Testing
✅ Rigorous Exploratory Testing: Identifying critical edge cases and "hidden" bugs before production
✅ Android/iOS & Web QA: Comprehensive layout audit, database input validation, and API endpoint verification
✅ Game QA & Technical Audits: Frame-rate scaling, device-specific scaling issues, and mechanic deconstruction
✅ Engineer-Friendly Reports: Step-by-step reproduction guides, full logs, and video briefs (Check my portfolio section)
🤖 Web Scraping & Data Automation (Python)
✅ Custom Scrapers for Dynamic Sites: Playwright, BeautifulSoup, and Selenium for e-commerce, real estate, and directories
✅ Data Pipelines & Verified B2B Lead Gen: Cleaning bounce rates to under 3% and formatting data for CRMs
✅ Automated Scheduled Extraction: Scheduled bots that bypass detection and deliver clean JSON/Google Sheets
✅ Competitive Intelligence: Extracting market and competitor data for structured, high-level analysis
⚡ Real Results Delivered:
→ 100k+ dynamic data points scraped, cleaned, and structured for B2B outreach
→ 100% autonomous execution of QA audits for mobile apps, stopping critical UI leaks before release
→ Unity 3D prototypes engineered from idea to playable C# builds within days
→ Zero-error CRM data migrations and automated database list cleaning
🔧 Tools I Work With Daily:
Unity (C#) · Python · Playwright · BeautifulSoup · Selenium · Excel · Google Sheets · Airtable · SmartLead · Apollo · LinkedIn Sales Navigator · Jira · ClickUp
🌟 What Sets Me Apart:
I respond within 1–2 hours. I communicate before problems happen, not after. I think like a Software Engineer and execute with a QA tester's precision. Micromanagement is not required — you give me the technical goal, I deliver it optimized, clean, and exactly how you need it. No excuses. No disappearing acts.
Available 30+ hours per week. Consistent daily overlap with US Eastern and European time zones.
If your game mechanics are clunky, your code is a mess, your data scrapers are broken, or your app's UI is overflowing let's engineer a solution.
Send me a message. I'll reply within a couple of hours with a clear, engineering led plan.
Google Play
Unity
Python
C#
Software
Flutter
Data Analysis
.NET Core
.NET Framework
Angular
React
Yousif S.
Istanbul, Turkey
$35/hr
5.0
23 jobs
Software engineer for more than 8 years
Fullstack & Game Developer with more than 8 years experience
➡️ Unity Custom Editor Extensions 🪛
➡️Back-end Development (Node.js, Golang) ✅
➡️Advance Multiplayer Network (Fusion & PUN2) 🌐
➡️REST API & GraphQL ✅
➡️Front-end Development (Svelte, React with Next) ✅
➡️Responsive Design (Tailwind, Bootstrap) ✅
➡️Microsoft Playfab (Integrated with Photon Webhook)
➡️Microsoft Azure Functions
➡️Unity Services 🧰
➡️Hyper Casual Game Development
➡️Dynamic Terrain & Mesh Generation
➡️Game Optimization (Mobile & Desktop) 🚀
➡️Game backend development (With Node.js)
➡️ MongoDB & Realm 💾
➡️ Detailed Level Design
➡️ Publishing to GooglePlay and Appstore
➡️ Mobile SDKs, Facebook, Applovin, GameAnalytics SDK
➡️Single-Page & Multi-Page Web Application ✅
➡️SQL & NoSQL Databases (Mysql, Postgress, MongoDB) ✅
➡️Research, Ideas, Teamlead, Milestones Document (splitting your project into logical independence milestones to be assigned to different team members to work on simultaneously) ✅
➡️Website Optimization 🚀
JavaScript
Photon Unity Networking
MongoDB
Tailwind CSS
Realm Database
NodeJS Framework
Svelte
Yusuf G.
Istanbul, Turkey
$100/hr
5.0
1 jobs
🚀 Hi there! I’m a Senior Unity and Node.js Developer with 6+ years of experience building mobile games, interactive applications, and scalable backend systems.
💡 What I can do for you:
Mobile Game Development (Unity 2D/3D, URP, Spine, Shader Graph)
Multiplayer Solutions using Colyseus / WebSockets
Backend Development with Node.js, Express, Firebase, and REST/GraphQL APIs
In-App Purchases, Ads & Monetization Systems
App Publishing to Google Play & Apple App Store
Performance Optimization for mobile (FPS, memory, CPU/GPU usage)
✨ Why work with me?
I focus on clean, maintainable code and long-term scalability.
Experienced in full project lifecycle: from prototype to release.
Strong background in problem-solving and optimization.
Easy to communicate with, reliable, and deadline-oriented.
If you’re looking for someone to bring your mobile game, app, or backend system to life and support you all the way to publishing, I’d be happy to help. Let’s build something great together!
Unity
C#
Game
Mobile Game Development
Video Game
Sensei K.
Istanbul, Turkey
$15/hr
4.8
82 jobs
I’m a Unity Game Developer who helps clients ship solid mobile and PC games—from prototype to production. I build clean, scalable gameplay systems in C# and I’m comfortable with both synchronous & asynchronous programming (UniTask/Task, async/await), plus event-driven architecture (events, Actions, delegates) to keep projects maintainable.
On the backend/product side, I integrate Firebase end-to-end: Authentication, Realtime Database / Firestore, Storage, analytics/events, cloud data flows, and user/session systems. I also implement Unity Localization properly (keys, tables, runtime updates, dynamic text, UI consistency), so multi-language support doesn’t turn into a mess later.
I can support the full release pipeline: performance optimization, UI systems, debugging tricky runtime/editor issues, and publishing to App Store / Google Play (build settings, signing, Xcode/Gradle problems, IAP/Subscriptions, AdMob if needed).
What you can expect from me:
Clear communication + realistic delivery
Production-ready code (readable, testable, easy to extend)
Strong debugging skills for “hard” Unity problems
A developer who focuses on finishing and shipping, not just “making it work”
If you want a reliable Unity dev for new features, Firebase integration, localization, or build/publishing fixes, message me with your goal and current project status.
Game Design Document
Mobile Game
C#
Unity
Game Development
Gaming
PC Game
Simulation Game
Game
Video Game
Game Design
Game Testing
In-Game Advertising
Game Development Bug Fix
Game Prototype
Yunus S.
Istanbul, Turkey
$6/hr
5.0
3 jobs
I'm currently getting started as a Game Tester and have a strong interest in indie game development. While I haven't worked on a professional title yet, I’m learning game development with Godot and working on two of my own projects: Jonah: The Redemption Path, a narrative-driven 2D platformer, and a mobile duel game.
I have experience in design and visual tools like Photoshop, and with a background in architecture, I’m used to analyzing visual and interactive design from a user-focused perspective. I'm fluent in English and have years of gaming experience, which helps me identify gameplay, balance, and usability issues. I’m actively improving my QA testing and bug reporting skills, and I’m flexible with pricing.
Beta Testing
Alpha Testing
Game
Godot
Game Development
Game Testing
QA Testing
Bug Reports
Book Review
Pixel Art
2D Game Art
English to Turkish Translation
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