Just0Simon
Ivan Hoina | Unity Game Developer
Warsaw, Poland · Open to Remote
3+ years building mobile and PC games — from rapid hyper-casual production to multiplayer systems. 8+ titles shipped commercially to the App Store and Google Play. I care about clean architecture, gameplay that feels good, and getting things actually released.
📧 hoina.ivan@gmail.com · 💼 LinkedIn · 🐙 GitHub · 📄POLISH CV 📄ENGLISH CV 📄UKRAINIAN CV
🚢 Shipped Titles
Commercial games I developed or maintained across two studios and contract work:
- 24Play (Kyiv) — 8+ hyper-casual games shipped to App Store & Google Play. Gameplay mechanics, UI, animations, SDK integrations, mobile performance optimization.
- Wild Wild Group — hyper-casual iOS games, full production cycle from prototype to App Store release.
- EJAW — maintained and updated live Unity titles on Google Play: SDK migrations, post-migration fixes, stability improvements.
Some titles are under NDA — I’m happy to walk through the specifics in a conversation.
Featured Projects
🕹️ Multiplayer Arena — server-authoritative networking with Netcode for GameObjects
A multiplayer arena demo exploring Host-Client architecture, server-authoritative gameplay, and real-time state synchronization.
What’s interesting technically:
- Server-authoritative logic: all gameplay decisions (AI, projectiles, damage) run on the host — clients can’t cheat
- Server-driven enemy AI: spawning, targeting, rotation, and projectile fire fully synchronized across clients
- Networked projectiles with collision-based damage and a replicated health system
- Third-person camera (Cinemachine) + New Input System + baked NavMesh navigation
Tech: Unity 6 LTS · Netcode for GameObjects · Cinemachine · New Input System · AI Navigation
▶️ Watch gameplay · 📦 Source on GitHub
Code worth reading:
⚫ The Abyssal Truth — Global Game Jam 2025, team lead
First-person horror puzzle set in an island laboratory, built in one game-jam weekend with a team of five (game designer, art generalist, two developers). I led the team: task distribution, technical direction, and core gameplay implementation.
My contributions:
- Designed and built the central gameplay system: a laboratory-wide device monitoring network that feeds the player diagnostic information — but some readings lie, and players must separate truth from deception to find what’s actually broken
- First-person controller, interaction systems, main menu and in-game HUD
- Unblocked teammates on core technical challenges throughout the jam
Shipped on time, fully playable.
Tech: Unity 6 · Windows
🎮 Game jam page · 📦 Source on GitHub
🛸 Untitled Ship Game — work in progress (s&box, C#)
My current personal project, built in s&box (Facepunch’s C# engine) — exploring a different engine to broaden my architectural perspective beyond Unity.
Built so far:
- Physics-driven 2D ship movement on a Rigidbody, with both simulation-style (force/torque) and arcade-style (interpolated velocity) control schemes — tuned for game feel, not realism
- World-space interaction system: eye-origin raycast detection with screen-projected UI prompts (
InteractionWorldPanel) - Gizmo-based visual debugging tools for raycast and physics inspection
Devlog-style updates coming as the project grows.
Other projects
- 3D Runner — one-level mobile runner with swipe controls, modular event-driven architecture (ScriptableObjects, loose coupling), responsive UI. Video · Source
Skills
Core: Unity · C# · OOP · SOLID · Dependency Injection (Zenject) · Git Networking: Netcode for GameObjects · Photon Fusion Unity: Physics · AI Navigation · UI Canvas · Animations · Tweening (DOTween) · Shader Graph · ScriptableObject architecture Services & Mobile: Unity Game Services · Firebase · In-App Purchases · iOS & Android release pipelines · mobile performance optimization Other engines: s&box (C#)
Experience at a Glance
| Role | Company | Period |
|---|---|---|
| Unity Developer | Wild Wild Group (remote) | Aug – Oct 2025 |
| Unity Developer | EJAW (remote, contract) | Oct 2024 – Jan 2025 |
| Unity Developer | Self-employed: personal projects & teaching Unity | Sep 2022 – Oct 2024 |
| Unity Game Developer | 24Play (Kyiv) | Feb – Sep 2022 |
Full details in my CV (PDF).
Contact
📧 hoina.ivan@gmail.com 💼 linkedin.com/in/ivan-hoina 🐙 github.com/Just0Simon