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I will fix unity game bugs, crashes, build errors, optimization for performance fps lag
Vitalii N.
5.0
5.0
About this gig
Please message me before placing an order.
Is your Unity game crashing, lagging, failing to build or stuck on a bug nobody can track down?
I am a Senior Unity Developer with 8+ years in Unity, 6+ commercially, and 11+ years in C#. I debug and troubleshoot to the root cause, fix it, test it and explain what changed, on Android, iOS, PC and WebGL.
What I fix:
- Bugs, crashes, exceptions and broken game logic
- Unity build errors, plugin and SDK conflicts
- Low FPS, lag, memory spikes and slow loading
- UI, save, progression and gameplay issues
- Small features that do not work right
- WebGL and mobile stability on low-end devices
Proof from my projects:
- MegaMod: tuned WebGL memory and performance for low-end devices
- Explore Montfaucon: optimized shaders and models for high FPS in long AR sessions
- notAlone, Explore Montfaucon: App Store apps, I set up their TestFlight builds
- 30+ Unity projects delivered
Please note:
I need the Unity project or source access. A new game or a large system is a separate offer.
Important: each extra bug is the Additional Bug Fix extra; see the FAQ.
Send me your Unity version, platform, the issue and a log or a video, and I will tell you the next step.
Get to know Vitalii N.
Vitalii N.
Unity Game Developer: 2D, 3D Mobile Games, WebGL, Multiplayer, SDKs, Bug Fixing
- FromUkraine
- Member sinceSep 2025
- Avg. response time1 hour
- Last delivery1 month
Languages
English, Ukrainian, Russian
🎮 Senior Unity Developer | 8+ years in Unity, 11+ in C#
🚀 Results:
• Photon Fusion multiplayer holding 200+ CCU per server
• modular core with 90% code reuse across 7+ products
• 30+ SDKs and services: AdMob, AppLovin, IAP, Firebase, Amplitude, Xsolla, Discord
📦 I build and fix:
• 2D/3D mobile games for Android/iOS, plus PC, AR and WebGL
• prototypes, reskins, multiplayer, gameplay systems, editor tools
• bug fixing, profiling and optimization for low-end devices
🧩 How I work: Git, Jira or a similar tracker, clear tasks, regular builds, and early questions when something is unclear.
My Portfolio
Other Game Development Services I Offer
FAQ
What do you need before starting?
Your Unity version, the target platform, a description of the issue with the steps to reproduce it, the Unity project or source access, and any logs, error messages, screenshots or a short video. Message me first, and I will confirm the scope and the package before you order.
Can you fix Android and iOS build errors?
Yes: failed builds, plugin and SDK conflicts, and broken project settings. On notAlone, MegaApp and Explore Montfaucon, apps I developed that were released on the App Store, I set up the TestFlight builds and helped with signing and App Store Connect.
Can you improve FPS, memory and loading time?
Yes. I profile first to find what really costs frames, memory or loading time, then fix the biggest costs in code, assets, shaders or UI. I tuned WebGL memory and performance for low-end devices on MegaMod and kept frame rates high in long AR sessions on Explore Montfaucon.
Do you work with WebGL projects?
Yes. On MegaMod I built the Unity-to-JS bridge to a React web app, tuned WebGL memory and performance for low-end devices, and worked on Photon Fusion multiplayer with 200+ CCU per server in WebGL. Browser crashes, memory errors and slow loading are all in scope.
Can you fix or finish a small feature?
Yes. A mechanic, a UI screen, a save system or a progression step that does not work as intended fits Standard or Premium. A new game or a large new system is a different service, so message me and I will suggest a custom offer.
Can you work without the source code?
For most fixes, no: I need the Unity project or access to the repository to find the real cause. For a build error, a full build log is sometimes enough to name the cause before you order. Without the project I can advise, but I cannot test a fix.
What if the bug cannot be reproduced?
Send me a video, the logs and the device or browser details first. If I still cannot reproduce it, I tell you what I checked and what I found, and we agree on the next step before any more work is done. This is why I ask you to message me before ordering.
Do you explain what you changed?
Yes. Each delivery comes with a short note: the cause of the issue, what I changed and where, and how to test the fix. Questions about the fix after delivery are welcome, within the revisions of your package. You keep full ownership of your project and code.
Reviews
1 reviews for this Gig
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
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N nataliasush
Ukraine
Vitalii fixed the crash in my Unity mobile game and improved performance. Communication was clear, delivery was on time, and the final build worked as expected. Highly recommended.
$50-$100
Price
1 day
Duration
Helpful?
Reviews
1 reviews for this Gig
| (1) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
N nataliasush
Ukraine
Vitalii fixed the crash in my Unity mobile game and improved performance. Communication was clear, delivery was on time, and the final build worked as expected. Highly recommended.
$50-$100
Price
1 day
Duration
Helpful?
