Kartny

Senior Unity developer

Celadon Soft • Fulltime

Jan 2025 - Mar 2026 • 1 yr 2 mos

Technologies: C#, Unity, Nakama, Firebase Firestore, Firebase Auth, Firebase Cloud Messaging, Crashlytics, Facebook SDK, Apple Sign-In, Google Sign-In, OneSignal, Sentry, Unity Localization • Solely responsible for Firebase infrastructure: Firestore security rules, indexes, access control, and environment configuration • Integrated Nakama: match state transitions and in-game real-time chat • Implemented full FTUE flow: scripted step-by-step onboarding from zero to first match result • Architected full authentication system (Firebase Auth + Facebook, Google, Apple ID) with session persistence and account linking • Built end-to-end push notification pipeline (Android/iOS): deep-link routing from push tap → app activation → in-app navigation • Developed Mail Center: full CRUD via Firestore (send, receive, edit, delete) Implemented Season Pass reward system with server-driven progression and dynamic prize UI • Built paginated leaderboard with real-time server-side ranking • UI systems: Profile, FTUE, Settings, Ranking screens • Audio system architecture, SDK integration (Sentry, OneSignal)

Senior Unity Developer

Umdpersum Studio • Fulltime

Jun 2022 - Jan 2025 • 2 yrs 7 mos

Delivered 30+ commercial mobile games (iOS/Android) and WebGL projects from prototype to global launch. Key achievements & services provided: • Performance Optimization: Boosted FPS from 15 to 30+ on low-end devices by optimizing 3D meshes (LODs), textures, and code architecture (refactoring heavy logic to Jobs/Burst/Async). • Full-Cycle Development: Developed core gameplay mechanics, UI systems, and meta-game features for Strategy and Idle genres. • Backend & Multiplayer: Integrated real-time multiplayer features using Photon/Nakama and set up backend logic (REST API). • Monetization & Analytics: Successfully integrated AdMob, Unity Ads, and IAP (In-App Purchases) to maximize revenue, along with Firebase Analytics for user tracking. • Bug Fixing & Stability: Eliminated critical memory leaks and crashes using Unity Profiler, ensuring a stable experience for thousands of users. Tech Stack: Unity 3D/2D, C#, Firebase, DOTween, Addressables, Git.