Oleksandr Yelisieiev

Senior Unity Developer / CTO

Passionate game developer with over 10 years of experience in building commercial projects for PC and mobile. Strong expertise in Unity, gameplay systems, UI, tools, and optimization.

Leading teams and turning complex ideas into polished games

Skills

Unity / C#

  • Deep understanding of Unity internals, with experience building custom frameworks and engine extensions
  • Advanced C# skills: multithreading, reflection, assembly handling, and abstract architecture
  • Built a custom lightweight and extensible DI container used in production projects
  • Developed complex systems: UI, animation, scene management, resource loading, and cross-module event handling
  • Confident working with both Unity’s high-level API and low-level systems

CI/CD & Automation

  • Set up CI/CD pipelines using GitLab, Jenkins, and Unity Cloud Build for projects of various scales
  • Implemented pre- and post-build processes: versioning, obfuscation, SDK integration, deployment
  • Automated testing and build runs across multiple platforms
  • Ensured fast, stable release cycles with minimal manual work

Architecture & Design Patterns

  • Strong command of GoF patterns and SOLID, KISS, DRY, YAGNI principles
  • Designed architectures for large commercial projects from scratch
  • Created a personal architectural template for mobile projects - lightweight, scalable, and flexible
  • Extensive experience in documentation, system schematics, and architecture standardization

Mobile Platforms (iOS / Android)

  • Hands-on experience with every stage of mobile development - from build to store release
  • Native plugins (Java/Obj-C), push notifications, deep links, in-app purchases, Firebase, Appsflyer, etc.
  • Set up certificates, CI/CD pipelines, signing, AAB/IPA builds and delivery
  • Optimized performance under mobile hardware constraints and store requirements

Performance Optimization

  • Specialized in performance optimization for large-scale projects, including MMORPGs with tens of thousands of objects
  • Advanced CPU/GPU/memory profiling, mesh optimization, batching, allocation and rendering improvements
  • Architecture tailored for performance: pooling, custom solutions
  • Achieved stable FPS on low-end devices without sacrificing functionality
  • Delivered significant performance gains and stability for LiveOps support

SDK Integration & Monetization

  • Integrated a wide range of SDKs: analytics, ad networks, IAP, and custom solutions
  • Built flexible monetization systems with reward ads, A/B testing, and event tracking
  • Implemented data routing and backend integrations
  • Delivered stable, reusable monetization modules across platforms

Team Leadership & Mentorship

  • C-level leadership experience and process ownership
  • Led cross-functional teams (programming, art, UI/UX, business development, etc.)
  • Designed and maintained efficient production pipelines
  • Mentorship, code review, team development and training
  • Resource and priority management, including under tight budgets

Tools & Editor Scripting

  • Created complex custom tools and editor extensions of any scale
  • Developed custom UI rendering elements and mesh solutions optimized for production
  • Automated hundreds of routine tasks via Editor scripting - drastically reducing development time
  • Deep knowledge of UI Toolkit, custom inspectors and pipelines
  • Full control over editor UX: custom windows, scene tools, debuggers and integrations

Projects

Core Punk

MMORPG · PC · Developed by Artificial Core
Worked on a large-scale MMORPG project, focusing on the development and optimization of core gameplay systems. Contributed to scalable architecture, performance improvements, and feature implementation in a complex live environment. Collaborated with cross-functional teams to ensure stable, efficient, and maintainable systems.

Pool Stars

Mobile · iOS · Developed by Parana Games
Led the technical development and optimization of an online pool game with real-cash tournaments. Focused on gameplay, UI, and network synchronization to ensure smooth real-time matches. Integrated monetization, analytics, and third-party SDKs. Improved overall performance, scalability, and maintein of the project’s core architecture

Connect – Word

Mobile · iOS & Android · Developed by HitApps Games
Supported ongoing development and feature growth for a live word-association game. Added new gameplay elements, UI enhancements, and social features. Helped optimize performance and stability across device types. Collaborated with designers and backend engineers to enhance user engagement and retention

Syllatiles

Mobile · iOS & Android · Developed by HitApps Games
Contributed to the development and feature expansion of a word-puzzle title. Worked on gameplay mechanics (tile interactions, animations, scoring), UI enhancements, and polish. Optimized performance for smooth experience on a wide range of devices. Coordinated with designers and backend to ensure game balance and feature deployment

LexiLogic

Mobile · iOS & Android · Developed by HitApps Games
Helped evolve the project by building new puzzle mechanics, UI features, and user progression systems. Improved performance and memory usage across various devices. Worked alongside backend and design teams to deliver stable updates and maintain player engagement

Polygon Coloring

Mobile Prototype · Developed Independently for HitApps Games
Conceptualized and built a standalone prototype for a polygon-based coloring game. Designed mechanics for region detection, fill logic, level progression, and feedback animations. Implemented performance-safe rendering and touch-based interface suitable for mobile devices. Presented prototype for further development

Pixerio

Mobile · iOS & Android · Developed by HitApps Games
Provided ongoing support and feature development for a hidden-object puzzle game. Implemented new game modes, UI improvements, and user feedback enhancements. Optimized loading times, animations, and memory usage. Coordinated with backend and design teams to deliver stable updates and maintain user engagement

Hexa Block Drop

Mobile · iOS · Developed by HitApps Games
Independently built a puzzle prototype with block-dropping and color-sorting mechanics. Developed game logic for hexagon alignment, scoring, progression, and visual feedback. Optimized for responsiveness and fluid animations on mobile devices. Presented to stakeholders as a testbed for gameplay ideas

City Takeover

Mobile · iOS & Android
Focused heavily on performance optimization, reducing frame drops and memory peaks in this strategy / city-building game. Refactored core rendering, asset streaming, and garbage collection paths. Collaborated with art and backend teams to ensure feature updates didn’t degrade performance

Infantry Attack

Mobile · iOS & Android
Contributed new gameplay features and enhancements for the FPS mechanics (weapon behavior, AI, level interactions). Performance optimization: reduced latency, improved frame stability, and optimized memory management. Worked with the design and art teams to ensure seamless integration of updates without performance regressions

Hole.io

Mobile · iOS & Android
Driven feature development and performance tuning for this timing- and physics-based game. Enhanced core gameplay systems (collision, growth logic, multiplayer sync) and optimized for smooth frame rates on varied devices. Coordinated with cross-functional teams to integrate updates without degrading performance

Nile Valley

Mobile · iOS & Android
Designed and guided the software architecture for this project, refactoring the existing prototype into a scalable, maintainable codebase. Mentored team members on best practices, code quality, and system design. Led key technical decisions and ensured stable implementation of new features

Victory Belles – Shipgirls

Mobile · iOS & Android
Worked on this project as part of an outsourced team. Added gameplay features, UI enhancements, and optimized core systems. Enhanced performance, memory usage, and responsiveness across platforms. Collaborated with client-side teams to adhere to specifications and maintain consistent quality.

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Experience

Artificial Core

Unity Developer

February 2025 – Present (9 months)

Developing and optimizing core systems for a large-scale MMORPG. Responsible for gameplay features, performance improvements, and scalable architecture to support complex live environments

Parana Games

Lead Unity Developer

December 2024 – April 2025 (5 months)

Led technical development of mobile games, designed scalable architecture, and mentored the dev team. Integrated SDKs, automated builds, optimized workflows, and aligned tech with product vision

Hitapps

Unity Developer

November 2023 – October 2024 (1 year)

Supported multiple key projects, delivered new features, and improved monetization and UX. Built internal prototypes, enhanced modular architecture, and optimized workflows for faster delivery

Wow Meow

CTO

August 2023 – Present (2 years 3 months)

Built core architecture and development pipeline for multiple projects. Developed key internal systems, established coding standards, accelerated project setup, and mentored team members

GGG games

Sr. Unity Developer

April 2023 – November 2023 (8 months)

Focused primarily on performance optimization, including CPU/GPU profiling, memory management, and rendering improvements. Contributed to gameplay features and overall project stability

Stepico

Team Lead \ Unity Developer

April 2022 – April 2023 (1 year 1 month)

Took on team leadership and architecture responsibilities for the first time. Led a small development team, designed core systems, defined technical standards, and ensured stable project delivery

Ejaw

Unity Developer

May 2019 – February 2022 (2 years 10 months)

Developed gameplay systems and prototypes, built tools and SDKs for 3D char generation, optimized performance, and maintained build pipelines

SG Games

Unity Developer

November 2014 – April 2018 (3 years 6 months)

Worked on a wide range of game development tasks: implementing core gameplay features, UI, basic tools, and build pipelines

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