Oleksander H.
MERN Stack Developer
Experience
Jan 2019 - Present
6 years 11 monthsKyiv, Ukraine
Front-End Application Developer
Pekarium
- Built a WebGL-based single-page trading platform for desktop web, mobile web, and iOS WebView integration.
- Engineered a custom data-visualization tool with infinite zoom, variable detail levels, and multiple rendering modes.
- Implemented custom Three.js renderers, GLSL shaders, and procedural mesh generation for real-time data.
- Designed flexible architecture supporting data from network streams and mathematical models.
- Added annotation layers, interactive chart tools, and random data simulation features.
- Collaborated with backend engineers for WebSocket-based real-time data sync.
- Integrated React Hooks, Context API, and dynamic component loading for modular UI.
- Reduced rendering latency by ~30% through memory profiling and frame budget tuning.
- Integrated Unreal WebSockets for real-time PVP communication with Node.js server.
- Built reusable combat systems and in-game debug tools to accelerate testing.
- Managed multi-environment builds and CI/CD pipelines with Docker and GitHub Actions.
- Mentored junior developers and reviewed pull requests for code quality and standards.
Jan 2016 - Dec 2019
4 yearsLead Game Developer (Unreal Engine 4)
Monolith Mind
- Led client-side development of an online collectible card game built in UE4.
- Created the full battlefield UI and combat logic using Blueprints and C++.
- Implemented ECS pattern for modular game systems and network sync.
- Collaborated with design and art teams to integrate VFX and animations without performance drops.
- Optimized CPU/GPU bottlenecks and reduced draw calls by 25%.
- Established version-controlled pipelines using Perforce and Git.
- Delivered fully functional battle prototype within six months for QA testing.
- Coordinated cross-disciplinary workflow between Unreal and web teams.
Jan 2015 - Dec 2016
2 yearsKyiv, Ukraine
JavaScript Game Developer
PrivateDev
- Developed a minimalistic JavaScript game engine using PIXI.js and Howler.js.
- Ported multiple gambling titles to the engine with optimized mobile and desktop performance.
- Implemented custom event bus and game loop patterns for real-time updates.
- Applied object-oriented design principles for reusability and maintainability.
- Integrated touch controls, sound management, and resource loading systems.
- Designed debugging interfaces for testing game logic and physics.
Jan 2013 - Dec 2015
3 yearsKyiv, Ukraine
Front-End Developer
Freelance
- Delivered interactive web projects for local clients using HTML, CSS, and vanilla JavaScript.
- Created a Match-3 browser game prototype using Canvas and DOM manipulation.
- Experimented with game loops, collision detection, and render optimization.
- Implemented responsive layouts for multi-device compatibility.
Summary
Software Engineer with 8 + years of experience developing high-performance applications across web, data-visualization, and game engine domains. Specialized in JavaScript (ES6 +), React, Node.js, and WebGL, with expertise in rendering optimization, scalable architecture, and interactive UI/UX. Strong record of delivering cross-platform systems that run efficiently on desktop, mobile, and embedded devices. Passionate about clean architecture, real-time performance, and exploring the intersection of web and 3D graphics.
- Expert in React.js / Node.js / Three.js / TypeScript development
- Skilled in real-time visualization and custom shaders
- Proven ability to design and optimize complex front-end architectures
- Excellent debugging, profiling, and CI/CD automation skills
- Strong team collaboration and Agile experience
Languages
English
AdvancedEducation
Oct 2011 - Jun 2015
Donetsk National Technical University
Bachelor's Degree in Technical Information Security, Radioelectronics · Technical Information Security · Donetsk, Ukraine
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