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I'm Javier Matejko, a Senior Unity Developer with 5+ years of experience building production mobile and WebGL applications using C# and Unity Engine. I’ve shipped titles on Google Play and the App Store, and I specialize in gameplay systems, modular architecture, and performance optimization. I thrive in cross-functional teams, designing scalable systems and delivering high-quality Unity products. My work has driven measurable improvements, including a 50% reduction in build size and a 35% boost in input performance.…I'm Javier Matejko, a Senior Unity Developer with 5+ years of experience building production mobile and WebGL applications using C# and Unity Engine. I’ve shipped titles on Google Play and the App Store, and I specialize in gameplay systems, modular architecture, and performance optimization. I thrive in cross-functional teams, designing scalable systems and delivering high-quality Unity products. My work has driven measurable improvements, including a 50% reduction in build size and a 35% boost in input performance.

Javier Matejko

Game Developer, Programmer, Developer, +4

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I'm Javier Matejko, a Senior Unity Developer with 5+ years of experience building production mobile and WebGL applications using C# and Unity Engine. I’ve shipped titles on Google Play and the App Store, and I specialize in gameplay systems, modular architecture, and performance optimization. I thrive in cross-functional teams, designing scalable systems and delivering high-quality Unity products. My work has driven measurable improvements, including a 50% reduction in build size and a 35% boost in input performance.…I'm Javier Matejko, a Senior Unity Developer with 5+ years of experience building production mobile and WebGL applications using C# and Unity Engine. I’ve shipped titles on Google Play and the App Store, and I specialize in gameplay systems, modular architecture, and performance optimization. I thrive in cross-functional teams, designing scalable systems and delivering high-quality Unity products. My work has driven measurable improvements, including a 50% reduction in build size and a 35% boost in input performance.

Available to hire

I’m Javier Matejko, a Senior Unity Developer with 5+ years of experience building production mobile and WebGL applications using C# and Unity Engine. I’ve shipped titles on Google Play and the App Store, and I specialize in gameplay systems, modular architecture, and performance optimization.

I thrive in cross-functional teams, designing scalable systems and delivering high-quality Unity products. My work has driven measurable improvements, including a 50% reduction in build size and a 35% boost in input performance.

Skills

Unity

Unity 3D

GitHub

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Spanish; Castilian

Fluent

English

Advanced

Portuguese

Advanced

Work Experience

Core Developer & Architecture Contributor at TGA

September 1, 2022 - December 1, 2025

Joined the flagship product from inception, shaping architecture and a modular portal to integrate multiple feature modules. Built internal UI tooling increasing development productivity by 15% and mentored teammates on architecture standards, reducing onboarding time by 20%. Led Unity Addressables for asynchronous loading, reducing initial store size by 40% and enabling on-demand content. Optimized dialog loading by 50% and implemented full app localization. Contributed to iOS, Android, and WebGL releases and integrated PlayFab, Firebase, and Strapi for backend services and analytics.

Unity Developer at Pathfinder’s Studio

June 1, 2021 - September 1, 2022

Contributed to Time Blast – World Renovation for Android, driving core gameplay improvements. Redesigned swipe-based block interaction, improving responsiveness and input accuracy. Implemented UI flows across screens and features, collaborating with design to deliver a more dynamic puzzle experience.

Software Developer (.NET) at Sistemas Plenario S.A.

October 1, 2019 - June 1, 2021

Part of a 3-person team responsible for identifying and fixing client-reported issues, performing continuous code maintenance and bug resolution. Debugged and stabilized legacy code in C# and VB.NET, managed client communications, and handled incident reports. Performed MySQL tasks, tracked data-related issues, and validated fixes.

Senior Lead Unity Developer at Mental Health & Productivity Startup

December 1, 2025 - Present

Reduced feature implementation time by 30% across a cross-functional team of 6 developers, artists and designers by introducing a data-driven event architecture. Designed and implemented UI systems, core gameplay systems, authentication and user registration flows, and AI chat integrations during the product prototyping and architecture phase. Integrated backend services using Supabase authentication, REST APIs, and database services for secure user management and application data. Implemented a WebGL deployment pipeline using Netlify, enabling continuous delivery and fast iteration cycles for browser-based Unity applications. Led the development team through code reviews, pair programming and technical standards, improving code quality and reducing integration issues. Collaborated with designers and stakeholders to implement scalable gameplay and application systems aligned with product goals.

Unity Developer (Architecture & Core Systems) at TGA

September 1, 2022 - December 1, 2025

Implemented Unity Addressables and Asset Bundle systems, reducing initial build size by 50% through asynchronous content loading. Contributed to the design and implementation of a modular Unity architecture used as the internal template for multiple company projects. Developed custom Unity Editor tools and UI tooling, increasing development workflow efficiency by 15%. Mentored developers on Unity architecture patterns, C# best practices, and gameplay system design, reducing onboarding time by 40%. Refactored a dialogue and narrative system, improving system loading performance by 50%. Designed and implemented a multi-language localization system supporting multi-language releases and international markets. Expanded a modular portal system architecture, enabling independent feature modules to integrate without tight coupling.