Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Game developer with 10+ years of experience specializing in Lua, Java, and C++ to build dynamic, high-performance gameplay systems. I focus on scalable object-oriented frameworks, reliable data management, and performance optimization for live products used by millions of players. I’ve led and delivered features in both independent and collaborative environments, including large-scale Roblox titles and brand partnership games. My work is user-centric, maintainable by design, and driven by clear technical execution and strong communication with creative and engineering partners.…Game developer with 10+ years of experience specializing in Lua, Java, and C++ to build dynamic, high-performance gameplay systems. I focus on scalable object-oriented frameworks, reliable data management, and performance optimization for live products used by millions of players. I’ve led and delivered features in both independent and collaborative environments, including large-scale Roblox titles and brand partnership games. My work is user-centric, maintainable by design, and driven by clear technical execution and strong communication with creative and engineering partners.

Sebastian Seifert

Game Developer, Game Designer, Programmer





Game developer with 10+ years of experience specializing in Lua, Java, and C++ to build dynamic, high-performance gameplay systems. I focus on scalable object-oriented frameworks, reliable data management, and performance optimization for live products used by millions of players. I’ve led and delivered features in both independent and collaborative environments, including large-scale Roblox titles and brand partnership games. My work is user-centric, maintainable by design, and driven by clear technical execution and strong communication with creative and engineering partners.…Game developer with 10+ years of experience specializing in Lua, Java, and C++ to build dynamic, high-performance gameplay systems. I focus on scalable object-oriented frameworks, reliable data management, and performance optimization for live products used by millions of players. I’ve led and delivered features in both independent and collaborative environments, including large-scale Roblox titles and brand partnership games. My work is user-centric, maintainable by design, and driven by clear technical execution and strong communication with creative and engineering partners.

Available to hire

Game developer with 10+ years of experience specializing in Lua, Java, and C++ to build dynamic, high-performance gameplay systems. I focus on scalable object-oriented frameworks, reliable data management, and performance optimization for live products used by millions of players.

I’ve led and delivered features in both independent and collaborative environments, including large-scale Roblox titles and brand partnership games. My work is user-centric, maintainable by design, and driven by clear technical execution and strong communication with creative and engineering partners.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Javanese

Advanced

Work Experience

Remote Game Developer at Atlas Creative

February 1, 2025 - February 1, 2026

Led a feature-parallel rewrite of a legacy game with a complex, problematic codebase, delivering a scalable and maintainable solution within a tight timeframe. Designed and implemented core gameplay mechanics for an NBA brand partnership game, including both front-end and back-end systems. Delivered highly maintainable and optimized code to preserve long-term scalability and ensure a high-quality player experience.

Remote Game Developer at Supersocial

February 1, 2024 - March 1, 2024

Refactored legacy codebases to improve readability and scalability, streamlining ongoing development and future updates. Rapidly onboarded and adapted to proprietary tools, enabling feature expansions and user experience improvements within project timelines.

Freelance Game Developer

May 1, 2022 - Present

Engineered scalable game mechanics and object-oriented frameworks for systems used by millions of users (e.g., Koala Cafe and The Grand Crossing, 30M+ visits combined). Designed robust data-management systems for in-game inventories to support seamless integration, high reliability, and future expandability for live environments. Delivered high-quality solutions across diverse client requirements by quickly adapting to different codebases and project scopes.

Remote Game Developer at Voldex

January 1, 2022 - September 1, 2022

Maintained and updated Base Battles (120M+ visits, 6,000+ concurrent players), integrating new features, optimizing modules, and ensuring system reliability. Created Build a Market Tycoon (20M+ visits, 4,500 concurrent players), designing object-oriented simulation frameworks and high-speed data systems for complex dynamic gameplay. Developed advanced user interfaces, analytics, and web API integrations to support seamless communication and data processing.