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I'm Grzegorz Górnisiewicz, a Senior Unity Developer with over 10 years of hands-on experience building mobile apps and games for Android and iOS, with a strong focus on AR and gamified user experiences. I design, implement, and optimize Unity-based solutions, collaborating with UX/UI designers and backend teams to deliver polished products with solid performance. I'm passionate about turning complex requirements into reliable software, improving production stability, and maintaining high code quality across the entire lifecycle of applications. I have successfully boosted AR performance (up to about 400% in AR mode) and have deep experience with AR Foundation, ARKit, ARCore, and Vuforia, as well as performance profiling, memory and GC optimization, and scalable architecture.…I'm Grzegorz Górnisiewicz, a Senior Unity Developer with over 10 years of hands-on experience building mobile apps and games for Android and iOS, with a strong focus on AR and gamified user experiences. I design, implement, and optimize Unity-based solutions, collaborating with UX/UI designers and backend teams to deliver polished products with solid performance. I'm passionate about turning complex requirements into reliable software, improving production stability, and maintaining high code quality across the entire lifecycle of applications. I have successfully boosted AR performance (up to about 400% in AR mode) and have deep experience with AR Foundation, ARKit, ARCore, and Vuforia, as well as performance profiling, memory and GC optimization, and scalable architecture.

Grzegorz Górnisiewicz

Game Developer, Programmer, Designer, +5

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I'm Grzegorz Górnisiewicz, a Senior Unity Developer with over 10 years of hands-on experience building mobile apps and games for Android and iOS, with a strong focus on AR and gamified user experiences. I design, implement, and optimize Unity-based solutions, collaborating with UX/UI designers and backend teams to deliver polished products with solid performance. I'm passionate about turning complex requirements into reliable software, improving production stability, and maintaining high code quality across the entire lifecycle of applications. I have successfully boosted AR performance (up to about 400% in AR mode) and have deep experience with AR Foundation, ARKit, ARCore, and Vuforia, as well as performance profiling, memory and GC optimization, and scalable architecture.…I'm Grzegorz Górnisiewicz, a Senior Unity Developer with over 10 years of hands-on experience building mobile apps and games for Android and iOS, with a strong focus on AR and gamified user experiences. I design, implement, and optimize Unity-based solutions, collaborating with UX/UI designers and backend teams to deliver polished products with solid performance. I'm passionate about turning complex requirements into reliable software, improving production stability, and maintaining high code quality across the entire lifecycle of applications. I have successfully boosted AR performance (up to about 400% in AR mode) and have deep experience with AR Foundation, ARKit, ARCore, and Vuforia, as well as performance profiling, memory and GC optimization, and scalable architecture.

Available to hire

I’m Grzegorz Górnisiewicz, a Senior Unity Developer with over 10 years of hands-on experience building mobile apps and games for Android and iOS, with a strong focus on AR and gamified user experiences. I design, implement, and optimize Unity-based solutions, collaborating with UX/UI designers and backend teams to deliver polished products with solid performance.

I’m passionate about turning complex requirements into reliable software, improving production stability, and maintaining high code quality across the entire lifecycle of applications. I have successfully boosted AR performance (up to about 400% in AR mode) and have deep experience with AR Foundation, ARKit, ARCore, and Vuforia, as well as performance profiling, memory and GC optimization, and scalable architecture.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

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Expert

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Expert

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Expert

Expert

Expert

Expert

Expert

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Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Polish

Fluent

English

Advanced

Work Experience

Freelance Software Developer (Unity, AR, Games, IoT, Mobile) at Freelancer

January 1, 2010 - Present

Led the development of multiple projects including games, AR apps, and mobile apps. Worked closely with clients to understand needs and deliver high-quality, market-driven solutions with a focus on emerging technologies. Collaborated with cross-functional teams to ensure seamless integration of AR, IoT and backend systems. Managed technical aspects of product development, ensuring alignment with business objectives and technical feasibility.

iOS Developer, IoT Specialist (Contract) at Locky sp. z o.o.

October 1, 2017 - January 31, 2019

Developed the iOS application for Locky IoT devices, focusing on seamless user interaction and efficient communication with the hardware. Designed and implemented a communication system between the mobile app and IoT devices using Firebase Realtime Database and BLE, enabling real-time data exchange and robust device connectivity. Integrated BLE protocols to ensure secure and energy-efficient communication between the app and IoT devices, optimizing user experience and system performance. Collaborated with Android developers to align cross-platform functionality and maintain consistent integration with Locky IoT devices. Implemented new firmware features for the NR52832 chip. Contributed to the development of a patented solution (PL236117B1), enhancing system reliability in detecting and monitoring the locking state of smart locks.

Senior Unity Developer / Senior Software Engineer at Self-employed / Contractor

January 1, 2010 - Present

Design, development, and optimization of Unity-based mobile applications and mobile games; implementation of game mechanics and gamification features; AR applications using AR Foundation, ARKit, ARCore, and Vuforia; integration with external systems, loyalty systems, and backend APIs; performance profiling and memory optimization; maintaining high code quality and maintainable code using software design patterns; collaboration with UX/UI designers, product managers, and QA teams; ongoing problem solving and stability improvements across production applications.

Senior Unity Developer at ViSULiZR (UK)

January 1, 2019 - January 1, 2025

Commercial mobile AR application for retail visualization; integrated Unity with external UI and backend systems; collaboration with UX/UI designers across iterations; performance profiling and optimization of rendering and integration layers; achieved up to ~400% AR performance improvement.

Unity Developer at Hololoot AR

March 1, 2023 - May 31, 2023

Mobile AR app development with gamified interaction mechanics and UI overlays; integration with external systems and APIs; deployed to Android and iOS.

Unity Developer at Nuwa AR

October 1, 2022 - September 30, 2023

AR interaction systems, R&D features; integration with backend services and external APIs; UI implementation and performance considerations for mobile devices.

Unity Developer at Kings of Poland

January 1, 2025 - Present

Educational mobile application with gamified presentation of historical content; card-based UI and user engagement mechanics; Android deployment.

Unity Developer at Words Fest

September 1, 2024 - Present

Mobile gamified learning application; integration of external services, including AI-generated speech; end-to-end development and release on Android.