Dear Hiring Manager, I am a Senior Unity Engineer with more than six years of experience developing, optimizing, and maintaining interactive applications and video games across multiple platforms. My primary expertise is in Unity and C#, with additional experience integrating native C/C++ SDKs, developing reusable systems, debugging complex platform-specific issues, and supporting production releases for Windows, Android, iOS, macOS, Linux, PlayStation, and Nintendo Switch. In my most recent role, I worked on Epic Online Services for Unity, contributing to multiple public releases, implementing new SDK functionality, resolving critical integration and build issues, and validating compatibility across platforms and Unity versions. I also collaborated directly with engineers, studios, and users to diagnose technical incidents involving authentication, networking, IL2CPP, native plugins, Android builds, and cross-platform deployment. My previous experience includes leading Unity and XR development teams, defining technical architecture, mentoring developers, reviewing code, estimating features, coordinating with art, QA, product, and project management teams, and delivering VR, AR, simulation, and training applications for enterprise clients. I can contribute in areas such as: Gameplay and systems development using Unity and C#. Software architecture and reusable framework design. SDK, API, platform service, and native plugin integration. Multiplayer, online services, authentication, and networking. Performance optimization, debugging, and technical troubleshooting. Cross-platform builds, certification requirements, and release validation. Technical leadership, mentoring, code reviews, and production support. I am particularly interested in opportunities where I can combine hands-on development with technical ownership and help deliver stable, scalable, and engaging player experiences. Thank you for considering my application. I would welcome the opportunity to discuss how my Unity, game development, SDK integration, and cross-platform experience could contribute to your team.

Jessica Esmeralda Tello Arrendondo

Dear Hiring Manager, I am a Senior Unity Engineer with more than six years of experience developing, optimizing, and maintaining interactive applications and video games across multiple platforms. My primary expertise is in Unity and C#, with additional experience integrating native C/C++ SDKs, developing reusable systems, debugging complex platform-specific issues, and supporting production releases for Windows, Android, iOS, macOS, Linux, PlayStation, and Nintendo Switch. In my most recent role, I worked on Epic Online Services for Unity, contributing to multiple public releases, implementing new SDK functionality, resolving critical integration and build issues, and validating compatibility across platforms and Unity versions. I also collaborated directly with engineers, studios, and users to diagnose technical incidents involving authentication, networking, IL2CPP, native plugins, Android builds, and cross-platform deployment. My previous experience includes leading Unity and XR development teams, defining technical architecture, mentoring developers, reviewing code, estimating features, coordinating with art, QA, product, and project management teams, and delivering VR, AR, simulation, and training applications for enterprise clients. I can contribute in areas such as: Gameplay and systems development using Unity and C#. Software architecture and reusable framework design. SDK, API, platform service, and native plugin integration. Multiplayer, online services, authentication, and networking. Performance optimization, debugging, and technical troubleshooting. Cross-platform builds, certification requirements, and release validation. Technical leadership, mentoring, code reviews, and production support. I am particularly interested in opportunities where I can combine hands-on development with technical ownership and help deliver stable, scalable, and engaging player experiences. Thank you for considering my application. I would welcome the opportunity to discuss how my Unity, game development, SDK integration, and cross-platform experience could contribute to your team.

Available to hire

Dear Hiring Manager,
I am a Senior Unity Engineer with more than six years of experience developing, optimizing, and maintaining interactive applications and video games across multiple platforms.
My primary expertise is in Unity and C#, with additional experience integrating native C/C++ SDKs, developing reusable systems, debugging complex platform-specific issues, and supporting production releases for Windows, Android, iOS, macOS, Linux, PlayStation, and Nintendo Switch.
In my most recent role, I worked on Epic Online Services for Unity, contributing to multiple public releases, implementing new SDK functionality, resolving critical integration and build issues, and validating compatibility across platforms and Unity versions. I also collaborated directly with engineers, studios, and users to diagnose technical incidents involving authentication, networking, IL2CPP, native plugins, Android builds, and cross-platform deployment.
My previous experience includes leading Unity and XR development teams, defining technical architecture, mentoring developers, reviewing code, estimating features, coordinating with art, QA, product, and project management teams, and delivering VR, AR, simulation, and training applications for enterprise clients.
I can contribute in areas such as:
Gameplay and systems development using Unity and C#.
Software architecture and reusable framework design.
SDK, API, platform service, and native plugin integration.
Multiplayer, online services, authentication, and networking.
Performance optimization, debugging, and technical troubleshooting.
Cross-platform builds, certification requirements, and release validation.
Technical leadership, mentoring, code reviews, and production support.
I am particularly interested in opportunities where I can combine hands-on development with technical ownership and help deliver stable, scalable, and engaging player experiences.
Thank you for considering my application. I would welcome the opportunity to discuss how my Unity, game development, SDK integration, and cross-platform experience could contribute to your team.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
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Language

Spanish; Castilian
Fluent
English
Advanced

Work Experience

Senior Game Engineer Project Leader / Unity Developer (Industrial Training VR) at Apex Systems / Client: Epic Games
February 1, 2025 - July 1, 2026
Developed industrial training virtual environments using Unity 3D. Delivered and maintained efficient, reusable, reliable C# code across multiple platforms, including Unity/Unreal VR and web/desktop/mobile. Implemented Scrum, task management via Atlassian Jira/Azure DevOps, and applied SOLID principles and MV C design patterns. Owned and maintained the Epic Online Services Unity plugin, integrating SDK updates and validating compatibility across supported platforms. Built and supported cross-platform SDK integration (Windows, macOS, Android, iOS, Linux, Switch). Debugged complex native plugin issues involving DX12, IL2CPP/Mono, authentication, and platform dependencies. Optimized Unity build pipelines using refactoring, GitHub Actions, and cloud code. Delivered five production releases in 14 months and provided technical support and integration guidance across Unity LTS versions, including documentation, root-cause analysis, fixes, and developer enablement.
Senior Game Engineer / Project Leader (Epic Online Services Unity Plugin) at Apex Systems / Client: Epic Games
February 1, 2025 - July 1, 2026
Developed industrial training virtual environments using Unity/Unreal workflows, with reusable and reliable C# code. Owned and maintained the Epic Online Services (EOS) Unity plugin, integrating EOS SDK updates into the plugin repository and validating compatibility across supported platforms. Implemented cross-platform SDK integration for Windows, macOS, Android, iOS, Linux, and Switch. Built and supported reusable C# and C++ SDK libraries and Unity integration workflows. Debugged complex issues involving DX12, native plugins, IL2CPP/Mono, authentication, and platform dependencies. Optimized build pipelines using refactoring, GitHub Actions, and Cloud Code; delivered 5 production releases in 14 months. Provided technical support for studios integrating the EOS plugin across Unity LTS versions, including technical documentation and developer integration guidance; investigated issues, performed root-cause analysis, fixes, and technical guidance.
Senior Game Engineer / Epic Online Services Unity Plugin Owner at Apex Systems (Client: Epic Games)
February 1, 2025 - July 1, 2026
Owned and maintained the Epic Online Services (EOS) Unity plugin. Integrated EOS SDK updates into the plugin repository and validated compatibility across supported platforms. Built cross-platform SDK integration for Windows, macOS, Android, iOS, Linux, and Switch, and developed/reinforced reusable C# and C++ libraries with Unity integration workflows. Debugged complex issues involving DX12, native plugins, IL2CPP/Mono auth, and platform dependencies. Optimized build pipelines using refactoring, GitHub Actions, and Azure/CodePipeline-style tooling. Delivered multiple production releases, provided technical support for studios integrating the EOS plugin across Unity LTS versions, and created technical documentation and integration guidance. Investigated developer-reported issues with root-cause analysis, fixes, and technical guidance. Specialized in SDK integration, cross-platform development, native plugin debugging, build automation, and XR/game systems.
Senior Game Engineer Project Leader at Apex Systems / Client: Epic Games
February 1, 2025 - July 1, 2026
Led and developed an Epic Online Services Unity plugin, including ownership and maintenance. Integrated EOS SDK updates into the Unity plugin repository and validated compatibility across supported platforms. Built cross-platform SDK integration for Windows, macOS, Android, iOS, Linux, and Switch. Developed and supported reusable C# and C++ SDK libraries and Unity integration workflows. Debugged complex issues involving DX12, native plugins, IL2CPP/Mono authentication, and platform dependencies. Optimized Unity build pipelines using refactoring, GitHub Actions, and Azure services (e.g., CI/CD). Delivered multiple production releases within tight timelines and provided technical support and documentation for studios integrating the EOS plugin across Unity LTS versions.
Unity Developer (Unreal/Unity VR platform development) at Yeltic
January 1, 2024 - January 1, 2025
Unity Developer / XR / Industrial Training (Scrum, MVC, UML) at Yeltic
January 1, 2024 - January 1, 2025
Developed and maintained industrial training virtual environments and XR/VR-related Unity projects. Worked on implementation and maintenance of efficient, reusable, reliable C# code. Developed platforms including Unity and Unreal VR, Web Graphics Library, mobile devices (Android/iOS), and desktop applications. Implemented Scrum methodology and task management via Azure DevOps; applied MVC design pattern; maintained detailed project documentation using UML.
Unity Developer / Senior Game Engineer at Yeltic
January 1, 2024 - January 1, 2025
Worked as a Unity developer on XR/real-time application projects, contributing to C# development, Unity integrations, and engineering support tasks.
Unity Developer at Yeltic
January 1, 2024 - January 1, 2025
Software Developer at Fyware
January 1, 2021 - October 1, 2023
Software Developer (Unity/XR/Industrial Training) at Fyware
January 1, 2021 - October 1, 2023
Continued development of industrial training virtual environments using Unity 3D and contributed to XR-focused workflows. Supported programming, asset integration, and maintenance of reusable, reliable C# code. Delivered work using agile practices (Scrum) and maintained task tracking in Azure DevOps.
Unity / Software Developer at Fyware
January 1, 2021 - October 1, 2023
Continued development and maintenance of industrial training virtual environments in Unity 3D, including XR application development concepts, code optimization, documentation standards, and iterative Scrum delivery. Supported cross-platform development practices and ongoing project maintenance.
Unity Developer
January 1, 2020 - December 31, 2020
Development of industrial training virtual environments in Unity 3D; included design, development, optimization, and maintenance of efficient, reusable, and reliable C# code for VR/XR and related platforms. Implemented development processes using Scrum and SOLID principles, maintained documentation standards, optimized Unity tooling/workflows, and managed industrial project structure and team collaboration.
Software Developer at Fyware
December 1, 2019 - January 1, 2021
Software Developer (Unity/XR/Industrial Training) at Fyware
December 1, 2019 - January 1, 2021
Worked on industrial training and XR experiences using Unity 3D, and also contributed to Unreal project development including programming and asset integration. Designed and maintained efficient, reusable, reliable C# code. Contributed to development across multiple platforms including Unity/Unreal VR, Web Graphics Library, mobile (Android/iOS), and desktop applications. Applied Scrum methodology and used Azure DevOps for task management.
Senior Game Engineer Project Leader at Fyware
December 1, 2019 - October 1, 2021
Developed industrial training virtual environments using Unity 3D and Unity/Unreal VR pipelines, focusing on efficient and reliable C# code. Implemented Scrum and MVC/UML documentation practices, maintained reusable code standards for engineering teams, and applied Unity optimization tools. Planned and structured industrial projects, managed task workflows with Jira/Azure DevOps, and supported periodic reviews. Built and maintained XR applications for devices such as Oculus Quest/Quest2, Rift, HTC Vive, and HoloLens; included realistic lighting manipulation and updates of animations, plus UI/UX design and development.
Unity / Software Developer at Fyware
December 1, 2019 - January 1, 2021
Developed industrial training virtual environments using Unity 3D. Worked on XR-related projects and platform development using Unity/Unreal workflows, asset integration, and reliable C# code. Implemented reusable code patterns and followed Scrum. Managed tasks using Azure DevOps and supported documentation practices (e.g., UML). Applied optimization tools in Unity and maintained existing systems.

Education

Mechanical Engineering at Universidad Autónoma de San Luis Potosí, Campus Zona Media
August 1, 2014 - May 1, 2019
Mechatronics Engineering at Universidad Autónoma de San Luis Potosí (Campus Zona Media)
August 1, 2014 - May 1, 2019
Mechatronics Engineering at Universidad Autónoma de San Luis Potosí (Campus Zona Media)
August 1, 2014 - May 1, 2019
Mechatronics Engineering at Universidad Autónoma de San Luis Potosí (Campus Zona Media)
August 1, 2014 - May 1, 2019

Qualifications

Native Intermedio B2-C1
January 11, 2030 - August 1, 2026

Industry Experience

Software & Internet, Gaming, Computers & Electronics, Manufacturing, Media & Entertainment, Education