Arnold Marcelo Guzmán Concha, Developer in Oruro, Oruro Department, Bolivia
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Arnold Marcelo Guzmán Concha

Verified Expert  in Engineering

Game Developer

Oruro, Oruro Department, Bolivia
Toptal Member Since
March 16, 2017

Arnold is a passionate game developer, and that's why he loves and appreciates the creation and design of pieces of software that show you pixels in amazing ways and makes you remember good experiences and feelings. He mainly develops in Unity 3D with C# and is an active member of the game development community. Arnold has a background in developing .NET and mobile applications, and he also does front-end development for web pages.



Preferred Environment

VR Platform, Games, Unity, C#, Blender, Unity3D

The most amazing... I've done was to code a small, touristic exploration game that shows Uyuni's Salar and a few towns in my country, Bolivia.

Work Experience

CEO | Founder | Programmer | Game Designer | Artist

2015 - PRESENT
Ancestral Gods
  • Programmed many browser and Unity3D-based games.
  • Created assets and 3D art in Blender.
  • Managed the project and led the team for game development.
  • Designed games and levels.
Technologies: HTML Canvas, JavaScript, Blender, C#, Unity3D

AR Developer

2020 - 2020
Save the Children - Bolivia
  • Configured QR and image markers in Vuforia for physical books with several scenes.
  • Designed visual 3D models and incorporated narrated audio made for children.
  • Organized the product shipment between the 3D artist, the voice actor, and the client.
Technologies: Unity 3, Augmented Reality (AR), 3D Modeling

Unity Developer — Mobile Games

2019 - 2020
Rokit Games (via Toptal)
  • Maintained, developed, and prototyped mobile games using Unity technologies.
Technologies: Unity3D

Freelance VR Developer

2018 - 2019
Divertica (via Toptal)
  • Created a user interface for a VR application.
  • Developed a video-streaming-based experience for virtual reality (VR).
  • Implemented 3D modeling, texturing, and optimization.
Technologies: Oculus Go, Oculus Rift, Unity3D

Freelance Game Developer

2018 - 2018
EZ Consulting (via Toptal)
  • Ported a card-based game to new Unity3D technologies.
  • Created a asynchronous turn-based game using Firebase.
Technologies: Networking, Unity3D

Freelance Game Developer

2018 - 2018
Appside (via Toptal)
  • Conducted research for a streaming feature in a 3D game with Unity and C#.
  • Created a proof-of-concept for streaming a game in one mobile device and seeing the stream live on several other devices (or PCs).
Technologies: C#, Unity, Unity3D

Freelance Game Developer

2017 - 2017
Mov Mobile (via Toptal)
  • Maintained and improved HTML-based games for marketing purposes.
Technologies: JavaScript, HTML5

Freelance Unity Developer

2017 - 2017
Highwai (via Toptal)
  • Created a small city with day/night changes and realistic illumination.
  • Configured the behavior of pedestrians and cars in order to respond to street lights with accurate car physics scripts.
Technologies: C#, Unity

Video Game Development Instructor

2016 - 2016
  • Taught computer science basics through video games using Scratch to kids and teenagers.
  • Taught video game fundamentals using Unity3D.
  • Was introduced to 3D modeling with Blender.
Technologies: Blender, Unity3D, Scratch

UI/UX Consultant | Web Developer

2015 - 2015
Boliviana de Aviación
  • Created the layout design of the landing and information pages.
  • Communicated through a REST-based services to show flights availability with prices and show dynamic results in order to make passenger registration.
Technologies: JavaScript, CSS, HTML

Web and Mobile Developer

2011 - 2014
  • Supported the content creation and administration of the customer web pages using Joomla and WordPress.
  • Created small puzzle games made with JavaScript embedded in Facebook, for supporting marketing campaigns.
  • Developed web-based product catalogs.
  • Remastered many old web user interfaces web using new HTML5 technology.
  • Created new themes in WordPress according to client's needs.
  • Made a virtual library of books using WordPress for an university.
  • Created and designed iPad turn-based, riddle, and general knowledge question games for onsite marketing campaigns.
Technologies: Mobile Apps, JavaScript, CSS, HTML

Mobile and Web Developer

2011 - 2014
  • Provided technical support for legacy desktop-based accounting applications.
  • Gave technical support for web-based applications and web pages made for several customers.
  • Designed and prototyped web interfaces for an application that allows finding restaurants nearby and with several filters.
  • Developed a small multipurpose framework in PHP for collecting data for web and mobile applications.
  • Built an Android app to fill information about restaurants, food types, localization, prices, and more.
Technologies: Android, JavaScript, CSS, HTML

Web Developer

2010 - 2013
Nerds on Site
  • Created web-based widgets to show CRM-related information.
  • Developed multipurpose services to support web-based interfaces to show several types of data from databases.
  • Researched and prototyped XMPP standard messaging protocol inside a CRM web-based application.
  • Researched and implemented Telerik's web libraries in dynamic web applications.
Technologies: HTML, CSS, JavaScript, C#


2007 - 2008
Piramide InformatiK SRL
  • Worked on unit testing research with Microsoft Tools.
  • Updated a portion of the user interface for medical x-ray modules.
  • Developed a service that allowed one to complete the metadata and resize images to be in standard format x-ray images.
Technologies: .NET

Camera Module Observer
This project involved building part of the camera control of a VR game called Dawn of Robots. The game allows you, as the observer, to see and move through fixed anchor points in space in the middle of a space station.

Dirty Mind
This is a game created for Global Game Jam 2015.

The main character is your brain! You have to decide what to do by searching for words and creating a simple phrase which is the thing to do next. According to this action, points of happiness, food, energy, and time are changed. Some of those actions could be a little bit weird, and some memes will appear according to what happened. The objective is to keep the mind as happy and healthy as possible.

Within this game, I've created my own small game engine using only JavaScript and no other library where I implemented simpler collision, control, and engine update characteristics.

Geo Memo
An exploration game that shows two touristic places in Bolivia: Uyuni's Salar and Cochabamba City.

This game was awarded with a prize from the US's embassy in Bolivia through its cultural department. It also has given a lot of interest to the local press.

During development, I implemented my own camera smoothing control and recreated a huge part of Bolivia using Google maps through terrain-based tools of Unity3D.

Dawn of Robots
A VR game which is still in the prototype phase.

This game is a 3D tower defense game in space stations, where you control the renegade robots and a central core IA. You have to avoid being disconnected by the humans.

Ñeqe Ñeqe
This is a RTS game developed for Global Game Jam 2016.

In this game, you have to survive through light sources and fireplaces, avoiding wild animals in the environment.

This project was implemented using navigation meshes and group selections. The characters were designed to mix typical "cholitas" of Bolivia and strange outer world characters.

Suri al Futuro

An RPG game which shows the adventure of a little girl and her dog to save her grandfather and also the lake where she lives using time travel mechanics.

This game was developed for the Environmental and Water Affairs Department (Ministerio de Medio Ambiente y Agua) of Bolivia's government in order to transmit the environmental message of caring about water.

Pacha Punk
A 2D game with Andean cultural references where you have to assure that te ancestral knowledge goes to the Earth through a satellite. For this purpose, the player has to gather many knowledge boxes and carry them to a satellite to improve lives on Earth.

Carrera por los Derechos

An educational platform/mobile video game made for Save the Children International. Two siblings (one in a wheelchair) learn how to protect their rights as children while collaborating to finish several challenges.

Game Card

A card game called HOKM that was built using Unity technology, using animation techniques and Firebase to become the game multiplayer per turns. The game was designed to be played by up to four players in an online room.

AR Developer

I led the development of an augmented reality (AR) app that tracks assets by taking photos and spherical images. My responsibilities included improving the software architecture in Unity and enhancing the user interface with reusable features, such as dynamic lists for displaying collected data.
2001 - 2006

Bachelor of Engineering Degree in Computer Science

Universidad Técnica de Oruro - Oruro, Bolivia


Git, Blender, GameSparks


Unity3D, Unity, Unity 3


C#, CSS, HTML, HTML5, JavaScript, Scratch


Agile Project Management, Mobile Game Design, Mobile Development


iOS, Android, Oculus Rift, Oculus, Firebase


Game Development, Full-stack Development, 3D Modeling, Virtual Reality (VR), Games, VR Platform, Mobile Apps, Networking, Oculus Go, 3D Animation, Game Design, HTML Canvas, Networks, Programming, Augmented Reality (AR)

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