Innovative Gameplay Designer & Programmer with over 35 years of experience. FPS Specialist in Gameplay Design such as new gametypes, gamemodes, features, balance, AI behavior (bots) and anything else related to gameplay. Very creative and innovative. Problem Solver.
Over 30 years working with FPS since Wolfenstein 3D with experience in many different Engines but with greater expertise in Quake based Engines, such as GoldSource, Source, Medal of Honor, Call of Duty & several ID Techs, aside also worked with Unreal 1, 2, 3 and working with Unreal Engine 5 since 2022. Over 17 years working with Call of Duty. Creator of the award-winning Call of Duty Frontlines & Call of Duty Rio.
Some of Shipped AAA Games with my Creations/Work:
- 2008 Call of Duty: World at War
- 2009 Call of Duty Modern Warfare 2
- 2010 Call of Duty: Black Ops
- 2010 Battlefield: Bad Company 2
- 2010 Battlefield: Bad Company 2: Vietnam
- 2011 Call of Duty: Modern Warfare 3
- 2011 Battlefield 3
- 2011 Payday: The Heist
- 2012 Call of Duty: Black Ops II
- 2013 Call of Duty: Ghosts
- 2013 Battlefield 4
- 2014 Call of Duty: Advanced Warfare
- 2015 Call of Duty : Online
- 2015 Call of Duty: Black Ops III
- 2015 Star Wars Battlefront
- 2016 Call of Duty: Modern Warfare Remastered
- 2016 Call of Duty: Infinite Warfare
- 2016 Battlefield 1
- 2017 Call of Duty: WWII
- 2017 Fortnite
- 2018 Call of Duty: Black Ops 4
- 2018 Battlefield V
- 2019 Call of Duty: Mobile
- 2019 World War Z
- 2019 Apex Legends
- 2019 Call of Duty: Modern Warfare
- 2020 Call of Duty Warzone
- 2020 Call of Duty: Black Ops Cold War
- 2021 Battlefield 2042
- 2021 Call of Duty: Vanguard
- 2022 Call of Duty Modern Warfare II
- 2023 Call of Duty Warzone 2.0
- 2023 Call of Duty Modern Warfare III
Freddy has designed, developed and perfected countless innovations in FPS games over the past decades, such as Help Mode, Medic System, Parachutes, Forever Concept, War Server, Intelligent Server, dozens of new game types and many other famous innovations in the FPS world. To the point that it is very difficult to find FPS/TPS games released after 2008 without something created, developed or perfected by him.
Hajas is now developing his first full commercial game in Unreal Engine 5. Comando Rio is the sequel to Call of Duty Rio, and will be the basis for AfterImpaKt, an extremely bold and innovative project on hold for now.
To finance his projects, he has been doing a wide variety of work for several studios in Brazil and around the world, including the already famous Betagames Group’s 171, better known as the “Brazilian GTA”. Check the portfolio below for details about each project/work.
Our Work
FROM THE PORTFOLIO
Modding
Freddy started working with games as a Modder, and worked side by side with several other Modders throughout his renowned career. Many of them became references in game development, and pretty much all of them have been by his side since the PlanetQuakedays.
Some examples of extremely successful Modding work in the gaming industry: Quake 3 Arena, Team Fortress, Unreal, Tactical Ops, Half-Life, Counter-Strike, Medal of Honor, Call of Duty, Playerunknown’s Battlegrounds, DOTA 2, among many others. The Unreal Engine itself was created primarily by Modders.

In this link above you can find a brief summary of his history in Modding.