Summary
Overview
Work history
Education
Skills
Websites
Languages
Certification
Affiliations
Timeline
Generic

Josef Loš

Prague

Summary

Dependable and dedicated developer with 9 years of experience in AAA industry. Successful at managing multiple priorities with positive attitude and great attention to detail. Knowledgeable about game development processes.

Overview

12
12
years of professional experience
2013
2013
years of post-secondary education
1
1
Certification

Work history

Unannounced Project #2

Warhorse Studios
2026.01 - Current

- Combat

Unannounced Project #1

Warhorse Studios
2025.06 - Current

- Reviewing early script and design.

- Providing feedback on early ideas.

Senior QA Engineer (KCD 2 - Royal Edition)

Warhorse Studios
Prague
2025.03 - 2025.12
  • Ensured quests reached alpha and beta stages.
  • Detected bugs through manual testing, automated testing, cooperation with external teams, other internal procedures (evaluations).
  • Analyzed technical design (script) and design of quests and features.
  • Identified thousands of issues and proposed solutions/improvements.
  • Maintained and wrote documentation.
  • Guided team members.
  • Improved the game by debugging (via in-game console and LUA) issues of all sorts (RPG, AI, budgets, labels, areas, settlement, quest logic, user experience, combat).
  • Examined reports and tickets of other team members.

Senior/Lead Tester (Kingdom Come: Deliverance 2)

Warhorse Studios
Prague
2019.08 - 2025.11
  • I was responsible for the quality and release of the whole Crime 2.0 system; managed a team of 4 QA members (organized weekly meetings, assigned day to day work, provided consultations).
  • Analyzed AI behaviors.
  • Wrote quest documentation.
  • Created evaluation and checklist workflows.
  • Documented debugging methods and know-how.
  • Closely communicated with feature teams, owners and directors.
  • Created over 4000 tickets (bugs, suggestions and improvements) in Youtrack.
  • Assisted with the design of various sub-features, AI behaviors, barks and quest design.
  • Served as a member of a special reviewing group.
  • Identified potential risks and weaknesses (on-boarding, imbalance, user experience, unexplained and underdeveloped narratives).

QA Tester (KCD 1 - Royal Edition)

Warhorse Studios
Prague
2018.03 - 2019.10
  • Led a small group of 3 testers (DLC 4 - Woman's Lot/Theresa part). Assigned, oversaw and consulted work on a regular basis.
  • Ensured that various side and main quests reached the best quality.
  • Communicated with customers and examined their issues and reports.

QA Tester (Kingdom Come: Deliverance)

Warhorse Studios
Prague
2017.03 - 2019.07
  • Trained new members and interns.
  • Conducted frequent design/script reviews.
  • Documented testing procedures.
  • Helped to develop test plans and ideas to ensure better quality and workflow.
  • Detected bugs of all priorities.
  • Brainstormed design ideas.
  • Collaborated closely with developers to identify and resolve issues swiftly.
  • Uncovered bugs and defects.
  • Wrote reports about the quality of quests/features.
  • Improved the game's quality by reporting thousands of issues and made sure fixes worked.
  • Suggested thousands of improvements and ideas.
  • Prepared builds for internal meetings.

Production Director, Lecturer, Guide

National Marionette Threatre
Prague
2013.12 - 2017.05
  • Oversaw company's puppet shows.
  • Conducted puppet building workshops and guided backstage/museum tours.

Education

High School Diploma - ICT and business

Hermés MB s. r. o.
Mladá Boleslav
/2007 - 2011.06

Unfinished - Czech Language and Literature

UJEP
Ústí nad Labem
2012.08 - 2013.09

Skills

  • Problem-solving
  • Critical analysis
  • Attention to Detail
  • Strategic planning
  • Knowledge of Unreal, CryEngine

Languages

English
Advanced (C1)

Certification

TELC English B2

Affiliations

  • Video games, video gaming history, video game collecting, universe, geopolitics

Timeline

Unannounced Project #2

Warhorse Studios
2026.01 - Current

Unannounced Project #1

Warhorse Studios
2025.06 - Current

Senior QA Engineer (KCD 2 - Royal Edition)

Warhorse Studios
2025.03 - 2025.12

Senior/Lead Tester (Kingdom Come: Deliverance 2)

Warhorse Studios
2019.08 - 2025.11

QA Tester (KCD 1 - Royal Edition)

Warhorse Studios
2018.03 - 2019.10

QA Tester (Kingdom Come: Deliverance)

Warhorse Studios
2017.03 - 2019.07

Production Director, Lecturer, Guide

National Marionette Threatre
2013.12 - 2017.05

Unfinished - Czech Language and Literature

UJEP
2012.08 - 2013.09

High School Diploma - ICT and business

Hermés MB s. r. o.
/2007 - 2011.06
Josef Loš