Jeroen Gui
Jeroen Gui is the founder of JustGuard, a company he started in August 2023, and is based in Leuven. His stated areas of expertise are cyber threat intelligence, cybersecurity, IT security operations, entrepreneurship and business development.
He worked at Easi in blue team research and development during two periods in 2025, in June and July and again in October and November. From August 2023 to January 2024 he was an ethical phisher at OutKept. Earlier, he held several roles at Wina Leuven between 2021 and 2023, working as a system administrator and web developer and serving on the first-year welcoming committee, which he led as team leader from July 2022. In 2020 he was an information technology sales consultant at Elektromic NV, and in October 2019 he represented Belgium as a Euroscola student representative at the European Parliament.
Gui followed the Latijn-wiskunde track at Sint Dimpna Geel College, then took a bachelor's degree in computer science at KU Leuven, where he is also enrolled in a master's in information management.
Career
JustGuardFounderAug 2023 – Present
Easi#78factoryCyber Security Student SOC | Blue Team R&D (part 2)Oct 2025 – Nov 2025
OutKeptEthical PhisherAug 2023 – Jan 2024
- Wina LeuvenTeam leader First-Year Welcoming committeeJul 2022 – Jun 2023
- Wina LeuvenSystem administrator, Web developerJul 2021 – Sep 2022
- Wina LeuvenFirst-Year Welcoming CommitteeJul 2021 – Jun 2022
- Elektromic NVInformation Technology Sales ConsultantMay 2020 – Sep 2020
- European Parliament#140factoryEuroscola student representative BelgiumOct 2019 – Oct 2019
From public career histories · 12 entries