Application Security Expert

Application Security Expert Flexible, Hasselt Application Security Expert Apply Do you like to conduct application penetration testing and identify vulnerabilities? Would you like to proactively perform threat modeling for new and existing applications? • Application Penetration Testing: You will perform manual and automated application penetration testing against web applications, APIs and mobile applications to identify vulnerabilities, business logic flaws and chained attack vectors • Threat Modeling: You will lead threat modeling sessions, using methodologies like STRIDE and PASTA to identify, analyze and prioritize threats in application architectures • Security Assessments: You will conduct comprehensive application architecture, source code reviews and vulnerability assessments to validate security controls • Remediation Guidance: You will collaborate with developers and product teams to explain complex vulnerabilities, provide actionable remediation guidance and verify security fixes • Detection Engineering: You will provide our Detection Engineering team with propositions for the development of detection logic to increase coverage of our application security monitoring practice • Tooling: You will leverage penetration testing tools (Burp Suite Pro, OWASP ZAP, …) and develop scripts (Python, Bash, …) to automate testing tasks and improve efficiency. You will develop data flow diagrams (MS Threat Modeling Tool, OWASP Threat Dragon, …) and research new application security solutions to add to our toolkit. • You work collaboratively with cross-functional teams (developers, application owners, managers, …) in a fast-paced environment • You have excellent written and verbal communication skills in English and Dutch. • You preferably work two days per week from our office in Hasselt (Universiteitslaan), combined with working from home. What are we offering: • You will be joining a true Top Employer • Year after year, Whitelane Research confirms Cegeka's position as a reliable and leading IT services partner. In 2026, we achieved first place in Security Services for the fourth consecutive year, and a shared second place in both Cloud & Infrastructure Services and Network & Connectivity • We ask a lot of (talents) from you. Fortunately, you also get a lot in return! Competence and character are essential to us, in addition to experience and ambitions. Cegeka continuously invests in talent management so that every employee can realize their potential • We use a framework aimed at fair compensation, ensuring employees are paid based on their role, experience, and performance, regardless of gender or other non-job-related characteristics. An electric car with charge card or a mobility budget, meal vouchers, eco vouchers, an interesting group and hospitalization insurance, a mobile phone subscription, a fixed expense allowance, a powerful laptop and the option to give your salary package your own accent thanks to our Flex Reward Plan • Flexible working hours and a nice work/life balance • A top team: in which new fresh ideas and initiatives are always welcome! Team events, happy hours and an increasingly legendary company party are also part of this • Continuous learning: knowledge sharing meetings, participation in conferences and external training. Knowledge sharing and learning are key! Depending on your own interests and initiatives, Cegeka offers various horizontal and vertical career paths • We value sustainability by pursuing carbon neutrality with the electrification of our fleet and an environmentally friendly data center. We develop innovative solutions with a positive impact on the environment, people and society, and strive for an inclusive and diverse work environment where everyone is valued and heard • Would you like to join us as a freelancer? Then we offer you a market-conform daily rate and a range of benefits. Continuous learning via hackathons, innovation centers, events,... Flexible working hours supporting your work/life balance. Career growth with horizontal and vertical development paths. Personal guidance from managers, coaches, and sparring partners. Cegeka proudly holds the Top Employer certificate. Team events, happy hours, sports events, and epic company festival. Application flow Do you have any questions about this role? Let's connect.