Senior Engineer

Freelancer Opportunity Job title: Senior Detection Engineer / Threat Detection Lea dJob location: Brussels, Hybrid, 2 days/wee kJob sector: Financial Services / Critical Infrastructur eLevel: Senior / Lead (NL, EN, FR), leading people & project sJob duration: 2026-08-01 to 2027-02-2 8Job weekly hours: 40 hrs./wee kJob salary range: 95 to 100 euros an hou r About the Ro leWe are looking for an experienced security professional to lead our threat detection capabilities. This is a hands-on role with real ownership: you will design detections that actually catch attackers, drive our threat hunting programme, and be a go-to person for continuous security improvement. You will also have the opportunity to contribute to the broader security community and help build a team around yo u. What You Will • DoDesign, build, and maintain detection rules across SIEM and XDR platforms, with full lifecycle ownership from use case to retirem • entConduct gap analyses against threat actor TTPs (MITRE ATT&CK) to identify coverage blind sp • otsParticipate in and lead incident response efforts, including containment, investigation, and remediat • ionRun purple team exercises and breach & attack simulations to validate detection cover • ageBuild and maintain a Detection-as-Code framework with CI/CD pipelines and version cont • rolDevelop and execute threat hunting hypotheses based on threat intelligence and new attack resea • rchTranslate threat intelligence feeds and reports into actionable detecti • onsSupport red team, TIBER, and DORA testing as the blue team counterp • artContribute to incident response plan development and tabletop exerci • sesShare knowledge internally and represent the company in relevant industry groups (ISACs, CSIRTs, working grou ps) What We Are Looking • ForSeveral years of hands-on experience in detection engineering, SOC, or CSIRT r • olesDeep familiarity with SIEM platforms (Sentinel, Splunk, QRadar, or simi • lar)Experience building and running SOAR playbooks and automation pipel • inesSolid understanding of attacker TTPs and how to operationalize threat intellig • enceExperience with forensics, threat hunting, and incident handling at L2/L3 l • evelAbility to lead a team or a functional working g • roupActive participation in the security community is a strong differenti • atorTrilingual candidate (NL, EN, FR). Nice to • HaveExperience in Government, defense, financial sector environments or critical infrastru • ctureFamiliarity with OT/ICS sec • urityPython scripting for automation and to • olingInvolvement in inter-CSIRT coordination or security coali • tionsCertifications: Microsoft Security, Threat Hunting, Threat intel, CISM, CISSP Why Thi s RoleThis role is built for someone who has grown from SOC analyst to detection leader, who reads detection engineering reports for fun, and who thinks in terms of attacker behavior rather than just alert rules. If you have run a CSIRT team at a major bank, contributed to a national cyber coalition, and spoken at FIRST, this is the kind of work you will find worth showing u p for. Apply now and start your journey with Team Possible! We want to get to kn ow you.After your application, we will verify your profile and get back to you w ithin 3workin g days. If you’re successful, you can expect the followin g steps:An initial conversation with our recruiter - Swat i KumariInterview with the Hiring Manager and t he team.Final decision About ProximusWe are Team Possible turning tech into oppor tunities.We are driven by four core pillars: "I care," "I make a difference," "I radically simplify," and "I embrace the future". This means you'll join a team that genuinely cares for customers and colleagues, is empowered to make a real impact, strives to radically simplify complex challenges, and is always looking ahead to embrace the future of technology. We believe in an inclusive and safe environment where everyone can thrive, offering extensive career development resources, including access to over 5,000 training modules and a minimum of 5 days of training per year, to help you continuously learn, grow, and tackle bold challenges with us.