**About us** **NTT DATA – a part of NTT Group - is a Top 10 global IT services provider, headquartered in Tokyo, with over 150,000 employees.** **We deliver consulting solutions** by combining specialized sectorial knowledge, our transformation management skills, and our large technology expertise (data, RPA, AI, low code, cloud, IoT, virtual reality), to keep our clients, as well as society, a step ahead in this digitally dynamic world. At NTT DATA everything we do is guided by our core values. We respect every **voice** , think **bold** , deliver the **outcome** and win **together** . Our leadership approach enables our people to feel **inspired** to contribute, **empowered** to take initiative, and genuinely **cared** for in their growth and wellbeing. We are looking for a **Mainframe System Administrator** to join our team in Brussels. **Your role:** As a Mainframe System Administrator, you will be responsible for managing, maintaining, and optimizing our mainframe environment. You will ensure the stability, security, and performance of critical business systems that are essential for our daily operations. Additionally, you will plan and oversee the system changes executed by our management partner. **Key Responsibilities:** + **System Administration:**  Oversee the installation, configuration, and maintenance of mainframe systems (z/OS, MVS), primarily focusing on planning, coordinating, testing, and monitoring, as installations are carried out by our management partner. + **Performance Monitoring:**  Monitor system performance and optimize resources. + **Backup & Recovery:**  Implement and manage backup and disaster recovery procedures. + **Security Management:**  Manage access rights and security protocols, assist with user management. + **Troubleshooting:**  Analyze and resolve technical issues. + **Support:**  Provide advice and assistance. + **Capacity Planning:**  Monitor system capacity and advise on expansions. + **Documentation:**  Maintain technical documentation and procedures. + **24/7 Support:**  Participate in on-call duties for critical incidents. **Why NTT DATA?** We value a **collaborative** and **supportive** environment, celebrating **curiosity** and **engagement** **Career development.** Training path and access to learning opportunities, yearly performance reviews and a mentorship program We believe in **work-life balance** and **flexibility** . Wear casual clothing, decide your working hours and enjoy our hybrid working model **Talent Friends.** Refer a friend and receive a bonus when they join **We care about you** **Health & well-being.** Focus on your mental health with access to a platform with certified psychologists & mental health workshops. Take a break with one of our online fitness and well-being sessions **Diversity & Inclusion.** We are committed to equal employment opportunities regardless of gender, gender expression and identity, sexual orientation, religion, culture, origin, disability, age, or other personal and social characteristics. **\#WeAreAllUnique** **\#YouMakeUsUnique** Please let us know if you require us to accommodate any accessibility needs during the recruitment process **Benefits at NTT DATA Belgium** Mobility Budget Medical insurance for you and your family Life insurance Representation allowance Teleworking equipment + internet allowance Meal + Eco vouchers and more...! **Your profile:** **Technical Skills:** + Minimum of 5-8 years of experience with mainframe systems (IBM z/OS). + Knowledge of JCL, COBOL, DB2, CICS, IMS, RACF, SCLM. + Experience with system management tools (TSO/ISPF, SDSF). + Understanding of network technologies and protocols. **Educational Requirements:** + Bachelor's or Master's degree in Computer Science, Technical Informatics, or a related field. + Relevant certifications (IBM, mainframe) are a plus. **Soft Skills:** + Analytical thinking and problem-solving skills. + Ability to work under pressure and attention to detail. + Strong communication skills. + Team player with an independent work attitude. + Proficiency in English is mandatory, Dutch and French is an advantage. Sounds interesting? **Apply now or share with a friend** 🔹