**Company Description** Inetum is a European leader in digital services. The Inetum team of 28,000 consultants and specialists works daily to deliver digital impact for businesses, public sector entities, and society at large. Inetum’s solutions aim to enhance customer performance and innovation, as well as contribute to the common good. Present in 19 countries with an extensive network of delivery centers, Inetum partners with leading software vendors to address digital transformation challenges with proximity and flexibility. **Job Description** We are seeking a Mainframe / zOS / MQ Specialist Technician to join a long-term project with a major banking sector client. The role requires partial on-site presence at our client’s offices in Madrid. Additionally, availability to participate in telephone on-call rotations and interventions outside standard working hours is mandatory. **Requirements** Mandatory Technical degree in Computer Science, Telecommunications, or Systems Administration (minimum: Higher Vocational Training qualification). English level A2–B1 Minimum 2 years’ experience in support, operations, implementation, and evolution of the following technologies: * zOS Connect * MQ Series * IBM Integration Bus * IBM Sterling Transformation Extender * COBOL/DB2 development * Financial messaging (MT/MX/ISO20022/FileAct) * MFT Desirable * University degree * Master’s or PhD * Technical certifications * Methodological certifications (ITIL, SCRUM, PMP, etc.) * Demonstrable experience of 4 years or more * English proficiency above B1 level **Additional Information** * Hybrid working model with weekly presence in Madrid * Availability for on-call duties * Availability for rotating morning and afternoon shifts Monday through Friday * Indefinite contract * Salary commensurate with experience * Career development plan: we offer an attractive professional career path based on experience and personal potential within a company undergoing continuous evolution and solid growth. * Training plan in technological competencies aligned with project requirements and client needs. * Flexible remuneration: we offer a customizable compensation package allowing you to choose among various benefits and tailor their distribution—e.g., private health insurance, meal vouchers, childcare assistance, transport cards, etc.