Mainframe COBOL Programmer (Remote Spain)

Cactus is a software development company, providing full-cycle services for the European market. More than 170 companies increased business productivity using solutions developed by Cactus programmers. The company has been regularly included in the listings of the best software development companies in Belgium and Europe.

We are looking for a

Mainframe COBOL Programmer

to design, develop, maintain, and support applications running on IBM z/OS systems. You’ll work closely with technical teams, business analysts, and operations to ensure stable, secure, and efficient mainframe environments.

What You Will Do Develop, test, and maintain batch and online applications on IBM z/OS or similar mainframe platforms. Write, optimize, and debug COBOL, PL/I, or Assembler programs. Create and maintain JCL scripts for batch processing. Perform system analysis, troubleshoot issues, and provide production support. Collaborate with cross-functional teams to translate business requirements into technical solutions. Analyze performance issues and recommend improvements. Maintain documentation for code, processes, and system configurations. Support data migration, integration, and modernization initiatives.

What We Expect Strong proficiency with COBOL (COBOL/370, Enterprise COBOL). Solid experience with JCL (Job Control Language). Familiarity with CICS for online transaction processing. Experience working with VSAM files and datasets. Understanding of DB2 or IMS databases, including SQL for DB2. Knowledge of TSO/ISPF development environment. Proficiency with mainframe debugging and testing tools (e.g., Abend-Aid, Expeditor, File-Aid). Understanding of mainframe batch scheduling tools (e.g., CA-7, Control-M). Knowledge of system utilities (IDCAMS, SORT, SMP/E, etc.). Strong problem-solving and analytical skills. Ability to work in structured SDLC and change management environments. High English level. English is the working language (spoken and written).

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Preferred Qualifications* Experience with mainframe modernization or migration projects. Familiarity with REXX scripting. Exposure to MQ Series, SOAP/REST integration, or APIs connecting mainframe services. Experience in Agile or hybrid project environments. Understanding of security and compliance practices in large enterprise environments.

What We Offer Working with international clients. An environment to develop your professional capabilities and take ownership. Collaboration with a team of open, dynamic, and international experts. Full-time position with a competitive salary and benefits, including learning opportunities. Flexible working hours. Get together at team events.