Mainframe Assembler Developer :: Wilmington , DE( Onsite)

Mainframe Assembler Developer

Wilmington , DE( Onsite)

Job Summary

We are looking for an experienced Mainframe Assembler Developer responsible for developing, maintaining, enhancing, and supporting mainframe applications using IBM High-Level Assembler (HLASM). The candidate should have strong knowledge of IBM z/OS environments, system-level programming, debugging, performance optimization, and mainframe application support.

Key Responsibilities

• Develop, maintain, and enhance applications using IBM Mainframe Assembler (HLASM).
• Analyze existing assembler programs and implement code changes based on business requirements.
• Debug and resolve production issues, abends, and system-level errors.
• Perform code reviews, unit testing, integration testing, and regression testing.
• Work with mainframe technologies such as JCL, COBOL, CICS, DB2, and VSAM, as applicable.
• Analyze dumps, trace program execution, and troubleshoot memory-related and data-related issues.
• Optimize assembler programs for performance, memory utilization, and CPU efficiency.
• Work with system utilities, macros, registers, storage management, and addressing techniques.
• Participate in requirement analysis, technical design, implementation, and deployment activities.
• Provide production support, root-cause analysis, and incident resolution.
• Prepare technical documentation and coordinate with cross-functional teams.

Required Technical Skills

• Strong experience in IBM Mainframe Assembler (HLASM).
• Good understanding of IBM z/OS architecture and mainframe operating environments.
• Knowledge of assembler instructions, registers, addressing modes, condition codes, and program linkage conventions.
• Experience with macros, subroutines, save areas, parameter passing, and storage management.
• Knowledge of JCL, datasets, utilities, and mainframe job execution.
• Experience in debugging, dump analysis, and problem determination.
• Familiarity with ISPF, TSO, SDSF, and mainframe development tools.
• Understanding of batch processing and mainframe application execution.

Preferred Skills

• Knowledge of COBOL, CICS, DB2, VSAM, and other mainframe technologies.
• Familiarity with IBM system services, supervisor calls (SVCs), and system-level programming, where applicable.
• Experience with performance tuning and production troubleshooting.
• Knowledge of change management, version control, and release management tools.
• Experience working in Agile or other structured software development environments.

Educational Qualifications

• Bachelor's degree in Computer Science, Information Technology, Engineering, or a related field, or equivalent professional experience.

Experience

• Typically 3–8 years of mainframe development experience, with relevant hands-on experience in Assembler.
• Experience requirements may vary depending on the seniority of the position.

Key Competencies

• Analytical and problem-solving skills.
• Strong debugging and troubleshooting capabilities.
• Attention to detail and code quality.
• Effective communication and teamwork.
• Ability to handle production incidents and meet project deadlines.