Mainframe Assembler (HLASM) Developer

Astra-North Infoteck Inc. ~ Conquering today’s challenges, achieving tomorrow’s vision!; Toronto; On-site; CAD 80,000 - 110,000; Full time

Job summary

A leading technology firm in Toronto is seeking a skilled Mainframe Developer to create and maintain applications using IBM Assembler and Mainframe DB2. The ideal candidate will have 4-6 years of experience and will work on modernization projects involving advanced systems and integration with cloud technologies. If you excel in debugging and performance tuning and have a passion for supporting critical enterprise applications, we encourage you to apply.

Qualifications

• 4-6 years of application development experience with Mainframe DB2.
• Strong skills in IBM Assembler (HLASM) required.
• Experience with debugging and performance tuning in mainframe environments.

Responsibilities

• Create, enhance, and maintain mainframe applications using Assembler.
• Debug and resolve issues using specialized tools.
• Participate in modernization projects involving cloud technologies.

Skills

Agile Way of Working

IBM Assembler (HLASM)

Mainframe DB2

Tools

IBM Debug Tool

Fault Analyzer

IPCS

Job description

Skills

• Agile Way of Working
• Mainframe DB2 - Application Development Experience Required: 4‑6 years
• Retirements - Smartcomm Developer (Desirable)

A mainframe developer with strong IBM Assembler (HLASM) skills is a specialist responsible for developing, maintaining, and modernizing critical, low‑level enterprise applications that require precise control and high performance. This role often involves supporting legacy systems in core industries such as banking and finance.

Role Descriptions

• Development and Maintenance – Creating, enhancing, and maintaining mainframe applications using Assembler, often in conjunction with other languages such as COBOL, CICS, PLI, and JCL.
• Debugging and Issue Resolution – Performing active debugging, performance tuning, and issue resolution using specialized tools such as IBM Debug Tool, Fault Analyzer, and IPCS to analyze dumps and logs.
• System Programming – Working with MVS supervisor services, 64‑bit, and cross‑memory services for advanced system‑programming tasks.
• Modernization Efforts – Participating in projects to migrate and modernize mainframe systems, which may involve working with cloud technologies or AI‑powered features.
• Collaboration – Working closely with system analysts, operations teams, and client stakeholders to ensure seamless integration and reliability.