Senior Mainframe Assembler Programmer

Global-Technical-Talent-1; Toronto; Hybrid; CAD 90,000 - 110,000; Full time

Job summary

Global-Technical-Talent-1 is seeking a Senior Mainframe Assembler Programmer in Toronto, hybrid onsite. The role focuses on IBM Assembler/HLASM within enterprise mainframe environments, touching banking applications and regulatory tech initiatives.

You will participate in design, development, testing, production support and technical analysis across legacy systems. The candidate should bring deep experience with z/OS, CICS, JCL, DB2, VSAM, COBOL and SDLC processes, with strong debugging and

Qualifications

• 5 years of mainframe application development experience.
• Strong hands-on IBM Assembler/HLASM expertise.
• Experience with z/OS, CICS, JCL, DB2, VSAM and TSO/ISPF.

Responsibilities

• Design, develop, test and implement mainframe enhancements using Assembler/HLASM.
• Translate requirements into design specifications and production-quality code.
• Support applications through the full SDLC, including testing and production support.
• Analyze existing programs for changes, dependencies and impact.
• Troubleshoot complex issues and perform root-cause analysis.
• Collaborate with COBOL developers, architects, analysts and infrastructure teams.
• Support regulatory and mandatory-change initiatives affecting core banking apps.
• Ensure solutions meet security, performance, resiliency, logging and error handling standards.

Skills

Assembler/HLASM

z/OS

CICS

JCL

DB2

VSAM

COBOL

SDLC

Communication

Teamwork

Tools

TSO/ISPF

JCL utilities

DB2 utilities

Job description

Senior Mainframe Assembler Programmer

Location: Toronto, ON

Onsite Flexibility: Hybrid

Contract Details

• Position Type: Contract
• Contract Duration: 6 months
• Pay Rate: C$65.00–C$80.00 / Hour (CAD)

Job Summary

Our client, a leading Canadian financial institution, is seeking an experienced Senior Mainframe Assembler Programmer to support business-critical banking applications and regulatory technology initiatives. The successful candidate will bring strong hands-on expertise with IBM Assembler / HLASM and deep experience working within enterprise mainframe environments. This role will involve application development, enhancement, testing, production support and technical analysis across complex legacy systems.

Key Responsibilities

• Design, develop, test and implement mainframe application enhancements using Assembler / HLASM.
• Translate business and technical requirements into detailed design specifications and production-quality code.
• Support applications across the full SDLC, from analysis and development through testing, implementation and production support.
• Analyze existing mainframe programs and identify required changes, dependencies and downstream impacts.
• Troubleshoot complex application issues and perform root-cause analysis.
• Work closely with COBOL developers, architects, analysts, QA and infrastructure teams.
• Support regulatory and mandatory-change initiatives impacting core banking applications.
• Ensure solutions meet enterprise standards for security, performance, resiliency, logging and error handling.

Required Skills

• Strong hands-on expertise with IBM Assembler / HLASM.
• Experience with z/OS, CICS, JCL, DB2, VSAM and TSO/ISPF.
• Good working knowledge of COBOL and integrated mainframe application environments.
• Strong debugging, troubleshooting and production-support skills.
• Experience delivering changes through structured SDLC environments.
• Strong communication and collaboration skills.

Preferred Skills

• Previous experience within banking or financial services strongly preferred.
• Experience supporting Personal Banking or core deposit applications.
• Familiarity with regulatory or compliance-driven technology initiatives.
• Experience with mainframe modernization, APIs or z/OS Connect.

Required Experience

• 5 years of mainframe application development experience.

About GTT

GTT is a minority-owned staffing firm and a subsidiary of Chenega Corporation, a Native American-owned company in Alaska. We highly value diverse and inclusive workplaces and support Fortune 500 organizations across banking, financial services, technology, life sciences, biotech, utilities, and retail sectors throughout the U.S. and Canada.

Job Number: 26-17412 Industry: Software Engineering

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