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Mainframe Assembler Programmer Jobs in Ontario (NOW HIRING)

Software Engineer III

Toronto, ON

CA$125K - CA$154K/yr

  • Medical

  • Retirement

  • PTO

Mainframe experience: * COBOL, JCL, IMS DB/DC environment, IMS Databases, DB2, MQ, Endevor, CA7 ... Nice to have - SAS, Assembler, IBM Pervasive Encryption * Strength in developing effective ...

Mainframe Assembler Programmer information

See Ontario salary details

$10

$44

$81

How much do mainframe assembler programmer jobs pay per hour?

As of Aug 13, 2026, the average hourly pay for mainframe assembler programmer in Ontario is $44.92, according to ZipRecruiter salary data. Most workers in this role earn between $22.36 and $58.89 per hour, depending on experience, location, and employer.

What are the typical day-to-day responsibilities of a mainframe assembler programmer?

As a Mainframe Assembler Programmer, your daily tasks often include writing, testing, and debugging assembler code to support core business applications and system utilities. You’ll work closely with systems analysts, application developers, and operations teams to troubleshoot issues, optimize program performance, and implement software enhancements. Regular responsibilities may also involve reviewing system logs, maintaining documentation, and participating in system upgrades or migrations. The role often requires a proactive approach to problem-solving and collaboration within a structured, process-driven team environment.

Are mainframe assembler programmer jobs in demand?

Mainframe assembler programmer jobs remain in demand in industries that rely on legacy systems, such as finance, government, and insurance. These roles require knowledge of mainframe environments, assembly language, and often involve maintaining or upgrading existing mainframe applications. Demand is steady due to the continued use of mainframes for critical business operations.

What are the key skills and qualifications needed to thrive as a mainframe assembler programmer?

To thrive as a Mainframe Assembler Programmer, you need strong expertise in low-level programming, a deep understanding of mainframe architectures (such as IBM z/OS), and often a degree in computer science or related field. Familiarity with tools like TSO, ISPF, JCL, and debugging utilities, along with experience using source control and system monitoring software, is highly valued, and certifications in mainframe technology can be beneficial. Excellent problem-solving abilities, meticulous attention to detail, and effective communication skills help you succeed in complex, team-based environments. These technical and interpersonal abilities are critical for maintaining system reliability, ensuring performance, and supporting business operations across large-scale enterprises.

What does a mainframe assembler programmer do?

A mainframe assembler programmer writes and maintains low-level assembly language code for mainframe computers, often working on system software, utilities, or application programs. They use tools like IBM Assembler and need a strong understanding of computer architecture, machine instructions, and debugging techniques to optimize performance and ensure system stability.

Is mainframe assembler programming difficult?

Mainframe assembler programming is considered complex due to its low-level nature, requiring a strong understanding of hardware architecture, memory management, and instruction sets. It often involves detailed coding and debugging, making it challenging for those without prior experience in systems programming or assembly language. Proficiency in tools like IBM's assembler and knowledge of mainframe environments are essential for success.

What is a mainframe assembler programmer?

A Mainframe Assembler Programmer is responsible for writing, maintaining, and optimizing assembly language programs that run on mainframe computers. They work with low-level machine instructions to develop high-performance applications, often in industries like banking, insurance, and government. Their role includes debugging, performance tuning, and integrating new or existing software with mainframe systems. Strong knowledge of IBM mainframes, z/OS, and tools like High-Level Assembler (HLASM) is essential.

What are popular job titles related to Mainframe Assembler Programmer jobs in Ontario? For Mainframe Assembler Programmer jobs in Ontario, the most frequently searched job titles are:
What job categories do people searching Mainframe Assembler Programmer jobs in Ontario look for? The top searched job categories for Mainframe Assembler Programmer jobs in Ontario are:
Infographic showing various Mainframe Assembler Programmer job openings in Ontario as of August 2026, with employment types broken down into 100% Full Time. Highlights an 67% In-person, and 33% Hybrid job distribution, with an average salary of $93,443 per year, or $44.9 per hour.

Software Engineer III

Td

Toronto, ON

CA$125K - CA$154K/yr

Full-time

Medical, Retirement, PTO

Re-posted 20 hours ago


Job description

Work Location:

Toronto, Ontario, Canada

Hours:

37.5

Line of Business:

Technology Solutions

Pay Details:

$125,500 - $154,000 CADThe pay details posted reflect a temporary market premium specific to this role that is reassessed annually.

TD is committed to providing fair and equitable compensation opportunities to all colleagues. Growth opportunities and skill development are defining features of the colleague experience at TD. Our compensation policies and practices have been designed to allow colleagues to progress through the salary range over time as they progress in their role. The base pay actually offered may vary based upon the candidate's skills and experience, job-related knowledge, geographic location, and other specific business and organizational needs.

As a candidate, you are encouraged to ask compensation related questions and have an open dialogue with your recruiter who can provide you more specific details for this role.

Job Description:

Job Description:

Leads and/or facilitates the creation of a comprehensive end-to-end solution as well as initial to final delivery estimations for all applications under the umbrella of the technology team. Overall accountability for the technical design and delivery of high to mid-level System Design Specifications (SDS) based on requirements from stakeholders.

Develop and maintain technical solutions, ensuring adherence to engineering and architectural design principles while meeting business requirements. Provide technical expertise with a focus on efficiency, reliability, scalability, and security; includes planning, evaluating, recommending, designing, operationalizing, and supporting solutions in compliance with enterprise and industry standards.

Ultimately, providing expert advice and lead in system / application administration, installation, configuration / provisioning, platform planning and design, integration and release / deployment management.

Breadth & Depth

Solutions will vary from small to application specific deliverables as part of large-scale, complex or enterprise projects. Regular interactions with senior members of the technology team will be required as well as collaboration with solution architect.

As this role requires deep technical and domain knowledge, experience in 1 or more of the following areas is required

  • Business domain knowledge
    • Debit Card and/or Credit Card
    • Card Payments including Authentication/Authorization
    • Retail Banking
    • Nice to have: ATM, POS, Digital channels, Call Centre
  • Ecosystem knowledge
  • Payment Networks - Interac, Visa
  • Global Payment Standards (Nice to have)
  • PCI (Payment Card Industry) standards on data handling, data encryption
  • EMV (EuroPay, MasterCard, Visa) standards on card chip configuration, personalization and scripting
  • CBA (Canada Banking Act) standards for card

Candidate with knowledge in multiple areas will be preferred.

Experience & Education

  • Undergraduate Bachelors Engineering Degree in Computer Science/IT or Graduate degree in Engineering streams or relevant work experience
  • 12+ years of mainframe technology experience handling design, development and delivery with developers,
  • 5+ years of Technology lead experience with exposure and involvement in large-scale or transformation projects requiring complex technology integration design

Preferred Qualifications

  • Mainframe experience:
    • COBOL, JCL, IMS DB/DC environment, IMS Databases, DB2, MQ, Endevor, CA7, JCL Tools such as ICEMAN, DFHSORT
    • Nice to have - SAS, Assembler, IBM Pervasive Encryption
  • Strength in developing effective relationships with different business units, portfolio and project managers, vendors.
  • Ability to present and make recommendations to senior management
  • Enthusiasm and willingness to foster a culture that encourages productivity, innovation, process improvement, teamwork and a high level of professionalism.

Who We Are:

TD is one of the world's leading global financial institutions and is the fifth largest bank in North America by branches/stores. Every day, we strive to make every interaction, product, and experience remarkably human and refreshingly simple for over 27 million households and businesses in Canada, the United States and around the world. More than 95,000 TD colleagues bring their skills, talent, and creativity to foster deeper relationships, ensure disciplined execution, and build a simpler, faster banking experience. TD is deeply committed to being a leader in client experience, that is why we believe that all colleagues, no matter where they work, are client facing. Together, we are reimagining what banking can be for our clients, colleagues and communities.

Our Total Rewards Package
Our Total Rewards package reflects the investments we make in our colleagues to help them and their families achieve their financial, physical, and mental well-being goals. Total Rewards at TD includes a base salary, variable compensation, and several other key plans such as health and well-being benefits, savings and retirement programs, paid time off, banking benefits and discounts, career development, and reward and recognition programs. Learn more

Additional Information:
We're delighted that you're considering building a career with TD. Through regular development conversations, training programs, and a competitive benefits plan, we're committed to providing the support our colleagues need to thrive both at work and at home.

Please be advised that this job opportunity is subject to provincial regulation for employment purposes. It is imperative to acknowledge that each province or territory within the jurisdiction of Canada may have its own set of regulations, requirements.


Colleague Development

If you're interested in a specific career path or are looking to build certain skills, we want to help you succeed. You'll have regular career, development, and performance conversations with your manager, as well as access to an online learning platform and a variety of mentoring programs to help you unlock future opportunities.

If you're passionate about helping clients and building deep, lasting relationships, TD offers diverse career paths where you can grow your expertise and make a meaningful impact.

We're committed to your success and foster a respectful workplace where diverse perspectives are valued, everyone has fair opportunities to grow, and you can unlock your full potential to achieve your career goals. Here at TD, we hire and develop the best.

Training & Onboarding
We will provide training and onboarding sessions to ensure that you've got everything you need to succeed in your new role.

Interview Process
We'll reach out to candidates of interest to schedule an interview. We do our best to communicate outcomes to all applicants by email or phone call.


Accommodation
Your accessibility is important to us. Please let us know if you'd like accommodations (including accessible meeting rooms, captioning for virtual interviews, etc.) to help us remove barriers so that you can participate throughout the interview process.
We look forward to hearing from you!

Language Requirement (Quebec only):

Sans Objet