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Senior Mainframe Developer Jobs in Ontario (NOW HIRING)

Mainframe Developer

Toronto, ON · On-site

CA$81K - CA$115K/yr

The Senior Mainframe Developer is responsible for the design, development, modernization, and support of critical applications within Core Investment Management (Core IM). The role involves ...

New

As a Senior Developer, you will be working in a development and support capacity on our core mainframe cards and transactions system. The core application is a large, sophisticated mainframe-based ...

Senior Software Engineer (Mainframe)

London, ON · On-site

CA$81K - CA$115K/yr

Adhere to enterprise engineering frameworks, software development methodologies, release processes, and control standards applicable to mainframe development and delivery. * Actively identify and ...

Senior Software Engineer (Mainframe)

Toronto, ON · On-site

CA$81K - CA$115K/yr

Adhere to enterprise engineering frameworks, software development methodologies, release processes, and control standards applicable to mainframe development and delivery. * Actively identify and ...

Senior IT Build/CICS Programmer

Toronto, ON · Remote

CA$81K - CA$115K/yr

We are seeking a Senior CICS systems programmer to join our team providing system support of IBM ... Middleware & Database Technical Services group within Infrastructure & Engineering - Mainframe ...

z/OS Connect Systems Programmer

Toronto, ON · On-site

CA$81K - CA$115K/yr

Mainframe & Database Services group within Mainframe Delivery, Infrastructure and Engineering Team ... KEY ACCOUNTABILITIES This job posting is for a Sr z/Connect & IMS Systems Programmer. The ...

Mentor developers and promote engineering excellence, innovation, and continuous learning. Key ... Experience supporting and integrating Mainframe applications and infrastructure . * Strong ...

CA$70 - CA$75/hr

... programming concepts and languages, internet/intranet and emerging technologies. * Demonstrated ... mainframe, micro/mini systems, etc.) and multi-tiered open-standard technologies such as JSP ...

New

... design and development, programming concepts and languages, internet\/intranet and emerging ... desktop, mobile, mainframe, micro\/mini systems, etc.) and multi\-tiered open\-standard ...

New

Software Engineer III

Toronto, ON · On-site

CA$125K - CA$154K/yr

Regular interactions with senior members of the technology team will be required as well as ... Mainframe experience: * COBOL, JCL, IMS DB/DC environment, IMS Databases, DB2, MQ, Endevor, CA7 ...

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Senior Mainframe Developer information

See Ontario salary details

$29

$49

$71

How much do senior mainframe developer jobs pay per hour?

As of Sep 4, 2026, the average hourly pay for senior mainframe developer in Ontario is $49.29, according to ZipRecruiter salary data. Most workers in this role earn between $42.07 and $56.49 per hour, depending on experience, location, and employer.

What is a senior mainframe developer?

Senior Mainframe Developers are experienced professionals who design, develop, and maintain mainframe systems—large-scale computers used by organizations for critical applications, bulk data processing, and enterprise resource planning. They are proficient in languages like COBOL, JCL, and Assembler, and often work with databases and transaction processing systems. Their responsibilities include troubleshooting system issues, optimizing performance, mentoring junior developers, and ensuring the reliability and security of mainframe operations.

What are some common challenges faced by senior mainframe developers when integrating legacy systems with modern technologies?

Senior Mainframe Developers often encounter challenges when integrating legacy mainframe systems with newer technologies such as cloud platforms, APIs, or microservices. These challenges include ensuring data consistency, maintaining system security, and minimizing downtime during migrations. Collaboration with cross-functional teams, such as infrastructure engineers and application developers, is key to developing seamless integration solutions. Staying up-to-date with modernization tools and best practices can help address these complexities and support the organization's digital transformation goals.

What are the key skills and qualifications needed to thrive as a senior mainframe developer, and why are they important?

To thrive as a Senior Mainframe Developer, you need deep expertise in mainframe programming languages (like COBOL, JCL, and PL/I), systems analysis, and a strong understanding of legacy application architectures, typically supported by a degree in computer science or related experience. Familiarity with tools such as IBM z/OS, DB2, CICS, and version control systems is essential, along with relevant certifications like IBM Certified System Programmer. Excellent problem-solving, communication, and leadership skills help you collaborate effectively and mentor junior developers. These skills are crucial for maintaining mission-critical systems, ensuring reliability, and guiding modernization efforts in complex enterprise environments.

What are the most commonly searched types of Mainframe Developer jobs in Ontario?

The most popular types of Mainframe Developer jobs in Ontario are:

What are popular job titles related to Senior Mainframe Developer jobs in Ontario?

For Senior Mainframe Developer jobs in Ontario, the most frequently searched job titles are:

What job categories do people searching Senior Mainframe Developer jobs in Ontario look for?

The top searched job categories for Senior Mainframe Developer jobs in Ontario are:

What cities in Ontario are hiring for Senior Mainframe Developer jobs?

Cities in Ontario with the most Senior Mainframe Developer job openings:

Infographic showing various Senior Mainframe Developer job openings in Ontario as of August 2026, with employment types broken down into 78% Full Time, 11% Part Time, and 11% Contract. Highlights an 80% Physical, 5% Hybrid, and 15% Remote job distribution, with an average salary of $102,528 per year, or $49.3 per hour.

Senior Mainframe Developer - Application Design - Hybrid

Tech Talent International

Toronto, ON • Hybrid

CA$50/hr

Full-time

Re-posted 4 days ago


Job description

Tech Talent International (TTI) supplies technical talent to a variety of clients ranging from Fortune 100/500/1000 companies to startups, small and mid-sized organizations in Canada/US. We are currently hiring a Senior Mainframe Developer - Application Design - Hybrid for our consulting client in the Toronto area.

Role: Senior Mainframe Developer - Application Design - Hybrid

Type: Contract

Rate Range: $50/hr C2C (40 hrs /week)

Duration: 8 months + potential extensions

Location: Hybrid (2 onsite/3 days from home) downtown Toronto, ON, Canada

Mainframe Senior Developer
Skills Required: 

Mainframe DB2 

Application Development~System I 

COBOL400~IT IS_AMS_Mainframe_DB2 Administration
Experience Required: 6-8 Years
Qualifications :

Experience in Mainframe lead Developer
Should have coding experience in CICS,COBOL, DB2, JCL.
Experience with application design, development and deployment
Skills and Responsibilities:

Design, develop and maintain Mainframe COBOL & JCL to meet support and/or project requirements.
Interface with business and IT teams to understand business requirements and translate business requirements into formal technical requirements and application code.
Develop and execute unit test and integration plans/scripts to validate that application changes meet technical specifications.
Responsible for full System Development Life Cycle Participate in production support Provide Solution Delivery Methodology artifacts associated with application components.
Participate in technical reviews at appropriate stages of development.