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Senior Mainframe Developer Jobs in Ontario (NOW HIRING)

Join an impactful role as a Senior Mainframe z/OS System Programmer. Bring your deep knowledge of mainframe environments to ensure operational resilience and compliance in a flexible remote setting.

CA$180K - CA$230K/yr

Senior Mainframe RACF Security Administrator About the job Senior Mainframe RACF Security ... Experience with z/OS security and z/OS systems programming functions. * Understanding of RACF ...

Work on Mainframe-based payment processing systems under senior guidance, learning core Mainframe ... Programming Language), Programming Languages, Software Applications, Software Development Life ...

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 ...

CA$120K - CA$170K/yr

Job Overview The Senior Full Stack Developer is a senior level position responsible for ... Experience in integrating mainframe applications with Kafka or API is a plus * 6+ years of relevant ...

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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 Aug 9, 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 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 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 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 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 84% Full Time, 2% Part Time, and 14% Contract. Highlights an 81% Physical, 4% 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

Posted 7 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.