Mainframe Developer Jobs in Ontario (NOW HIRING)

You are as unique as your background, experience and point of view. Here, you'll be encouraged, empowered and challenged to be your best self. You'll work with dynamic colleagues - experts in their fields - who are eager to share their knowledge with you. Your leaders will inspire and help you reach your potential and soar to new heights. Every day, you'll have new and exciting opportunities to make life brighter for our Clients - who are at the heart of everything we do. Discover how you can make a difference in the lives of individuals, families and communities around the world.

Job Description:

We're evolving how we attract and engage with our clients, and as a Mainframe Software Engineer on our team, you'll design, develop, support, and analyze large-scale applications and systems. This is a hands-on role focused on building high-quality solutions while growing your technical depth and contributing to meaningful client experiences.

This role is ideal for an engineer who thrives in a collaborative environment, values learning and continuous improvement, and can adapt to changing priorities while maintaining delivery quality.

Own Your Contributions

• Break down and analyze application requirements into well-scoped work items
• Design and develop mainframe applications under the guidance of senior engineers
• Identify risks and raise them early to protect delivery timelines
• Make sound technical decisions aligned with team standards and long-term maintainability
• Contribute to maintaining the health, reliability, and evolvability of existing systems

Build and Learn

• Contribute to end-to-end application development using modern mainframe tools (IBM IDz, zDevOps, VS Code, Zowe, GitHub Copilot)
• Write production-quality COBOL code with appropriate testing and documentation
• Learn and apply lightweight engineering practices that balance speed and quality
• Stay current with emerging technologies and AI-assisted development tools

Collaborate Effectively

• Work with peers, senior engineers, and stakeholders to deliver solutions
• Clearly communicate progress, risks, and trade-offs
• Contribute to improving client and developer experience through collaboration
• Share knowledge with peers and contribute to improving team practices and standards

What You Bring

• 3 - 5 years of experience in mainframe application development
• Working knowledge of zOS / OS/390 environments
• Experience with TSO/ISPF, DB2, IMS, JCL, and COBOL
• Understanding of MQ and middleware concepts
• Strong problem-solving and communication skills
• Familiarity with Git, Bitbucket, Jenkins, and zDevOps pipelines is a plus
• Experience with agile methodologies such as Scrum or Kanban is an asset
• As this position is posted in several locations, we specify that bilingualism (French, English, both oral and written) is required for Quebec only for the frequent interactions with English and French-speaking colleagues or internal partners across Canada or worldwide.

Product Mindset

• You think in terms of client and business outcomes
• You're comfortable learning through iteration and feedback
• You value ownership, accountability, and continuous improvement

Why This Role

• Opportunity to contribute to systems that support clients' well being
• Work within a collaborative and inclusive engineering culture
• Ongoing learning through coaching, training, and hands-on experience
• Access to modern development tooling and a supportive team environment

Notes / Operational Expectations

Occasional offhours or weekend support may be required during key production activities; participation in an oncall rotation may apply

The Base Pay range is for the primary location for which the job is posted. It may vary depending on the work location of the successful candidate or other factors. In addition to Base Pay, eligible Sun Life employees participate in various incentive plans, payment under which is discretionary and subject to individual and company performance. Certain sales focused roles have sales incentive plans based on individual or group sales results.

Diversity and inclusion have always been at the core of our values at Sun Life. A diverse workforce with wide perspectives and creative ideas benefits our Clients, the communities where we operate and all of us as colleagues. We welcome applications from qualified individuals from all backgrounds.

Persons with disabilities who need accommodation in the application process, or those needing job postings in an alternative format, may e-mail a request to thebrightside@sunlife.com.

We are proud to be a hybrid organization that offers our employees the choice and flexibility to work from both the office and virtually based on the needs of the business, our Clients and you! Several work options are available and can be discussed throughout the selection process depending on the role requirements and individual needs.

We may use artificial intelligence to support candidate sourcing, screening, interview scheduling.

We thank all applicants for showing an interest in this position. Only those selected for an interview will be contacted.

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