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Senior Mainframe Software Engineer

Job in Southwestern Ontario, London, Ontario, Canada
Listing for: Sun Life Financial
Full Time position
Listed on 2026-03-11
Job specializations:
  • Software Development
    Software Engineer
Salary/Wage Range or Industry Benchmark: 100000 - 125000 CAD Yearly CAD 100000.00 125000.00 YEAR
Job Description & How to Apply Below
Location: Southwestern Ontario

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 Senior Mainframe Software Engineer on our team, you'll design, develop, support, and analyze large-scale applications and systems — making the technical calls that matter while shaping how we build and ship software that inspires clients and sales professionals to believe that life's bright.

This is a hands‑on role for an engineer who thrives in a fast-moving, collaborative environment, moves deliberately without sacrificing quality, and cares deeply about creating meaningful client experiences. You'll be resilient, a strong team member, and equally effective in communicating and adapting to change as time‑to‑market pressures and evolving business priorities shift our plans.

Own the Delivery
  • Break down and analyze complex application requirements into well‑scoped, actionable work items
  • Design and develop large‑scale mainframe applications, defining technical approaches, dependencies, and milestones before work starts
  • Identify risks early and adjust scope or approach to protect delivery timelines
  • Make pragmatic technical decisions that balance speed, quality, and long‑term maintainability
Build and Evolve
  • Deliver end‑to‑end application development using industry‑leading mainframe tools and modern development environments (IBM IDz, zDevOps, VS Code, Zowe, etc.)
  • Write production‑quality code while leveraging AI‑assisted development tools (VS Code Copilot, etc.)
  • Establish lightweight engineering practices that enable speed without sacrificing fundamentals
  • Keep current with trends in emerging technologies and how they contribute to the evolution of our systems and client experiences
Collaborate
  • Work directly with stakeholders and external technical partners, leading technical discussions in a clear and effective manner
  • Clearly communicate trade‑offs, risks, and timelines to both technical and non‑technical audiences
  • Continuously strive to improve the client experience through collaborative problem‑solving
  • Contribute to a dynamic, innovative culture where continuous improvement is valued and rewarded
Shape the Team
  • Champion modern engineering practices, tools, and technologies that give the team a competitive edge
  • Mentor teammates and guide technical direction through code reviews and design discussions
  • Build reusable components and technical foundations that accelerate future work
  • Someone who keeps current with emerging technologies and leads by example in continuous self‑improvement
What You Bring
  • 5-10 years of progressive information technology experience with full mainframe application development life cycle and systems integration experience
  • Excellent working knowledge of the IBM OS/390 and zOS mainframe environment
  • Experience and understanding of TSO/ISPF, DB2, IMS, JCL, and other mainframe utilities
  • Experience using the COBOL development language
  • Understanding of MQ Series and other middleware technologies
  • Excellent problem analysis and troubleshooting skills
  • Strong leadership, planning, organizational and consulting skills
  • Keen appetite for learning relevant technologies and for continuous self‑improvement
  • Strong technical and problem‑solving skills with the ability to show initiative and take responsibility
  • An effective communicator who utilizes technical knowledge to lead discussions with stakeholders and external partners
  • Familiarity with Git, Bitbucket, Jenkins, Dev Ops pipeline is a plus
  • Experience using modern mainframe development environments (IBM IDz, Zowe, etc.) is a plus
  • Experience leveraging AI tools for mainframe development (IBM Watson

    X, VS Code…
Position Requirements
10+ Years work experience
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