Job#: 3047245 : Senior Mainframe Application Developer (MECH) Client: Top 5 Bank

Location: Downtown Toronto, ON

Hybrid/Onsite: Remote with flexibility hybrid

Engagement Type: 6-12 month contract-to-hire

Position Overview A financial-services organization is seeking senior Mainframe Application Developers to design, enhance, and support mission-critical core deposit systems.

Specific Functions of This Role:

- Lead projects through all SDLC stages, coaching more junior staff, ensuring BMO code standards are maintained
- Work on complex projects impacting core banking operations
- Provide senior level technical analysis and support for E2E project teams
- Support on-call as needed

Responsibilities

- Lead application work through all SDLC stages.
- Analyze existing systems and design appropriate solutions.
- Develop and enhance mainframe applications.
- Perform technical impact analysis.
- Support complex core-banking initiatives.
- Review code and maintain established development standards.
- Coach and mentor junior developers.
- Troubleshoot application and data-processing problems.
- Partner with quality engineering, operations, and production support.
- Participate in production support and on-call rotation as required.

Qualifications:

- In-depth knowledge of core banking processing, and mainframe
- 10 - 15+ years of system design, analysis and mainframe programming experience
- Extensive mainframe application development experience.
- Knowledge of assembler or PL1, CICS and DB2 are assets
- Core banking, deposits, payments, or transaction-processing experience.
- Strong system design and technical analysis capability.
- Experience with CICS and DB2.
- Experience working across the complete SDLC.
- Ability to troubleshoot online and batch-processing issues.
- Technical leadership and mentoring experience.
- Solid analytical skills for complex problem solving
- Detail oriented with strong organizational skills





Preferred Qualifications

- Assembler or PL/I.
- COBOL and JCL.
- Proprietary core banking systems.
- Production support.
- API integration or modernization initiatives.
- Large-scale financial transaction systems.

Success profile The ideal candidate remains highly hands-on, understands both code and business impact, and can lead delivery while developing less-experienced team members.

EEO Employer

Everforth Apex Systems is an Equal Employment Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, age, sexual orientation, gender identity, national origin, disability, protected veteran status, or any other characteristic protected by law.

Everforth Apex

Systems will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Employee Services Department at [email protected] or (phone hidden).

Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning.

We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package.



Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Everforth Apex Benefits Overview:

In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. © 2026 Everforth, Inc. All rights reserved.

Everforth Apex Systems is part of the Commercial Segment of Everforth, Inc.

NYSE: EFOR

4400 Cox Road

Suite 200

Glen Allen, Virginia 23060

Everforth Apex is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law.

Everforth

Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Benefits Department at [email protected] or (phone hidden). (Do not submit resumes or solicit consultants to this email address). UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex.

📌 Senior Mainframe Application Developer (MECH) (Toronto)
🏢 Apex Systems
📍 Toronto