As a Senior Mainframe Applications Developer, you will build, test, and support critical mainframe applications using COBOL, JCL, and CICS, directly shaping how Citi's technology platforms serve its business users. This role sits within Citi's Technology team, where you will take ownership of the full development lifecycle, from design through implementation, while advising teams on best practices. You will work with a high degree of independence, acting as a go-to specialist for complex application challenges.
Responsibilities Design and build new or revised mainframe applications using COBOL, JCL, and CICS to meet specific business needs.
Lead feasibility studies, time estimates, and cost estimates to support technology planning decisions.
Manage every phase of the development lifecycle, including analysis, design, construction, testing, and implementation.
Provide ongoing operational support to business users on live applications.
Analyze complex system and business process issues, drawing on in-depth application development expertise to resolve them.
Develop security measures following implementation reviews to strengthen system design and functionality.
Advise clients and other technology teams on programming solutions and support the rollout of customer-facing systems.
Coach junior developers and help define development standards for the wider team.
Required Qualifications & Skills 5 to 8 years of experience in systems analysis and applications development.
Hands-on experience building and maintaining applications with COBOL.
Hands-on experience writing and managing JCL scripts.
Practical experience developing with CICS.




A track record of managing and delivering successful technology projects.
Working knowledge of project management and consulting techniques.
Ability to manage shifting priorities and tight deadlines without losing focus on quality.
Bachelor's degree or equivalent practical experience.
Education Bachelor's degree/University degree or equivalent experience
What We Offer Join a technology team where your mainframe expertise directly supports systems used across the business, and where your growth is matched by real ownership of projects.
Work in a hybrid mode with 3 days in the office and 2 days working remotely.
Gain exposure to large-scale systems and global technology teams.
Access structured learning and development programs to grow your technical skills.
Benefit from financial wellbeing programs and resources that support long-term planning.
Work in an environment that supports a sustainable balance between career and personal life.
Build and support the mainframe systems that keep Citi's business running by applying today.
Primary Location Full Time Salary Range: $94,300.00 - $141,500.00
Citi is an equal opportunity employer, and qualified candidates will receive consideration without regard to their race, color, religion, sex, sexual orientation, gender identity, national origin, disability, status as a protected veteran, or any other characteristic protected by law.
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📌 Senior Mainframe Applications Developer (Ontario)
🏢 Citigroup
📍 Ontario