Senior Mainframe Applications Developer
Confirmed on the employer's own hiring board on Oct 6, 2026. First seen by Alion on Oct 5, 2026. Citi scores A on the Alion truth index.
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 model 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.
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Job Family Group:
Technology------------------------------------------------------
Job Family:
Applications Development------------------------------------------------------
Time Type:
Full time------------------------------------------------------
Primary Location Full Time Salary Range:
$94,300.00 - $141,500.00------------------------------------------------------
Most Relevant Skills
Please see the requirements listed above.------------------------------------------------------
Other Relevant Skills
For complementary skills, please see above and/or contact the recruiter.------------------------------------------------------
Automated Processing and AI
We use automated processing, including artificial intelligence, for our legitimate business interests (or our reasonable and appropriate business purposes) to identify and align the candidate's skills and abilities with a specific job opening. Additionally, if you so choose, or consent, we can match your skills and abilities to other suitable roles at Citi.
Importantly, all our hiring processes and decisions, including determining your suitability for a role, are conducted, checked, and decided by individuals. Our automated processing and AI do not involve relying on automatic or autonomous decision-making. Please refer to any Jurisdictional Considerations, with specific provisions for your country (where relevant) for further details.
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This job opening is for an existing job vacancy.
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