Senior Software Engineer – Mainframe COBOL, z/OS, CICS, JCL
Manufacturers and Traders Trust Company
Buffalo, NY · Posted November 4, 2026
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Where Buffalo, NY ranks
Where Buffalo, NY placed in our monthly rankings, month by month. Each month stays online at its own address.
November 2026
- #8Best cities for junior jobs in New York29% · of 11
- #10Best cities for software and engineering jobs in the Northeast121 openings · of 52
- #10Best all-round cities for new graduates in the Northeast51 / 100 · of 26
- #13Cities with the most jobs that do not need a four-year degree in the Northeast44 jobs · of 36
- #13Best cities for mid-career professionals in the Northeast54% · of 70
- #13Best all-round cities for mid-career professionals in the Northeast50 / 100 · of 26
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
Pay compared with the market
This listing does not state pay. Across 1,013 open senior software engineer listings that state pay, the middle half runs $166,000 to $222,000 and the median is $197,500.
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Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
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About the job
This role is four days onsite, with the flexibility to work from home one day per week M&T Work Model - 4 Days In-Office | 1 Day Work From Home
Overview
Senior-level owner of design, development, modernization, and production support for business-critical IBM z/OS applications. Individual-contributor technical leader combining deep COBOL batch and online expertise with modern Git-based engineering, test automation, and CI/CD.
Primary Responsibilities:
Technical Leadership & Engineering Delivery
Lead technical design, development, enhancement, and support of mainframe applications, owning technical decisions and delivery quality for assigned domains under SDLC governance.
Partner with business and technology stakeholders to align delivery with priorities, requirements, risk controls, and enterprise standards.
Software Engineering Excellence
Deliver secure, efficient, maintainable, and resilient mainframe code; lead design, troubleshooting, and performance tuning across batch and online processing.
Establish coding standards and quality expectations for maintainability, performance, security, and resiliency.
SDLC, DevOps & Quality Engineering
Review and approve solution designs, code changes, peer reviews, and deployment readiness.
Define test strategy for mainframe changes, covering batch validation, automated regression and reconciliation testing, performance checks, and implementation verification.
Build and maintain Git-based CI/CD workflows with dependency-aware builds, static analysis and security quality gates, controlled promotion, and rollback readiness to improve productivity and reduce manual effort.
Technical Requirements & Solution Design
Ensure requirements, solution designs, and implementation plans are complete, feasible, scalable, secure, and aligned with standards.
Guide architecture, integration patterns, and modernization across mainframe and connected platforms, translating mainframe constraints into business, delivery, risk, and operational impacts.
Operational Excellence & Modernization
Lead incremental modernization through API enablement (e.g., z/OS Connect), modularization, and secure integration with distributed and cloud platforms while preserving transactional integrity.
Own technical health by improving resiliency, reducing defects and technical debt, and guiding remediation plans.
Ensure production readiness for batch schedules, online transactions, restart/recovery, monitoring, and support documentation; lead incident root-cause analysis and post-incident reviews.
Apply AI-assisted engineering and automation responsibly where appropriate.
Communication & Collaboration
Communicate architecture, decisions, progress, and risks clearly to technical and business stakeholders.
Influence technical decisions across teams without direct authority, presenting in architecture reviews and knowledge-sharing forums.
Maintain documentation and partner across business, architecture, infrastructure, security, operations, risk, and audit teams.
Ensure changes comply with risk, regulatory, policy, change management, security, data protection, and access control standards, with auditable evidence; escalate risks and address audit and regulatory items on time.
Support a culture of belonging, reflect the M&T Bank brand, maintain internal controls, and complete other assigned duties.
Scope of Responsibilities
Serve as an individual-contributor technical lead accountable for technical direction, design quality, code review, modernization, and production stability; no direct people management.
Own technical outcomes for assigned applications, platforms, or domains, including design, delivery quality, operational readiness, and risk remediation, influencing engineers, architects, and partners through expertise and standards.
Education & Experience Required:
Associate’s degree and a minimum of 5 years’ systems analysis and/ or application development work experience or Bachelor's degree and a minimum of 3 years’ systems analysis and/ or application development work experience. In lieu of degree, a combined minimum of 7 years’ education and/or relevant work experience, including a minimum of 3 years’ systems analysis and/or application development work experience.
Required Technical Skills
Strong hands-on experience with IBM z/OS application engineering using COBOL, JCL, CICS, VSAM, and batch and online transaction processing.
Experience diagnosing abends, data, transaction, and performance issues using z/OS debugging, file-analysis, and JES/SDSF tools.
Experience with Git-based source control, peer review, and CI/CD for enterprise applications.
Working knowledge of mainframe security, access control, auditability, change management, and resiliency.
Experience integrating mainframe applications through MQ, APIs, files, or events.
Required Leadership & Delivery Experience
Expert analytical and software engineering skills, with strong understanding of SDLC, testing, deployment, resiliency, security, and change management.
Experience leading technical initiatives or engineering workstreams as an individual-contributor technical lead.
Experience reviewing solution designs, technical requirements, and code changes.
Education & Experience Preferred:
Bachelor’s degree in Computer Science and a minimum of 5 years of systems analysis and/or application development experience.
Preferred Technical Skills
z/OS Connect, ZDIH, API design, and integration with distributed or cloud platforms in support of modernization and platform resiliency.
Mainframe DevOps and test automation (e.g., IBM DBB/zBuilder, Test Accelerator for Z, SonarQube, Ansible) and modern IDE workflows (IDz, VS Code, Zowe, USS); responsible use of approved AI-assisted tools.
Easytrieve+, CA7/Control-M, File-AID, Abend-AID, Xpediter, InterTest, or equivalent tools.
Preferred Delivery & Collaboration Experience
Experience improving production stability, defect reduction, and engineering productivity.
Experience influencing technical decisions and presenting to technology and business stakeholders in Agile delivery environments.
We support our team members with generous benefits.
Competitive compensation
Health, welfare, and retirement benefits
401(k) match at 5%
Work-life balance and flexible work arrangements
Banking Officers start with 25 days PTO plus 12 paid holidays
40 hours paid volunteer hours per year
Much more. For details, see: M&T Benefits Overview
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M&T Bank is committed to fair, competitive, and market-informed pay for our employees. The pay range for this position is $97,100.00 - $161,800.00 Annual (USD). The successful candidate’s particular combination of knowledge, skills, and experience will inform their specific compensation.
Location Buffalo, New York, United States of America