Senior Mainframe Developer

Experis; New York (NY); On-site; USD 120,000 - 165,000; Full time

Benefits offered by this job

Medical plan

Dental plan

Vision plan

Health Savings Account

401(k) with match

Weekly pay

Job summary

Experis is seeking a Senior Mainframe Payments Developer to join our client in New York, NY. The role focuses on supporting critical ACH processing systems and enhancing Fiserv PEP applications, leveraging COBOL, JCL, DB2, VSAM, and CICS.

You will analyze complex payment flows, troubleshoot failures, and coordinate resolutions with business and operations teams. On-site work in NYC is required for this assignment.

Qualifications

• Extensive mainframe development experience with COBOL, JCL, DB2, CICS, and VSAM.
• Hands-on Fiserv PEP experience and ACH/NACHA knowledge.
• Ability to troubleshoot payments, processing bottlenecks, and reconciliation.
• Strong analytical and communication skills.

Responsibilities

• Support, maintain, and enhance Fiserv PEP applications for ACH processing.
• Develop changes using COBOL, JCL, DB2, VSAM and related mainframe tech.
• Analyze and resolve ACH processing issues and production incidents.
• Understand end-to-end ACH flows including settlement and returns.
• Collaborate with business and operations to perform root cause analysis.

Skills

Mainframe development

COBOL

JCL

DB2

CICS

VSAM

ACH payments

Analytical thinking

Communication

Tools

Fiserv PEP

Job description

Our client, a leading organization in the financial services industry, is seeking a Senior Mainframe Developer to join their team. As a Senior Mainframe Developer, you will be part of the IT department supporting critical payment processing systems. The ideal candidate will demonstrate strong problem-solving skills, adaptability, and a collaborative mindset, which will align successfully in the organization.

Job Title

Senior Mainframe Payments Developer (Fiserv PEP + ACH)

Location

New York, NY

Duration

6-12 Months

What's the Job?

• Support, maintain, and enhance Fiserv PEP applications to ensure seamless ACH transaction processing.
• Develop and implement technical and business-driven changes using COBOL, JCL, DB2, VSAM, and related mainframe technologies.
• Analyze and resolve ACH processing issues, defects, and production incidents efficiently.
• Understand end-to-end ACH payment flows, including settlement, returns, corrections, and exception processing.
• Collaborate with business and operations teams to perform root cause analysis and coordinate resolutions.

What's Needed?

• Extensive experience in Mainframe development with proficiency in COBOL, JCL, DB2, CICS, and VSAM.
• Hands-on expertise with Fiserv PEP applications and solid knowledge of ACH payments, NACHA formats, and ACH processing workflows.
• Ability to troubleshoot payment failures, processing bottlenecks, and settlement/reconciliation issues from both technical and functional perspectives.
• Strong analytical, problem-solving, and communication skills.
• Willingness to support on-site work in New York, NY, with travel covered by the organization if necessary.

What's in it for me?

• Opportunity to work on critical payment processing systems within a dynamic organization.
• Collaborate with experienced professionals in a supportive environment.
• Gain valuable experience in ACH payments and mainframe technologies.
• Participate in a role that encourages continuous learning and professional growth.
• Be part of a company committed to diversity, inclusion, and ethical practices.

Upon Completion Of Waiting Period Consultants Are Eligible For

• Medical and Prescription Drug Plans
• Dental Plan
• Vision Plan
• Health Savings Account
• Health Flexible Spending Account
• Dependent Care Flexible Spending Account
• Supplemental Life Insurance
• Short Term and Long Term Disability Insurance
• Business Travel Insurance
• 401(k), Plus Match
• Weekly Pay