Mainframe Assembler Developer – Credit Card AuthorizationLocation: Onsite – Omaha, NE Long-Term Contract (W2/C2C)Locals - Preferred.Job Description:We are seeking a highly skilled Mainframe Assembler Developer with strong experience in the Credit Card Authorization domain to join our client’s core processing team in Omaha, NC. The ideal candidate will possess a solid background in Assembler, COBOL, JCL, and CICS, with a focus on transaction-heavy, high-performance systems.Key Responsibilities:Develop and maintain mission-critical applications using Assembler (HLASM) on IBM mainframes.Enhance and support Credit Card Authorization systems, ensuring high availability and performance.Collaborate with cross-functional teams for system design, analysis, and performance tuning.Write and optimize complex COBOL programs and JCL scripts for batch processing.Design and maintain CICS transactions and online programs for card authorization services.Troubleshoot issues and resolve production incidents with minimal downtime.Ensure compliance with security, audit, and regulatory requirements related to card transactions.Required Skills:7+ years of experience in Mainframe developmentStrong hands-on experience in Assembler (HLASM) programmingProficiency in COBOL, JCL, and CICSSolid understanding of Credit Card Authorization, transaction routing, and host systemsExperience working in high-volume, real-time payment environmentsFamiliarity with debugging tools like Expeditor, File-Aid, etc.Ability to work independently and meet tight deadlines in a production environmentNice to Have:Experience with IBM MQ, DB2, or VSAMExposure to PCI compliance and card network integrations (Visa, MasterCard, etc.)Prior experience in financial services or payment processing platforms