Mainframe Assembler Developer

Job Summary

Seeking two Principal Mainframe Assembler Developers for a contract role focused on leading a critical Fuel Pre-Authorization project, where the developers will modify low-level Mainframe Assembler code, support mainframe operations during cloud migration, and implement real-time transaction logic, all while working remotely.

Key responsibilities

• Modify and develop low-level Mainframe Assembler (BAL) code for the 0120 automated fuel dispenser transaction
• Maintain and support ongoing mainframe operations to ensure business continuity during cloud migration
• Implement architecture changes for near-real-time transaction processing and ensure proper transaction reversals

Required qualifications

• 15+ years of experience in Mainframe IBM Assembler (BAL) development
• Deep hands-on experience with the Connex switching/payment processing environment
• Proven expertise using Xpediter for mainframe debugging and troubleshooting
• Strong understanding of financial transaction messaging and automated fuel dispenser workflows
• Previous experience in environments undergoing mainframe-to-cloud migration is highly preferred