Mainframe Assembler Developer

Key Responsibilities

• Core Development: Modify, develop, and optimize low-level Mainframe Assembler (BAL) code to support updates to the 0120 automated fuel dispenser transaction.

• Real-Time Processing: Implement logic changes to adjust pre-authorization amounts and update real transaction amounts in near real-time.

• System Integration: Collaborate closely with internal teams and Visa to align client-side changes with Visa s 0120 confirmation advice, ensuring flawless processing and transaction reversals.

• Testing & Debugging: Utilize Xpediter to debug complex Assembler code, isolate defects, and support rigorous unit and integration testing.

• Requirement Refinement: Actively participate in flushing out technical requirements alongside client teams, translating business needs into robust technical designs.

• Phased Delivery: Support a multi-phase release schedule, ensuring code stability and backward compatibility across deployment phases.

Required Qualifications & Experience

Technical Skills:

• 15+ years of experience in Mainframe IBM Assembler (BAL) development.

• Connex Platform: Deep hands-on experience working within the Connex switching/payment processing environment.

• Debugging Tools: Proven expertise using Xpediter for mainframe debugging and troubleshooting.

• Payment Systems Knowledge: Strong understanding of financial transaction messaging, specifically automated fuel dispenser (AFD) workflows and pre-authorization/clearing cycles.

Professional Attributes:

• Experience working on high-volume, near-real-time transaction processing systems where data integrity is paramount.

• Ability to hit the ground running in a fast-paced environment with requirements currently being finalized.

• Excellent collaboration skills to seamlessly integrate with existing client teams and coordinate with external networks (Visa).

Preferred Qualifications (Nice to Have)

• Familiarity with Visa ISO 8583 messaging standards or similar payment network specifications.

• Experience with phased, large-scale migration or deployment strategies in a banking or retail fueling environment.