Tandem Developer

Overview

Job Title:

Base
24 / Tandem Developer

Location:

Alpharetta, GA / Berkeley Heights, NJ

Duration: 12+ Months Contract

(W2-Only)

We are looking for an experienced Base
24 / Tandem Developer to support Fiserv’s electronic payments platform. The ideal candidate will have strong expertise in the ACI Base
24 Classic environment running on HP Non Stop (Tandem) systems and will be responsible for development, enhancements, maintenance, and production support of mission-critical payment applications.

• 5+ years hands-on experience with ACI Base
  24 Classic (ESS, ATM/POS modules, Auth, Settlement).
• Strong working knowledge of HP Non Stop (Tandem) systems (Guardian OS).
• Proficiency in:
  • TACL
  • TAL / pTAL
  • SCOBOL / COBOL
  • C / C++ (optional but preferred)
• Enscribe files, Pathway, Expand, DDL, FUP, SCF.
• Experience in payment transaction flows, ISO
  8583 message formats, and switching.
• Familiarity with ATM devices, POS terminals, network interfaces, and card schemes.
• Good understanding of batch processes, file transfers (FTP, RDF), and TNS macros.
• Strong analytical and debugging skills in a real-time, high-availability environment.

• Experience working with Fiserv systems, processes, or payment platforms.
• Exposure to Base
  24-eps (nice to have).
• Knowledge of EMV, HSM, key management, and encryption configurations.
• Experience in Agile/Scrum development methodology.
• Good communication skills for client interaction and cross-team collaboration.

Bachelor’s degree in Computer Science, Engineering, or a related field (or equivalent experience).

• Develop, enhance, and maintain applications in ACI Base
  24 Classic on HP Non Stop (Tandem).
• Work on authorization, settlement, and POS/ATM transaction processing modules.
• Perform coding using TACL, TAL, SCOBOL, COBOL, C, and other Tandem utilities.
• Support and troubleshoot issues in production, ensuring high availability and minimal downtime.
• Participate in application deployment, regression testing, and migration activities on Tandem systems.
• Conduct analysis of business requirements and translate them into technical specifications.
• Work with Fiserv internal teams for release coordination, impact analysis, and validation.
• Perform file maintenance, configuration updates, network interface updates, card table changes, and parameter updates.
• Handle monitoring, debugging, and performance tuning on the HP Non Stop environment.