Payments Systems Engineer III — Postilion & ISO 8583

Csiweb

Valparaiso (IN)

On-site

USD 110,000 - 170,000

Full time

5 days ago

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Job summary

Computer Services, Inc. (CSI) seeks a skilled Software Engineer with deep expertise in ACI Postilion Realtime SDK and payment network integrations. You will design, develop, and support high‑volume payment processing solutions that connect with card networks and third‑party services.

The role covers Postilion development, network routing, and ISO 8583 messaging within production environments, with emphasis on reliability, security, and performance in mission‑critical systems.

Qualifications

5+ years of software development experience.
5+ years of hands‑on experience with ACI Postilion.
Strong experience developing solutions using Postilion Realtime SDK.
Experience supporting production payment switching environments.
Proven experience integrating payment networks and third‑party processors.

Responsibilities

Design, develop, and maintain Postilion-based payment solutions.
Develop new nodes using Rest API, routing logic, and authorization modules within the Postilion platform.
Customize and support Postilion transaction workflows to meet business and network requirements.
Develop interfaces between Postilion and external systems, including issuer hosts, fraud systems, and payment gateways.
Participate in system enhancements, upgrades, and migrations.

Skills

Postilion experience

Realtime SDK

Java

Payment networks

Network integration

SQL

REST APIs

TCP/IP

Tools

Postilion Realtime SDK

SQL

REST

Job description

The role covers Postilion development, network routing, and ISO 8583 messaging within production environments, with emphasis on reliability, security, and performance in mission‑critical systems.

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