You will get ISO 8583 Payment Message Integration for Java Spring Boot
Project details
Most payment integration projects stall because the developer understands
the code but not the protocol. ISO 8583 has strict message construction
rules, field-level encoding requirements, and switch-specific quirks that
only come from working in production payment systems.
I've built and shipped ISO 8583 middleware that processes real card
transactions — Sale, Reversal, Void, and Settlement — between POS terminals
and payment switches. The work includes EMV data handling, ARQC/ARPC
cryptogram processing, response code mapping, and end-of-day settlement
batch flows, all persisted to PostgreSQL with full audit trails.
What you get is production-ready code with proper error handling, logging,
and documentation — not a proof of concept.
the code but not the protocol. ISO 8583 has strict message construction
rules, field-level encoding requirements, and switch-specific quirks that
only come from working in production payment systems.
I've built and shipped ISO 8583 middleware that processes real card
transactions — Sale, Reversal, Void, and Settlement — between POS terminals
and payment switches. The work includes EMV data handling, ARQC/ARPC
cryptogram processing, response code mapping, and end-of-day settlement
batch flows, all persisted to PostgreSQL with full audit trails.
What you get is production-ready code with proper error handling, logging,
and documentation — not a proof of concept.
Web Programming Project
API DevelopmentProgramming Languages
JavaCoding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$150
|
Standard
$350
|
Advanced
$700
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 21 days |
Number of Revisions | 1 | 2 | 3 |
Source Code |
About Hussain
Fintech Backend Engineer | Java Spring Boot | ISO 8583
Karachi, Pakistan - 5:55 am local time
For the past 3 years I've been working as a backend engineer in the fintech space,
where I've shipped two systems that are live in production:
The first is a card transaction processing platform running between banks and their
merchant POS networks. It handles the full transaction lifecycle — Sale, Reversal,
Void, and Settlement — over ISO 8583, built on Java Spring Boot with PostgreSQL,
Docker, and AWS.
The second is a World Bank-funded platform built to disburse financial assistance
to flood-affected households. The hard problems there were reliability, auditability,
and handling a beneficiary base that couldn't afford system errors.
On the technical side, my core work is in ISO 8583 message construction and switch
integration, EMV and contactless POS terminal integration, payment gateway and
acquiring middleware using Spring Boot and JPOS, and PostgreSQL schema design for
financial systems. I also handle the infrastructure side — Docker, Kubernetes, and
AWS (EC2, EKS, ECR, S3) — so I can own a service end to end, not just write the
application layer.
I'm a good fit if you're building or scaling something in the payments or fintech
space and need someone who understands the domain, not just the stack. If you're
integrating a payment switch, standing up POS middleware, or architecting a
transaction backend, reach out.
Steps for completing your project
After purchasing the project, send requirements so Hussain can start the project.
Delivery time starts when Hussain receives requirements from you.
Hussain works on your project following the steps below.
Revisions may occur after the delivery date.
Step 1
Requirements & spec review
Step 2
Message schema design & field mapping