Company Description
ThreatXIntel is a growing Cybersecurity, IT Staffing, and Consulting company delivering end-to-end technology and security solutions.

We are hiring for our corporate client. ThreatXIntel is the official hiring partner for this requirement.

About the Role
We are looking for a Java Backend Developer with 3–5 years of experience to work on UPI, PPI and BBPS backend applications . The candidate must have robust hands-on experience in Core Java, Spring Boot, REST APIs, Microservices, SQL and third-party API integrations .
Hands-on experience with at least one live UPI application / UPI app is mandatory.
Key Responsibilities
Develop and maintain backend services using Core Java and Spring Boot .
Build REST APIs and microservices for UPI and BBPS applications .
Work on UPI transaction flows including initiation, validation, success/failed/pending handling, status enquiry, reversal, refund and callbacks/webhooks.
Develop BBPS APIs for bill fetch, bill payment, transaction status, validation and reconciliation.
Integrate with banks, PSPs, payment gateways, BBPS systems, billers and third-party APIs.
Implement idempotency, duplicate prevention, retries, timeout handling and exception handling.




Work with MySQL/PostgreSQL/Oracle and write optimized SQL queries.
Troubleshoot production issues, perform RCA and implement permanent fixes.
Participate in testing, code reviews, performance optimization and production releases.
Mandatory Skills
Core Java / Java 8+
Spring Boot / Spring MVC
REST APIs
Microservices
Hibernate / JPA
SQL & Relational Databases
API Integration
Git
Maven / Gradle
JUnit / Mockito
Postman / API Troubleshooting
Exception Handling & Logging
Mandatory Domain Experience
Hands-on experience with at least one live UPI application / UPI app
Understanding of UPI transaction lifecycle
Payment APIs and financial integrations
Transaction states, reversals, refunds, retries and reconciliation
BBPS experience is highly preferred
Banking / FinTech / Digital Payments experience is an advantage
Good to Have
Kafka / RabbitMQ, Redis, Docker / Kubernetes, AWS/Cloud, CI/CD, Prometheus/Grafana/ELK and high-volume transaction processing.
If you have strong Java backend expertise and hands-on UPI application experience, apply for this contract onsite opportunity.

📌 Java Backend Developer – UPI & BBPS (Chennai)
🏢 ThreatXIntel
📍 Chennai