Company Description

Threat XIntel is a growing Cybersecurity, IT Staffing, and Consulting company delivering end-to-end technology and security solutions.

We are hiring for our corporate client. Threat XIntel 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 strong 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 My SQL/Postgre SQL/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 / Fin Tech / Digital Payments experience is an advantage

Good to Have

Kafka / Rabbit MQ, 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 chance.

📌 Java Backend Developer – Upi & Bbps (Chennai)
🏢 ThreatXIntel
📍 Chennai