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 expe

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