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 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 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 solid Java backend expertise and hands-on UPI application experience, apply for this contract onsite opportunity.

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