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 (Chennai)
🏢 ThreatXIntel
📍 Chennai