Company Description

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

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

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nAbout the Role

nWe 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 solid hands-on experience in Core Java, Spring Boot, REST APIs, Microservices, SQL and third-party API integrations .

nHands-on experience with at least one live UPI application / UPI app is mandatory.

nKey Responsibilities

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Develop and maintain backend services using Core Java and Spring Boot .
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Build REST APIs and microservices for UPI and BBPS applications .
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Work on UPI transaction flows including initiation, validation, success/failed/pending handling, status enquiry, reversal, refund and callbacks/webhooks.
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Develop BBPS APIs for bill fetch, bill payment, transaction status, validation and reconciliation.
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Integrate with banks, PSPs, payment gateways, BBPS systems, billers and third-party APIs.
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Implement idempotency, duplicate prevention, retries, timeout handling and exception handling.
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Work with MySQL/PostgreSQL/Oracle and write optimized SQL queries.
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Troubleshoot production issues, perform RCA and implement permanent fixes.
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Participate in testing, code reviews, performance optimization and production releases.
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nMandatory Skills

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Core Java / Java 8+
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Spring Boot / Spring MVC
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REST APIs
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Microservices
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Hibernate / JPA
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SQL & Relational Databases
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API Integration
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Git
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Maven / Gradle
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JUnit / Mockito
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Postman / API Troubleshooting
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Exception Handling & Logging
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nMandatory Domain Experience

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Hands-on experience with at least one live UPI application / UPI app
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Understanding of UPI transaction lifecycle
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Payment APIs and financial integrations
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Transaction states, reversals, refunds, retries and reconciliation
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BBPS experience is highly preferred
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Banking / FinTech / Digital Payments experience is an advantage
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nGood to Have

nKafka / RabbitMQ, Redis, Docker / Kubernetes, AWS/Cloud, CI/CD, Prometheus/Grafana/ELK and high-volume transaction processing.

nIf you have robust Java backend expertise and hands-on UPI application experience, apply for this contract onsite chance.

📌 Java Backend Developer Upi & Bbps Tamil Nadu
🏢 ThreatXIntel
📍 Tamil Nadu