Job Description
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.n
Build REST APIs and microservices for UPI and BBPS applications.n
Work on UPI transaction flows including initiation, validation, success/failed/pending handling, status enquiry, reversal, refund and callbacks/webhooks.n
Develop BBPS APIs for bill fetch, bill payment, transaction status,



validation and reconciliation.n
Integrate with banks, PSPs, payment gateways, BBPS systems, billers and third-party APIs.n
Implement idempotency, duplicate prevention, retries, timeout handling and exception handling.n
Work with MySQL/PostgreSQL/Oracle and write optimized SQL queries.n
Troubleshoot production issues, perform RCA and implement permanent fixes.n
Participate in testing, code reviews, performance optimization and production releases.n

nMandatory Skills
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Core Java / Java 8+n
Spring Boot / Spring MVCn
REST APIsn
Microservicesn
Hibernate / JPAn
SQL & Relational Databasesn
API Integrationn
Gitn
Maven / Gradlen
JUnit / Mockiton
Postman / API Troubleshootingn
Exception Handling & Loggingn

nMandatory Domain Experience
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Hands-on experience with at least one live UPI application / UPI appn
Understanding of UPI transaction lifecyclen
Payment APIs

📌 Java Backend Developer Tamil Nadu (India)
🏢 ThreatXIntel
📍 India