Java Developer

NAZZTEC

Chennai, Tamil Nadu, India

Java Developer — Promotions |

Department: Product Development — Promotions

Reporting To: Promotions Platform Lead

Location: Chennai — On-site

Experience: 2–5 Years

Employment Type: Full-time

Job Summary

We are looking for a Java Developer with 2–5 years of hands-on development experience to join the Promotions Product Development team. The candidate will be responsible for developing, enhancing, debugging, testing, and maintaining a promotions engine within an established retail technology product.

The ideal candidate should have strong Core Java, SQL, Hibernate/JPA, REST APIs, XML/JSON, JavaScript and JSP experience, along with strong debugging and production-support capabilities. Experience working with Jenkins, SVN, unit/integration testing and relational databases is required.

Candidates from software product companies are preferred, particularly those with exposure to retail, POS, promotions, pricing, loyalty, billing or other transaction-oriented systems.

Key Responsibilities

Develop and maintain promotion-related features across:
REST APIs
Business rules
Promotion logic
Reports
Backend services
Develop enhancements using Java while working within an existing product codebase.
Analyze and resolve application defects using:
Application logs
Stack traces
Exceptions
Database queries
Debugging tools
Investigate and resolve live/production application issues.
Safely modify, refactor and enhance legacy/established code.
Identify opportunities for technical-debt reduction.
Improve application performance, reliability and maintainability.
Write and maintain unit tests and integration tests.
Build, package and deploy applications using Jenkins.
Manage source code and version control using SVN.
Diagnose integration issues between the promotions platform, POS systems and other connected applications.
Participate in root-cause analysis (RCA) for recurring defects and production issues.
Implement defect-prevention and corrective actions.
Work closely with product, QA and technical teams to deliver reliable product enhancements.
Technical Skills — Mandatory

1. Core Java — Must Have

2–5 years of hands-on Java development.
Strong understanding of Java fundamentals.
Object-Oriented Programming — OOP.
Collections.
Exception handling.
Multithreading/concurrency fundamentals.
Java I/O and common Java APIs.
Debugging and code-level troubleshooting.
Ability to understand and modify an existing Java codebase.2. SQL & Relational Databases — Must Have
Strong SQL knowledge.
Relational database concepts.
Joins.
Subqueries.
Aggregations.
Query optimization/basic performance analysis.
Database troubleshooting.
Ability to analyze production issues through database queries.3. Hibernate / JPA — Must Have
Hands-on experience with Hibernate and/or JPA.
ORM concepts.
Entity mapping.
Relationships.
CRUD operations.
Querying and transaction handling.4. REST APIs — Must Have
REST API development/maintenance.
API integration.
HTTP methods and status codes.
Request/response handling.
JSON processing.
API debugging and troubleshooting.5. XML / JSON — Must Have
XML processing.
JSON processing.
Data serialization/deserialization.
Troubleshooting API/integration payloads.6. JavaScript & JSP — Must Have
JavaScript fundamentals.
JSP development/maintenance.
Ability to work on existing web application components.
Understanding of backend-to-frontend integration.7. Testing — Must Have
Unit testing.
Integration testing.
Test-case development.
Defect reproduction.
Regression testing.
Ability to write tests for newly developed or modified functionality.8. Debugging & Production Support — Must Have

This is a particularly important part of the role.

Candidates should be capable of:

Reading application logs.
Understanding stack traces/exceptions.
Reproducing defects.
Debugging Java code.
Identifying database-related issues.
Troubleshooting API/integration failures.
Performing root-cause analysis.
Supporting live/production applications.9. Jenkins — Must Have
Build and deployment using Jenkins.
Understanding of CI/CD pipelines.
Application build/package/deployment troubleshooting.10. SVN — Must Have
Practical experience with Subversion (SVN).
Source-code check-in/check-out.
Branching/merging.
Version management.

Preferred / Good-to-Have Skills

Rule Engine / Promotions

Drools
Rule-engine development
Business-rule implementation
Decision tables
Promotion/rule evaluation logicDrools is preferred but not mandatory if the candidate has strong Java fundamentals and is willing to learn rule-engine technology.

Frontend

React
Modern JavaScript
Basic frontend development experienceDomain Experience

Candidates with experience in any of the following domains are preferred:

Retail technology
POS
Point of Sale
Promotions
Pricing
Loyalty
Billing
Retail ERP
Order management
Store management
Transaction processing
Distribution management
E-commerce/retail platformsProduct Company Preference

Software product-company experience is preferred over pure IT-services experience.

Strong candidates may have experience in:

Product development
Product maintenance
Enterprise applications
Retail products
SaaS products
POS products
Transaction-processing platforms
Long-running/established product codebasesCandidates from service companies can still be considered if they have strong hands-on Java development + production debugging + product/application ownership experience.

AI Coding Tools — Preferred

Candidates who have practical exposure to AI-assisted software development tools can be considered positively, particularly for:

Understanding unfamiliar/legacy code
Debugging assistance
Generating unit tests
Code refactoring suggestions
Documentation/code explanation
Identifying potential defects

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