GAYATRI BATSALA

Bharath University

Bachelor of Engineering (B.E.)

N/A – June 30, 2022

AU Technology Consulting Private Limited

Full Stack Developer

August 1, 2022 – Present

Chennai, Tamil Nadu, India

Nivory - Insurance Management System

August 1, 2022 – May 31, 2026

Web-based InsurTech platform enabling 1000+ U.S. policyholders to view policy details, track premium due dates, check bonus amounts, and process online premium payments securely without visiting an office, digitizing the complete insurance workflow and reducing manual processing by 60 percent. Architecture: MVC and Microservices-based design - ReactJS frontend communicates via REST APIs with Spring Boot controllers, delegating to Service layer with JWT security filter, persisting via Hibernate ORM to MySQL on AWS RDS, deployed on AWS EC2 with S3 for document storage. Key Modules and Features: Security Module: JWT authentication and RBAC using Spring Security - token generation on login, validation on every API request, role-based endpoint access control for policyholders and admin users. Policy Management: REST APIs with GetMapping, PathVariable, RequestParam, and server-side pagination to fetch active and expired policies, premium amounts, due dates, and bonus details with optimized MySQL queries. Payment Processing: POST API with Valid annotation, idempotency key validation, database-level unique constraints for duplicate prevention, transaction recording, and real-time payment confirmation to ReactJS UI. Customer Profile: PUT and PATCH APIs with Hibernate entity mapping, input validation, and custom exception handling for full and partial profile updates. Logging and Monitoring: SLF4J and Log4j integration for structured API request logging, payment audit trail, and error event tracking for production monitoring. AWS Deployment: Application hosted on EC2, MySQL on RDS, documents on S3, with environment-specific Spring Boot profiles for dev, UAT, and production. Real-Time Challenges Solved: Fixed Hibernate LazyInitializationException using Transactional boundaries and fetch strategy configuration - eliminated recurring production errors. Resolved concurrent payment duplication with idempotency keys and unique database constraints - ensured zero duplicate transactions in production. Optimized API performance from 4 seconds to 800 milliseconds (80 percent improvement) via HQL rewriting, composite MySQL indexing, and result pagination. Implemented API versioning (api/v1/) for backward compatibility during feature upgrades without breaking existing U.S. client integrations. Testing: 50+ Postman test cases covering happy path, edge cases (invalid IDs, expired policies, duplicate payments), and error response validation across all REST API endpoints. Impact: 60 percent reduction in manual office visits, improved policyholder satisfaction, and zero production payment failures for Amerisuare Cos U.S. client.