Projects | Goutam Kumar Sah - Java Technical Lead & Cloud Enthusiast

Spring BootJavaRedisRabbitMQKafkaMySQLAWS EC2/S3MicroservicesELKWSO2

Designed and developed robust RESTful APIs for both mobile and web platforms, powering secure digital wallet transactions and real-time wallet management.
Integrated multiple third-party APIs (Mobile Recharge, AEPS, DMT, BBPS, E-KYC, CMS, IMPS, NEFT) to expand platform capabilities and services.
Implemented RabbitMQ for microservices communication, Redis for high-performance caching and session management, and ELK stack for centralized logging and analytics.
Configured and managed AWS EC2 instances for scalable production deployments, including environment setup and AWS S3 integration for secure document storage.
Led backend architecture, ensuring high availability, performance, and seamless integration of new features and third-party services.

Spring BootJavaRedisRabbitMQMySQL

Designed and architected microservices modules for the e-BACS platform.
Led and mentored a backend team of 4 developers, ensuring timely and quality deliverables.
Developed robust RESTful APIs to support core business functionalities.
Integrated Redis for efficient caching and improved application performance.
Deployed on NIC infrastructure and enabled automated SMS/Email alerts using RabbitMQ.

MicroservicesOdooSpring BootMySQLPostgreSQLWhatsApp Business API

Developed and maintained a scalable online car auction platform enabling seamless buying and selling of vehicles for dealers and individuals.
Implemented a microservices architecture using Spring Boot for backend services, ensuring modularity and high availability.
Integrated Odoo ERP for inventory, CRM, and auction management workflows.
Utilized MySQL and PostgreSQL databases for robust data storage and reporting.
Integrated WhatsApp Business API for real-time notifications, customer engagement, and auction updates.

Spring BootJavaMicroservicesREST APIMySQLWallet Integration

PAN Verification: Seamlessly validate PAN details and check PAN card status to confirm company identity.
GSTIN Verification: Access comprehensive GSTIN information, including filing preferences, return history, business nature, and address details.
Bank Account Verification: Cross-verify bank account holder names with GSTIN and PAN, providing a precise name match percentage for accuracy.
CIN Verification: Retrieve company master data, registration status, ROC, paid-up capital, and authorized personnel details.
Electricity Bill & IEC Verification: Validate business addresses and obtain Import Export Code (IEC) details, including branch and director data.
Wallet Integration: Manage payments securely for e-KYC and verification services.
QR Code Generation: Generate QR codes for secure sharing and quick access to verified company details.
Advanced Validation: Automatically flag discrepancies and provide actionable insights to improve compliance and accuracy.

Spring BootJavaRedisActiveMQMSSQLJPAAPMMicroservicesWSO2AWSReact

Developed RESTful web service APIs for both web and mobile platforms, enabling core social networking features.
Integrated ActiveMQ to facilitate real-time SMS and email notifications for enhanced user engagement.
Implemented APM Server for comprehensive Spring Boot application performance monitoring and log management.
Configured and managed AWS EC2 instances for scalable and secure project deployment.
Utilized Redis for efficient caching and session management, improving application responsiveness.

Spring BootJava 17+MySQLJPA/HibernateFeign ClientSwagger/OpenAPIWhatsApp Business APIMaven

Developed a robust REST API for sending WhatsApp messages (text, documents, images) to single or multiple recipients, integrated with the MoneyTree platform.
Implemented asynchronous message processing for fast API responses and improved scalability.
Integrated Feign client for seamless WhatsApp Business API communication and managed configuration via database and properties files.
Utilized JPA/Hibernate with MySQL for configuration and message persistence, and implemented caching for frequently used configuration values.
Provided comprehensive API documentation using Swagger/OpenAPI and ensured secure, versioned endpoints with token-based authentication.

PythonFlaskJSONRESTful Web ServicePyCharmGITBitbucket

Developed RESTful web service APIs for data extraction, transformation, and loading (ETL) of Excel files.
Implemented logic to process raw Excel files, transform data into the desired format, and generate new Excel files as API responses.
Utilized Postman for comprehensive API workflow testing and validation.
Managed source code versioning using GIT and Bitbucket.
Configured and deployed the application environment and web server for production access.

PythonOdoo 10MySQL