✅ Client(Onsite): bKash Ltd (70M+ customers, Largest Mobile Financial Service Provider in Bangladesh, listed in Fortune Top-50 for social impact) - bkash.com/en• Led requirement analysis, feasibility assessment, and estimations across cross-functional teams.• Designed system and database architecture, developed core features, and provided code reviews.• Built high-volume money transfer features, enhancing customer transaction experiences. • Developed message queue-based user segmentation and segment-based promotional notification scheduling features, improving marketing/campaign effectiveness.• Implemented eMoney agent’s geolocation, app events tracking along with sales target & achievement tracking features, boosting agent's sales performance.• Migrated critical object storage from cloud to on-premises, ensuring Bangladesh Central Bank compliance.✅ Tech Stack: Java 11, Spring Boot, Spring MVC, Spring Webflux, Microservices, REST, GraphQL, SOAP, AWS (S3, SSM, EC2, DynamoDB, SQS, Lambda, API Gateway, Cloudwatch), Redis, Postman, Maven, Docker, Tomcat, Kubernetes, Javascript, Jquery, CSS, HTML, Git

✅ Product: Goods In Motion - Leading On-demand Goods Delivery Platform in Bangladesh - gim.com.bd/en● Developed demand-supply monitoring services, GPS-based automated delivery tracking, and other core business features, which drastically improved operational efficiency by reducing manual efforts.● Led all vehicle tracker services integration along with on-call support for outage detection and resolution.● Built payment gateway-based cashless trip payment services along with demurrage charge settlement.● Implemented message queue-based asynchronous communication for data exchange between services.● Developed trip recommendation feature for drivers using geometry-based reverse geo-coding.● Built fraud-free user verification & on-boarding using Govt. National Identity Verification Service. ● Integrated Spring Security & JWT-based role authentication and authorization for customers/drivers/admins.● Implemented OAuth2.0-based Graph API integration to streamline automated trip creation from emails.● Improved latency for critical APIs & optimized production database & critical query performance.● Involved in production issues troubleshooting & conducted devops tasks for automation scripts.✅ Tech Stack: Java 8, Spring Boot, Spring MVC, Spring Security, Microservices, REST, GraphQL, MySql, SQL, Hibernate, Flyway, AWS S3, Athena, SQS, SES, RDS, EC2, Junit, Swagger, Postman, Maven, Jenkins CI/CD, Tomcat, Python, Git