Led the full rearchitecture of Pathao's loyalty service, increasing active users from 4% to 21%. Introduced RDBMS and Google Pub/Sub, achieving ~50% performance improvement in availing benefits and redeeming deals for 5M+ users.

Re-architected data storage, significantly reducing load on the primary database and improving endpoint performance.

Extended the driver-service platform to support CNG vehicles, owning the full feature design including time-slotted kit installation scheduling and a resource-sharing system allowing multiple CNG drivers to operate under a shared CNG unit.

Core backend system managing driver lifecycle data — capabilities, online/offline status, adherence, documents, and kit distribution.

Designed and developed the core-subscription system using clean architecture, responsible for BNPL (Buy Now Pay Later) and Driver-Subscription services. Implemented auto-renew mechanism for seamless subscription renewals.

Redesigned Driver-Subscription to enable 13% more bike riders to join the platform with attractive incentives.

Refactored payment processing framework using Chain of Responsibility and Strategy design patterns. Supports 5+ payment providers across 16 operation domains — buy, sell, transfer, refund, KYC, webhooks, and more.

Implemented async queue-based transaction processing with checkpoint state tracking, PCI-compliant data encryption, and configuration-driven multi-tenancy.

Designed and developed a multi-tenant subscription management microservice powering recurring billing for campaigns with flexible plans, automated renewals, and payment processing via CrowdPay integration.

Built CI/CD pipeline using GitHub Actions, Docker, and Kubernetes to deploy to Amazon EKS with zero downtime.

Onboarded Vaki, a Colombian crowdfunding platform, onto the Creative Backing Protocol infrastructure. Managed full KYC processes and payment integrations including cash, card, and bank transfers via Mercado Pago.

Microservices-based product review platform. Backend split into Admin and Main services, each running in isolated Docker containers with separate databases. Services communicate asynchronously via RabbitMQ events.

Online platform to browse and book tickets for upcoming events. Ships with both a web interface and a native Android application built in Java.

Undergraduate thesis — an AI-powered educational tool that generates questions and answers from Bengali paragraphs. Trained contextual embeddings (ELMo) for the Bangla language and built a question-answering proof of concept. Supervised by Dr. Nabeel Mohammed.

Extended a Facebook Research approach to unsupervised machine translation using only monolingual corpora — applied to the Bengali language. Research project supervised by Dr. Nabeel Mohammed at North South University.

Research project applying various cluster analysis techniques to predict and identify root causes of employee absenteeism in the workplace. Supervised by Dr. Sifat Momen at North South University.

A to-do list desktop application for managing daily tasks. Built with Java using the JavaFX framework and Scene Builder. Features a clean UI with Material Design components via JFoenix.