Built a multi-module Spring Boot backend with JWT-based authentication and role-based access control (RBAC) for secure access management.

Designed and implemented core backend features such as merchant onboarding, coupon management, QR-based redemption, reviews, and analytics, enhancing user and merchant interaction.

Integrated Stripe for payments, Twilio for SMS, and media upload services while developing a Flutter consumer app and React admin portal, ensuring clean API contracts and seamless data flow.

Developed a two-sided marketplace backend to support task posting, acceptance, status transitions, and role switching, facilitating efficient user engagement.

Implemented a payment escrow flow with transaction state management, dispute handling, and validation logic, ensuring secure and reliable financial transactions.

Added safety features such as idempotent request handling, rate limiting, and identity verification, improving platform reliability and security.

Architected and implemented the backend for a home-service booking platform, enabling users to schedule house cleaning appointments, select service options, and track orders via REST APIs.

Designed relational schemas and booking workflows to support order creation, scheduling, service provider availability, and time-based transitions, ensuring consistent transactional integrity.

Built business logic for pricing rules, cleaner assignment, payroll/payout systems, and admin tools, optimizing service dispatch, adjustments, and audit tracking.

Developed a C# SDK and Unity plugin to animate avatars using simulation-generated data, enhancing virtual interactions in the platform.

Built an AWS-based backend using C# and API Gateway, and developed secure data access for real-time workflows.

Implemented streaming and messaging tools with Kafka and RabbitMQ to support real-time rendering, ensuring efficient data processing and delivery.