Siddartha
Kunwar.

Production backend for a national bus booking platform — multi-operator, payment-integrated, transactionally consistent.

• ─Integrated three payment gateways — Khalti, eSewa, Stripe — with MongoDB session-backed transactional confirmations to keep booking state consistent under partial failures.
• ─Multi-tier RBAC across User, Operator, Driver, Admin, SuperAdmin with JWT authentication and Google OAuth.
• ─Booking workflow with real-time seat availability, three-hour auto-expiring holds, and email confirmations via Nodemailer.
• ─Designed a dynamic trip scheduling system with configurable day-of-week patterns and automatic instance generation.
• ─Ten-plus interconnected MongoDB models, RESTful API with custom query builder for filtering, pagination, search. OpenAPI / Swagger documented.

A multi-tenant SaaS for workspaces, kanban boards, files, and real-time team collaboration — with AI assistance built into the workflow.

• ─Modular multi-tenant architecture with ten-plus relational Prisma models and scalable API foundations.
• ─Realtime workspace collaboration via Socket.IO — task synchronization, presence, live updates.
• ─AI-assisted productivity features integrated through Google Gemini.
• ─JWT auth + RBAC, cloud file uploads, OpenAPI / Scalar documentation.
• ─Building solo end-to-end: backend architecture, database design, frontend dashboard, realtime systems, AI integration.

MERN social platform with auth, profiles, posts, likes and comments. A study in shipping a complete REST application end-to-end.

• ─JWT-based authentication, profile management, post/comment/like flows.
• ─Scalable REST API and production deployment configuration.
• ─Built end-to-end with React, Redux, Node, Express, MongoDB.