Rohan Kumrawat | Full Stack Developer

Full Stack Developer (Freelance / Contract)

Self-Employed, Indore, MP

Contract · Jan 2024 - Present

Delivered 4 production applications end-to-end across agritech, healthcare, and fintech domains — covering system design, REST API development, database schema design, third-party integrations, and cloud deployment on Railway, AWS Lightsail, and Vercel.
Architected a multi-tenant seed verification SaaS (BeejQR) with credit-wallet monetization, atomic deductions, and Razorpay payment webhook automation currently serving 3 enterprise clients.
Designed and implemented multi-tenant SaaS architecture with centre/tenant-level data isolation enforced via JWT payload and a 3-layer guard chain (Auth - Isolation - Service), ensuring zero cross-tenant data leakage across all database queries.
Built and deployed backends using NestJS, Express.js, PostgreSQL, Sequelize, and TypeORM; integrated third-party services including Razorpay (payments + webhooks), WhatsApp Business API (bulk messaging), and Cloudinary (media management).
Translated client business requirements into technical specifications; managed iterative delivery with regular stakeholder reviews across all 4 engagements.

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