Full-Stack Developer (BeejQR — Seed Verification SaaS Platform)

Freelance / Serving 3 Active Seed Manufacturing Enterprises

Project  ·  Jan 2025 - Present

Project Details

  • Architected a multi-tenant B2B AgriTech SaaS platform serving 3 active seed manufacturing companies with strict company-level data isolation, custom branding, and RBAC (OWNER / SUPER_ADMIN).
  • Built an atomic credit deduction wallet (500 credits/QR) using database transactions to guarantee zero double-spending under concurrent QR generation requests.
  • Integrated Razorpay payment gateway with HMAC webhook signature verification, automated invoice generation, and idempotent transaction logging.
  • Developed a mobile-first public verification page (/p/:code) with <1s load time, authentic certification badge, and tri-lingual i18n support (English, Hindi, Gujarati).
  • Designed a normalized 19-model PostgreSQL schema and 13 RESTful API controllers with Zod schema validation, Pino structured logging, Helmet security headers, and Swagger/OpenAPI documentation.
  • Implemented dual JWT authentication (15-min access + 7-day refresh tokens) with secure rotation and route-level role authorization guards.
  • Built a real-time scan telemetry pipeline capturing device fingerprints and geography, with AWS S3 asset storage and AWS SQS for asynchronous background tasks.

Technical Skills Canvas

1 / 4