Worked as a Backend Engineer at WhatBytes, building and scaling production-grade platforms across restaurant booking and food delivery domains. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Project: Venu (Restaurant Booking Platform) • Owned end-to-end backend development, building the platform across 9+ Django apps and 15–20 models from zero to production • Engineered and shipped 50+ REST APIs covering booking lifecycle, onboarding, pricing, and admin workflows using Django REST Framework and PostgreSQL • Designed a 5-stage booking lifecycle with audit history and state management for reliable booking flows • Architected concurrency-safe systems using DB transactions and row-level locking, eliminating double-booking under concurrent requests • Implemented RBAC (Admin, Restaurant Admin, User) with custom JWT authentication for secure, role-based access • Integrated AWS S3, Google Sign-In, OTP authentication, and transactional email systems for a complete production-ready backend • Optimized API performance by 30–40% by resolving N+1 queries using prefetch_related and database-level aggregations ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Project: Zentro (Food Delivery & Ordering Platform) • Developed 20+ REST APIs for order management, cart, checkout, and restaurant discovery • Integrated Stripe payments using Payment Intent and webhook handling for real-time transaction tracking • Implemented Firebase push notifications and Twilio OTP-based authentication flows • Built secure multi-role admin systems with scoped access control to prevent cross-entity data exposure • Designed APIs for order lifecycle tracking, retry mechanisms, and status handling ━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Impact • 70+ APIs shipped across platforms • 30–40% improvement in API performance • Built scalable backend systems handling real-world use cases