Senior Full Stack Developer at Prael la Private Limited

Owned backend architecture for Shopify Plus merchants across 10+ stores in the US and Canada. Led Shopify migrations from multiple platforms, transforming 15–20M+ records using Python automation. Designed and built 30+ custom Shopify apps using Admin APIs, Storefront APIs, and Webhooks. Developed Shopify Extensions for customer-specific pricing logic based on postal code zones. Built a custom shipping API handling 15,000–20,000 orders with real-time charge updates. Created Shopify Flow to automate Recharge subscriptions and prepaid orders, processing approx. 5,000 orders/month. Architected a B2B custom Shopify app with role-based access serving 80,000+ orders/month. Implemented session-based authentication for Shopify Admin and customers supporting high-concurrency requests.

Software Engineer – Backend at Callphone Limited

Architected and maintained backend services for 100+ merchants handling high-volume transactions. Designed automated and manual settlement workflows processing $50K+ USD per week. Built and scaled Redis queues handling 40,000+ background tasks, improving performance by 40%. Developed event-driven real-time notifications using background workers and Firebase. Implemented secure authentication, RBAC, and strong API validation layers. Built a microservice for file upload and retrieval on AWS S3, handling 5,000+ requests per day. Owned production support for critical KYC, settlement, and payment issues.