Backend-focused engineer specializing in distributed systems, performance engineering, and cloud-native architectures.

github

Avi Raj  • Peerlist

A smart, QR-based email automation tool I built to streamline personalized communication. It allows users to generate QR codes linked to dynamic email templates containing variables in the subject and body. When someone scans the QR code, they're prompted to fill out a form, and their responses are used to replace the placeholders. The user is then redirected to their email app with a prefilled, ready-to-send message. The system includes a real-time dashboard to monitor scans and submissions, built using Socket.io. The full-stack architecture is powered by React, Node.js/Express, Supabase for authentication and database, and Upstash Redis for fast, session-aware processing. Email delivery is securely handled via SMTP integration through Render.

QRVars

QueeTalk is a full-featured real-time chat application supporting both personal and group conversations. It was developed with a focus on speed, security, and seamless user experience, catering to over 200 users. The platform features two-factor authentication (TOTP), secure JWT-based sessions, and efficient Redis caching for socket connections. The user experience was enhanced by adding typing indicators, file sharing, emoji picker, and emoji reactions, improving engagement by 35%. Chatty achieved a message latency of under 200ms through Redis caching and file upload rate-limiting. It follows a clean Model-View architecture using Node.js and Socket.IO for real-time communication, with MongoDB as the primary data store. All media attachments are uploaded to and served from a Cloudflare R2 Bucket, ensuring fast and secure access.