Ujjawal

Singh

Senior Full-Stack Engineer

Enterprise SaaS & AI

New Delhi, India

My Journey

My journey as a Full Stack Web Developer

Senior Full-Stack Engineer

Aug 2025 - Present

AppTestify

Leading the development of an enterprise multi-tenant SaaS platform with authentication, hierarchical RBAC, subscription billing, AI-powered features, workflow automation, reporting, notifications, and core platform services. Responsible for system architecture, backend development, API design, AI integrations, and building scalable event-driven systems.

Full-Stack Engineer

Nov 2023 - Aug 2025

The Yarn Bazaar

Developed enterprise web and mobile applications while leading initiatives around CRM automation, AI-powered knowledge retrieval, and internal productivity tools. Built end-to-end features, modernized legacy systems, and delivered solutions that streamlined operations, improved customer engagement, and reduced manual effort.

Full-Stack Developer Intern

Aug 2023 - Oct 2023

The Yarn Bazaar

Completed a three-month internship focused on React, Node.js, MongoDB, and enterprise application development. Contributed to production features, collaborated closely with the engineering team, and earned a full-time role based on performance.

QUASR+

(Aug 2025 - Present)

An enterprise multi-tenant SaaS platform providing authentication, hierarchical RBAC, subscription management, AI-powered workflows, reporting, notifications, and extensible platform services for large organizations.

Next.jsTypeScriptMongoDBOpenAI

Bandhu

(Aug 2023 - Jan 2025)

A three-sided platform serving buyers, vendors, and internal ops teams — combining a mobile app, WhatsApp-based price updates via LLM, real-time pricing, an operations system for managing events and clients, and a Slack-integrated AI workflow.

+6FlutterFastAPITypeScript

Event Reach

(Sep 2025 - Oct 2025)

A multi-channel event invitation platform enabling teams to send and manage automated Email and WhatsApp invites across multiple events.

TypeScriptAWS LambdaMongoDBVercel