Full Stack Engineer

SumitraThawani.

React.js Node.js NestJS AI/LLM Azure

Building scalable enterprise systems with React, Node.js & AI integrations. 4+ years shipping production apps for global clients

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4+
Years experience
10+
Projects shipped
3
Hackathon wins
scroll
What I work with

Technical Skills

Frontend
UI Engineering
React.js TypeScript React Query Redux Toolkit WebSockets HTML5 / CSS3
Backend
Server & APIs
Node.js NestJS Express.js REST APIs Microservices Cron Jobs
AI & LLM
AI Integration
OpenAI API Claude API TTS ASR Prompt Engineering LLM Features
Databases
Data Layer
PostgreSQL MongoDB Redis Sequelize ORM Dataverse
Cloud & DevOps
Infrastructure
Microsoft Azure Docker Power Apps Power Automate Git
Concepts
Engineering Practices
JWT / RBAC Event-Driven Jest React Testing Library API Integration
Where I've worked

Experience & Impact

Feb 2025 — Present
Senior Software Engineer
Celebal Technologies
  • Architected scalable Node.js (NestJS/Express) backend services for enterprise approval workflows and file processing pipelines
  • Integrated AI models (OpenAI/LLM APIs) for natural language query handling and duplicate detection features
  • Built RESTful APIs connecting React frontends, Microsoft Dataverse, and Azure services including Teams integration
  • Enforced RBAC for multi-tenant applications; optimized performance via Redis caching and async processing
Jun 2021 — Feb 2025
Software Engineer — Full Stack
Wisflux Private Limited
  • Contributed to LACS, a large-scale social platform for a Japanese client — built social feeds, posts, one-to-one & group messaging, TTS and ASR features
  • Developed a DSP & SSP for Digital Out-of-Home (DOOH) advertising; built granular role-based + permission-based access control from scratch
  • Built microservices-based email notification service triggered by scheduled cron jobs for event-driven automation
  • Implemented Redis caching, WebSocket real-time features, Redux Toolkit state management, and PostgreSQL query optimization
  • Maintained test coverage using Jest and React Testing Library across multiple production codebases
Things I've built

Key Projects

01
💳
Subscription Manager & Reminder System
Full-stack platform to track subscriptions, EMIs and recurring payments. AI assistant answers natural language spend queries. Duplicate detection and cost-saving insights powered by LLM APIs.
React.js Node.js MongoDB OpenAI API Node-Cron
02
⚙️
File Processing & Automation System
Enterprise data processing platform for uploading and validating large datasets. Backend pipelines handle business rule validation, transformation and automated output generation at scale.
React.js Node.js PostgreSQL
03
💬
Real-Time Chat Application
JWT-authenticated real-time chat platform with multi-room support and instant WebSocket-based messaging. Scalable backend architecture with a fully responsive React frontend.
React.js Node.js WebSocket JWT
Let's connect
Open to opportunities

Currently exploring full-stack, backend, and AI-integrated engineering roles. Let's build something great together.

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