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
Community & Speaking

Workshops & Sessions

Conducted training sessions and workshops on Full Stack Development and AI integration at leading institutions. Sharing knowledge with students and professionals on building scalable applications and implementing modern AI features.

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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