Hi, I'm Bhavsagar 👋
Frontend / Product Engineer | React · React Native · TypeScript · PWA
BS

About

Product-focused Frontend Engineer with 3.5 years of experience building scalable SaaS web and mobile platforms using React and React Native. Strong background in end-to-end product ownership, frontend architecture, performance optimisation, and UX-driven engineering — with hands-on experience integrating AI/LLM capabilities into production applications, subscription-based platforms used by 10K+ daily users.

Work Experience

P

Prospello Technologies

March 2025 - Present
Frontend Developer
Bangalore, Karnataka
• Led frontend and mobile development across multiple production-grade SaaS platforms — owning architecture, delivery, and UI/UX decisions end-to-end. • Designed and built large-scale multi-role platforms (Students, Trainers, Admins, Medical Professionals, Department Heads) featuring real-time video, scheduling, dashboards, and role-based access control. • Built real-time video workflows using LiveKit SDK and Zoom Video SDK — session scheduling, meeting orchestration, and interactive classroom experiences. • Developed React Native mobile app using Expo, later ejected to Native CLI for deeper integrations including Zoom SDK, push notifications, and device-level features — reducing crash rate by ~70%. • Integrated production AI/LLM features into the LMS — built real-time streaming chat UI, RAG-based doubt resolution (Cohere + Groq), AI quiz generation, PDF lesson summarisation, and Whisper voice input, driving adoption across the entire active user base within two weeks of launch. • Converted platforms into Progressive Web Apps (PWA) enabling offline access and mobile-first experiences. • Drove performance optimisation — code splitting, lazy loading, memoisation, and TanStack Query caching improved LCP by ~35% and cut API calls by ~50%. • Owned UI/UX design and frontend architecture, driving usability, accessibility, and interface consistency across all platforms.
U

UpWork

Aug 2024 - Feb 2025
Freelance MERN Developer
Remote
Collaborated with international clients to deliver end-to-end MERN stack solutions. Worked on scalable dashboards, CMS systems, and B2B tools. Used TypeScript, GraphQL, and Docker to build and ship robust, containerized web apps. Focused on client satisfaction through rapid iteration and clean, modular code.
G

GeeksForGeeks

April 2024 - Aug 2024
Fullstack MERN Developer
Noida, Uttar Pradesh
• Built a full-stack e-commerce platform using React.js, Redux, Node.js, Express.js, and MongoDB — auth, product management, cart, and order flows delivered across agile sprints. • Introduced Formik and Yup for schema-based form validation, cutting form-related bug reports by ~80% and improving input reliability across all user-facing flows. • Collaborated on responsive UI components and REST API integration across a cross-functional team.
A

Allen Digital

July 2021 - Sept 2022
Frontend Developer
Kota, Rajasthan
• Built and maintained React interfaces for one of India's largest EdTech platforms, serving millions of students — optimised for low-bandwidth via code splitting, lazy loading, and RTK Query caching. • Delivered pixel-perfect, WCAG-compliant, cross-browser UIs — consistently passed QA within two revision cycles per feature. • Maintained code quality through Git branching workflows and peer code reviews across a multi-developer team.
S

Speedwell IT Solutions

June 2020 - June 2021
Frontend Web Developer
Noida, Uttar Pradesh
• Converted Figma and PSD designs into responsive, cross-browser websites for 10+ clients — managed direct client communication and delivered every project on schedule. • Standardised reusable component patterns, cutting average delivery time by ~25% across client projects.

Skills

OpenAI API
Claude API
Groq SDK
Cohere Embeddings
RAG Pipelines
Whisper Voice AI
Vercel AI SDK
Prompt Engineering
LLM Streaming
React
Next.js
React Native
Expo
TypeScript
JavaScript (ES6+)
Redux Toolkit
RTK Query
TanStack Query
Tailwind CSS
HTML5
CSS3
Responsive Design
Mobile-First Design
Accessibility (WCAG)
Design Systems
Component Architecture
Figma
Framer Motion
GSAP
Radix UI
shadcn/ui
Material UI
Node.js
Express
MongoDB
Mongoose
REST APIs
Razorpay
Stripe
LiveKit SDK
Zoom Video SDK
Push Notifications
PWA
Performance Optimization (LCP, CLS, INP)
Code Splitting
Lazy Loading
Memoization
API Caching
Docker
Git
Vercel
AWS
My Projects

Check out my latest work

I've worked on a variety of projects, from simple websites to complex web and Mobile Apps. Here are a few of my favorites.

AI LMS Tutor

AI LMS Tutor

Built a production-style AI learning platform with real-time LLM streaming, AI-generated quizzes, lesson summarization, smart notes, and document Q&A using a custom RAG pipeline (PDF ingestion → semantic chunking → Cohere embeddings → cosine similarity → Groq inference). Focused on low-latency responses, structured prompt design, and scalable retrieval beyond single API-call demos Implemented real-time streaming using server-sent events (SSE) for responsive chat UX Designed RAG pipeline with semantic chunking and similarity-based retrieval Optimized response latency by batching embedding and retrieval operations

Next.js
Node.js
Groq SDK
Cohere Embeddings
RAG (Chunking + Retrieval)
LLM Streaming
Whisper (Speech-to-Text)
Vercel AI SDK
React Native Mobile App

React Native Mobile App

Production React Native app for a wellness brand with 500K+ Instagram followers. Built for multiple user roles — Members, Trainers, Department Heads, and Medical Professionals. Features health tracking (water, sleep, steps), period cycle tracking, care team management, session scheduling, real-time appointment booking, and urgency-based request management. Designed UI/UX from scratch with no Figma designer.

React Native
Expo 54
TypeScript
Expo Router
TanStack Query
React Hook Form
Zod
Zoom Video SDK
Clerk Authentication
Razorpay
React Native Reanimated
Expo Notifications
Expo Camera
React Native Health Connect
React Native Calendars
Lottie Animations
Expo AV
REST APIs
Role-Based Access Control
Fitness Admin CRM

Fitness Admin CRM

Production Admin CRM powering the Fitness mobile app for a wellness brand with 500K+ Instagram followers. Admins manage memberships, payment collection, batch creation, class scheduling, user engagement, fee tracking, and reports — all reflected in real-time on the React Native mobile app. Designed complete UI/UX from scratch with no Figma designer.

React 19
TypeScript
Vite
Redux Toolkit
RTK Query
TanStack Query
TanStack Table
Tailwind CSS v4
MUI v7
React Hook Form
Recharts
Axios
React Router v7
Razorpay
Node.js
MongoDB
JWT Authentication
Role-Based Access Control
REST APIs
Learning Management System (LMS)

Learning Management System (LMS)

Full ownership side project: complete frontend architecture, UI/UX design, backend APIs, authentication, role-based access control, and data modeling using React and Node.js.

React
TypeScript
Vite
Redux Toolkit
React Router
Tailwind CSS
Radix UI
Framer Motion
GSAP
Node.js
Express
MongoDB
Mongoose
JWT Authentication
bcrypt
REST APIs
Axios
Digital Marketing Webiste

Digital Marketing Webiste

Built a responsive digital marketing website using React, featuring smooth navigation, dynamic components, and modern UI with TailwindCSS and Daisy UI

React
React Router
Daisy UI
TailwindCSS
JavaScript
Shadcn UI
Magic UI
Lazy Loading
Admin Dashboard

Admin Dashboard

Built a fully responsive admin dashboard, featuring a clean and modern user interface. The dashboard includes intuitive navigation, interactive data tables, customizable widgets, and detailed analytics displays to streamline data management and enhance user experience.

Typescript
HTML
TailwindCSS
Responsive Design
Data Management
Workflow Builder with ReactFlow

Workflow Builder with ReactFlow

Built a pipeline builder using ReactFlow, Python, and FastAPI to help users design and visualize workflows. It features dynamic text nodes with variable support, real-time DAG validation, and a polished, user-friendly interface.

React
React Flow
Python
FastAPI
TailwindCSS
Real-Time Feedback
DAG Validation
Dynamic Node Interactions
Contact

Get in Touch

Want to chat? Just shoot me a dm with a direct question on twitter and I'll respond whenever I can. I will ignore all soliciting.