Hi, I'm Abhay

Senior Software Engineer

5+ years building scalable web, mobile, backend, and applied AI systems across EdTech and FinTech. Strong expertise in React, React Native, Node.js/NestJS, AWS, and real-time systems, with hands-on experience delivering RAG-based assistants, conversational AI workflows, call-scoring systems, and predictive ML solutions in production environments.

Abhay Upadhyay - Software Engineer

Experience

5+ years building scalable web, mobile, backend, and applied AI systems across EdTech and FinTech.

Software Development Engineer – II

Current

Digiaccel Learning Private Limited

July 2024 - PresentGurgaon, India
  • Built and scaled a full-stack LMS across web and mobile, including backend APIs, auth flows, and data models in NestJS.
  • Shipped a reels-style short-form learning app in React Native with streaks, completion tracking, and quizzes.
  • Designed real-time conversational AI systems — a sales pitch coach and an AI interview simulator — using the OpenAI Realtime API, LiveKit, WebSockets, and WebRTC.
  • Built RAG-based assistants and an AI call-scoring system to standardize sales quality reviews.
NestJS
React Native
OpenAI Realtime API
LiveKit
RAG
AWS

Senior Software Engineer

Omnifi AI Technology (ArthmateTech)

August 2023 - June 2024Gurgaon, India
  • Led development of 1Invest, a cross-platform P2P investment app in React Native, letting users invest, track returns, and manage portfolios.
  • Built scalable serverless backend systems with Node.js and AWS (Lambda, API Gateway, RDS).
  • Developed an IFA dashboard in React.js with analytics and BI reporting to improve advisor productivity.
  • Built an AI-powered chatbot for financial queries and customer support.
React Native
Node.js
AWS Lambda
React.js

Software Engineer

ArthmateTech Private Limited

September 2021 - July 2023Gurgaon, India
  • Built partner dashboards in React.js for Ceplr, a financial data access platform, for business decision-making.
  • Developed secure, compliant consent journeys with Next.js for financial data-sharing workflows.
  • Engineered serverless backend APIs with Node.js, AWS Lambda, and API Gateway for scalable processing.
React.js
Next.js
Node.js
AWS Lambda

Software Engineer Intern

OnsCabs Private Limited

January 2021 - June 2021New Delhi, India
  • Developed a ride-hailing mobile application in React Native for passengers and drivers.
  • Implemented real-time ride tracking, fare negotiation, and messaging features.
  • Utilized Firebase Firestore, Cloud Functions, Realtime Database, Analytics, and Cloud Messaging.
React Native
Firebase

Technical Skills

I work with modern technologies across the full stack. Here's my expertise organized by category.

Languages

JavaScriptTypeScriptPythonJavaC

Frontend (Web)

React.jsNext.jsHTMLCSS

Mobile

React Native (Android & iOS)Native ModulesExpoFlutter

Backend

Node.jsNestJSExpress.jsServerless Architectures

Databases

MySQLMongoDB

Cloud & DevOps

AWS LambdaAPI GatewayS3SQSRDSCloudWatchCognitoAmplifyFirebaseCI/CD

AI / ML

RAGLLM IntegrationsConversational AIPrompt EngineeringCall Scoring SystemsPredictive ModelingVector SearchOpenAI Realtime APILiveKit

APIs & Architecture

REST APIsWebSocketsWebRTCHLDLLDEvent-Driven SystemsRBACAsync Processing

Tools & Testing

GitAWS CodeCommitAndroid StudioUnit TestingAPI Testing

Services

I offer comprehensive development services to help bring your digital ideas to life with modern, scalable solutions.

Web Development

Custom web applications built with React, Next.js, and modern frameworks. Responsive, fast, and optimized for performance.

  • Responsive Design
  • Performance Optimization
  • SEO Friendly

AI & Automation

AI-powered assistants and applied ML systems — RAG-based retrieval, conversational AI, LLM integrations, and real-time voice agents built for production.

  • RAG-Based Assistants
  • Conversational AI
  • LLM Integrations

Backend Development

Robust APIs and server-side applications using Node.js, Python, and cloud services for scalable solutions.

  • RESTful APIs
  • Database Design
  • Cloud Deployment

Real-Time Systems

Low-latency real-time features — voice AI, live streaming, and event-driven communication using WebSockets, WebRTC, and the OpenAI Realtime API.

  • Real-Time Voice AI
  • WebSocket APIs
  • Low-Latency Streaming

Mobile Development

Cross-platform mobile applications using React Native and Flutter for iOS and Android platforms.

  • Cross-platform
  • Native Performance
  • App Store Ready

Cloud Services

Cloud architecture and deployment using AWS, Docker, and modern DevOps practices for reliable infrastructure.

  • AWS/Azure Setup
  • CI/CD Pipelines
  • Auto Scaling

System Architecture & Design

High- and low-level system design for scalable, event-driven applications — from API contracts to distributed architecture.

  • HLD & LLD
  • Event-Driven Architecture
  • Scalable APIs

SEO Optimization

Technical SEO implementation and performance optimization to improve search rankings and user experience.

  • Technical SEO
  • Page Speed
  • Core Web Vitals

Consulting

Technical consulting and code reviews to help optimize existing projects and guide technology decisions.

  • Code Reviews
  • Architecture Planning
  • Team Training

Featured Projects

Here are some of my presonal projects that showcase my skills in full-stack development and modern web technologies.

Career Information Provider

Career Information Provider

A web app designed to guide school students toward their dream careers. It offers tailored information on subjects, courses, and top universities aligned with their career goals, bridging aspirations with actionable steps for a successful future.

HTMLCSSJavaScriptPHPMySQL
2019 - 2020
MERI PathShala

MERI PathShala

A learning platform for students to access recorded lectures when they miss classes. Teachers can manage academic records and activities, fostering collaborative learning and comprehensive academic management.

React NativeNode.js
2020 - 2021
Object Detection

Object Detection

A low-cost, offline application designed to make object detection and tracking-based surveillance systems accessible to everyone. Using computer vision, it analyzes and interprets images for efficient scene understanding.

React NativeTypeScriptTensorFlow
2021
Mediator

Mediator

A simple chatting application enabling user-to-user communication directly. There's no group chat feature, focusing on personal chats for effective, straightforward interactions.

React NativeFirebase
2021
Helicopter 2D

Helicopter 2D

A fun and engaging 2D game built to practice React Native skills and explore new development techniques. A creative way to improve while having fun!

React NativeJavaScript
2021
Tic Tac Toe

Tic Tac Toe

A simple implementation of the classic Tic-Tac-Toe (noughts and crosses) game, developed for fun and out of interest in game development. Play and challenge your friends!

React NativeJavaScript
2021

Let's Work Together

Ready to bring your ideas to life? Let's discuss your project and create something amazing together.

Get In Touch

abhayaku21@gmail.com

+91-9125957424

Somewhere in India

Let's Connect

Got a Project in Mind?

Whether it's a web application, mobile app, or consulting project, I'd love to hear about it.

Collaboration

Open to freelance work, consulting, and interesting collaboration opportunities.

Quick Turnaround

Fast response times and efficient project delivery to meet your deadlines.