Hi, I'm Smith Kashyap

Overview.

A results-driven and passionate Full Stack & Mobile Developer with 9+ years of hands-on experience in building scalable, performant applications across fintech, eCommerce, CRM, and enterprise domains. Proven expertise in React Native, React.js, Node.js, and MongoDB, with a strong grasp of mobile-first development, secure API design, and cloud-native practices.

Key Highlights:

🚀 Reduced mobile app crash rate by 40% through optimized error handling and crash reporting with Sentry & Flipper.

📱 Built and deployed 10+ React Native apps across Android and iOS with secure storage, SIM binding, and offline sync.

🔐 Developed end-to-end UPI payments system with QR scan, biometric auth, and mandate flow using secure APIs.

⚙️ Improved API performance by 35% using Redis caching, optimized MongoDB indexes, and rate limiting.

📊 Migrated legacy mobile architecture to modern Redux Toolkit + MMKV, leading to 30% faster state access.

✅ Created custom component generators with Plop.js, streamlining boilerplate creation and ensuring consistent folder structures.

✅ Applied a robust Git workflow using Husky + lint-staged to auto-format and validate code before every commit.

🌍 Led a team of 7 developers on a real-time fintech dashboard project used by 1M+ users.

🧾 Designed a GraphQL gateway to serve 3+ frontend clients with reduced over-fetching and improved maintainability.

📦 Implemented a modular microservices backend using Node.js & Express, reducing deployment time by 60%.

💡 Designed reusable UI systems with Tailwind CSS, decreasing frontend development effort by 25%.

📱 Developed cross-platform apps using React Native, Kotlin, and Java (Android SDK)

💡 Implemented search and analytics with Elasticsearch for high-performance querying.

📱 Experienced in setting up Fastlane pipelines for automated builds and leveraging Appium for end-to-end UI testing of cross-platform mobile apps.

📊 Proven ability to lead teams, communicate with stakeholders, and mentor junior developers

🌍 Delivered secure, payment-ready solutions using Stripe, Razorpay, and best auth practices

Languages & Databases

Frameworks & Libraries

Tools & DevOps

Unit Testing & QA

Projects.

React NativeReact.jsMongoDBKotlinAppiumNext.jsNode.jsExpress.jsReduxTailwind CSSCore JavaKotlinGraphQLJenkinsBit-Bucket

Airtel Thanks App | UPI | Payments

Led React Native development for UPI features, including AutoPay, QR Scan, mandate authorization, SIM-binding and secure flows using SSL pinning, SQL cipher, and more.

Ionic-capcitorAngularHTMLCSSTailwind-cssNode.jsMongoDBExpressJWTRedux

D1 Mobile App & DSM Admin Panel

Full-stack Fintech solution with real-time dashboards, JWT authentication, RBAC, and backend API protection. Developed using MERN + React Native.

React.JSNext.jsNode.jsMongoDBJestREST APIsReduxTailwind CSSExpress.jsRedisBull-MQ

Moglix - Supplier Central App

React Native-based app for supplier onboarding, reviews, likes, and location-based interaction. Used Jest for testing and RESTful services.

React NativeNode.jsMongoDBFirebaseGoogle MapsFFMPEGSocket.ioExpress.jsReduxTailwind CSSMUIJestReact.JS

Trackit LLC

Built accident, attendance & location tracking system with real-time chat, FFMPEG video logs, Google Maps integration, and admin dashboard.

React NativeReduxJavaScript ES6Node.jsExpress.jsMongoDBTailwind CSSJestApollo GraphQLRedisBull-MQElastic-Search

Akalat Food Delivery App

Zomato-style food delivery app for the Arab region. Core features: ordering, search, filters, real-time location tracking, and secure payments.

Node.jsExpress.jsMongoDBTailwind CSSJestApollo GraphQLRedisBull-MQElastic-SearchReact NativeZustandRedux-toolkit

ValCRM

CRM app with meetings, calls, SMS, email, lead and contact management under one mobile dashboard. Integrated payment and third-party libraries.

React.jsTailwind CSSAndroidiOSNode.jsExpress.jsPostgreeSQLGitLabHTMLCSSJavaScript ES6TypeScriptReact Native

Fantricks Fantasy Cricket Game

Developed a cross-platform fantasy cricket game for Fantricks India Pvt. Ltd. with complete frontend, mobile app, and backend integration. Supported both Android and iOS with real-time match logic and user interaction.

Next.jsTailwind CSSLamda-serverlessAWS-SESHTMLCSS

My Portfolio

My portfolio features a collection of projects that reflect my commitment to delivering top-tier web solutions. I take pride in developing user-friendly and efficient applications.

Work Experience

Senior Consultant

EY (Ernst & Young)

Dec 2022 – Present

React NativePlop.jshuskylint-stagedAppiumFastlaneNode.jsMongoDBGraphQLReduxExpress.jsNext.jsTailwind CSSMUIJestEnzymePostmanSwagger

Advanced skills in React.js for building dynamic web applications.
Led a team of 7 developers for Airtel Payments Bank in the UPI vertical.
Oversaw sprint planning, bandwidth allocation, and Agile delivery using JIRA.
Built secure UPI payment features including QR scan, mandate flow, biometric auth.
Expertise in Redux for efficient state management.
Worked on UPI features and mobile-first financial user journeys.
Experience with Formik and Yup for seamless form handling and validation.
Client Project: Airtel Thanks App — enhanced with AutoPay, SQLCipher, Secure Storage, multithreading, and SIM-binding.

Software Developer II

FIS Global

May 2021 – Dec 2022

React NativeReact NativeReact.jsMongo-DBNext.JSExpress.jsNode.js

Proficient in Material UI for creating modern and responsive user interfaces.
Skillful use of Tailwind CSS to streamline and enhance UI styling.
Built fintech dashboards and mobile apps using React Native and Node.js.
Integrated REST APIs with JWT auth and MongoDB transaction flows.
Experience in using MongoDB and Mongoose, including the strategic use of indexing, for efficient data modeling, storage, and retrieval.
Skillful use of Postman for API testing, validation, and swagger for API documentation.
Expertise in error handling, debugging, and performance optimization.
Client Project: D1 Mobile App & Admin Panel — real-time finance UI, JWT/Bcrypt auth, RBAC, rate-limiting.

Senior Software Developer

Debut Infotech

Sep 2020 – Apr 2021

React NativeReact.jsMongo-DBNext.JSNode.js

Led React Native mobile app development and backend APIs using Node.js.
Client Project: Moglix Supplier Central App — comment system, likes, location features, built with React Native and REST APIs.

Software Developer

Softobiz Technologies

May 2018 – Sep 2020

React NativeReact.jsMongo-DBNode.js

Developed scalable mobile apps and backend APIs for global clients.
Client Project: Trackit LLC — accident & attendance tracking with Google Maps, Firebase chat, FFMPEG, and real-time communication.

Android Application Developer

NetSet Software Solutions

Sep 2017 – May 2018

AndroidKotlinJava

Developed Android apps with MVVM/MVP, Kotlin, and Core Java.
Implemented offline caching and performance optimizations.

Android Developer

Vibrant Appz

Oct 2015 – Sep 2017

AndroidJavaKotlin

Developed Android apps using Kotlin/Java and SQLite.
Applied best practices and optimized for performance.