Hello, I'm

Vishal Kumar Roy.

I build cross-platform mobile & web apps.

Full Stack Engineer specializing in React Native, React, Node.js, and TypeScript. Currently Founding Engineer at KLYM.

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01 — About

Get to know me

I'm a Full Stack Engineer with 2+ years of experience shipping cross-platform mobile and web applications in fast-paced startups. I currently work at KLYM as a Founding Engineer, where I architect a React Native app and the Node.js backend powering real-time consultations and video sessions.

Before KLYM, I worked at Factory Kaam, shipping a React Native + Expo app to iOS, Android, and web with NativeWind and a full EAS release pipeline, plus REST integrations and an internal ATS tool. I enjoy owning features end-to-end — from API design to pixel-polished UI — and collaborating closely with designers and product.

I hold a B.Tech in Mechanical Engineering with a minor in Computer Engineering from Delhi Technological University (8.8 CGPA). Outside of work I build side projects, grind LeetCode, and occasionally show up to hackathons.

02 — Experience

Where I've worked

  1. Founding Engineer

    Jul 2025 — Present

    KLYM Gram AI Technologies Pvt Ltd · Delhi, IN

    • Leading end-to-end development of a cross-platform mobile app in React Native, TypeScript, and Node.js (Express), shipping signed builds to the App Store and Google Play via EAS Build & Submit.
    • Architected the frontend for real-time consultations and video sessions; defined component structure, navigation, and state patterns from scratch.
    • Implemented secure OAuth flows and analytics / push-notification integrations (Pushwoosh, GA); shipped OTA updates with EAS Update.
    React NativeTypeScriptExpoNode.jsEASOAuth

  2. App Developer Intern

    May 2024 — Jul 2025

    UdyogTech Ventures (Factory Kaam) · Delhi, IN

    • Led frontend development of Factory Kaam's cross-platform app in React Native, Expo, and TypeScript, shipping consistently to iOS, Android, and web.
    • Designed responsive UI components with NativeWind (Tailwind) and implemented type-safe navigation using Expo Router.
    • Integrated RESTful APIs via Axios and built an internal Applicant Tracking System that improved recruiter efficiency by 150%.
    • Automated CI/CD with EAS Build and managed App Store + Play Store releases; added multi-language support (Hindi, English) with a scalable i18n pipeline.
    React NativeExpoNativeWindExpo RouterAxiosi18n

  3. Frontend Developer Intern

    Dec 2022 — Mar 2023

    Scientific Society, AIIMS Delhi · Delhi, IN

    • Engineered scisocaiims.com from concept to deployment — a responsive, accessible frontend in HTML, CSS, and JavaScript that attracted over 14,000 new users.
    • Developed the primary landing pages for the annual 'Insight' fest, driving 24,500+ combined page views across event sections.
    • Optimized website performance for fast load times and strong SEO rankings, increasing organic traffic and visibility.
    HTMLCSSJavaScriptResponsiveSEO

  4. Summer Research Intern

    Jun 2024 — Aug 2024

    DRDO — Solid State Physics Laboratory · Delhi, IN

    • Ran MatLab simulations on cryochamber geometries, targeting 6–7s cooldown at 300 K ambient for military night-vision cameras.
    • Supported experimental setups under senior scientists and authored technical reports documenting procedures and findings.
    MatLabSimulationResearch

03 — Skills

Things I work with

Languages

JavaScriptTypeScriptHTMLCSSPythonC/C++SQLMatLab

Frameworks

ReactReact NativeNext.jsNode.jsExpressSocket.IO

Styling & UI

Tailwind CSSNativeWindBootstrapResponsive DesignAccessibility

Tools & Platform

ExpoExpo RouterEAS BuildGit / GitHubAxiosZodZustandReact Flow

Databases

MongoDBMySQLSQLitePrisma

Other

OAuthREST APIsCI/CDApp Store / Play Storei18nPushwooshGA

04 — Projects

Things I've built

AI

AI Workflow Builder Weavy-style

Full-stack visual workflow builder with a drag-and-drop canvas powered by React Flow. Custom Text, Image, and LLM nodes with multimodal Gemini + Imagen integration, Prisma persistence, and 20-step undo/redo via Zustand.

Next.js 16React 19TypeScriptReact FlowPrismaGemini
Code →
FIT

Fitness Tracking App

All-in-one workout and macro tracker in React Native with progressive-overload tracking and USDA food-database search. Interactive charts for daily fitness progress and automated diary entries for logged workouts and meals.

React NativeExpoChartsUSDA API
Code →
C4

Online Multiplayer Connect Four

Real-time multiplayer Connect Four with a React frontend and a Node + Express backend. Socket.IO drives instant move synchronization plus real-time opponent cursor tracking for an interactive feel.

ReactNode.jsExpressSocket.IO
Code →
AIIMS

scisocaiims.com

Responsive, accessible website for the Scientific Society of AIIMS Delhi, built from scratch in HTML, CSS, and JavaScript. Attracted 14K+ new users and drove 24.5K+ page views across the 'Insight' fest event pages.

HTMLCSSJavaScriptSEO
Live →

05 — Contact

Let's build something

Got a role, a project, or just want to say hi? Drop a message below and I'll get back to you.