Senior Software Engineer focused on building scalable, high-performance frontend systems and cross-platform applications.

I specialize in React, React Native, Angular, and modern web architecture, with hands-on experience delivering enterprise products, leading migrations, and building full-stack products from scratch. My work emphasizes performance, accessibility, maintainability, and pragmatic engineering.

• Senior Software Engineer at TechM (Microsoft engagement)
• 5+ years in frontend and mobile engineering
• Experience leading Angular → React migrations at scale
• Builder of production mobile and web platforms
• Founder and developer of TatvaFit, a gym management platform in pilot with real customers
• Strong interest in clean architecture, Web3 interfaces, PWAs, and developer experience

• Frontend system design and architecture
• React and React Native performance optimization
• Cross-platform engineering
• Accessibility-first UI development (WCAG)
• Design systems and reusable component libraries
• Shipping real products end-to-end

Feb 2024 – Present

• Led migration of a major web platform from Angular to React.
• Built PWAs and cross-platform mobile apps with 95% shared codebase.
• Designed complex UI systems using FluentUI and internal design libraries.
• Implemented Redux-based state architectures across large feature sets.
• Drove accessibility initiatives across web applications.
• Built CI/CD pipelines using Azure DevOps YAML workflows.

Jan 2022 – Feb 2024

• Delivered high-performance React Native and PWA applications.
• Built native modules in Swift and Kotlin.
• Optimized rendering and startup times using Flipper and RN debugging tools.
• Implemented Web3 wallet integrations and smart-contract driven UI flows.
• Led junior engineers and cross-functional delivery.

Sep 2020 – Jan 2022

• Built responsive web and mobile platforms.
• Developed backend services using NestJS and Node.js.
• Designed REST APIs and integrated PostgreSQL and MongoDB.
• Focused on reusable UI components and frontend performance.

Founder and Lead Developer

A full-stack mobile application for gym owners to manage memberships, payments, and attendance.

• Built with React Native, TypeScript, Supabase, Expo, Zustand, SQL
• Designed and implemented the complete system architecture
• In pilot with 10+ gyms
• Reduced payment tracking effort by 80%
• High adoption during early rollout

Landing page: https://tatvafit.mangalcore.com

Frontend

• React, React Native, Angular, Next.js
• Redux, RxJS, Zustand
• Tailwind, Bootstrap, NativeBase
• D3, Recharts, Mapbox

Backend

• Node.js, NestJS
• REST APIs
• PostgreSQL, MongoDB

Mobile

• Expo, React Navigation
• Native Modules (Swift, Kotlin)
• AsyncStorage

Web3

• Wallet integrations
• ethers.js, Web3.js
• DApp UI architecture

Tooling

• Azure DevOps, GitHub
• Webpack, Jest, Detox
• Flipper, RN Debugger
• Figma
• Agile, Scrum

Occasionally share thoughts on engineering, frontend architecture, and product building:

https://mangalcore.com

• LinkedIn: https://linkedin.com/in/harimangalp
• Email: contact@mangalcore.com OR harimangal.pandey@outlook.com

Building reliable systems. Shipping real products. Optimizing for scale.