Open to Specialist Roles 2026

Frontend Engineer & JS Specialist

Muhammad Jahanzaib

I build production‑grade systems, not just interfaces. Specialized in Next.js, React, React Native, and clean architecture. I simplify complex state, eliminate console errors, and optimize for real‑world performance.

Bundle size ↓32%
LCP < 2.5s
0 console errors
Discuss Your Project View Case Studies
Developer workspace

System Architect & Problem Solver

Beyond the UI

Muhammad Jahanzaib

I'm a Frontend engineer with a focus on Next.js, React , React Native, and scalable architecture. Over the past years, I've shifted my focus from building features to designing systems that are maintainable, performant, and resilient.

My approach is rooted in state simplification (recently replaced XState with Zustand in a production app to reduce complexity), error isolation, and performance budgeting. I believe in shipping code that works in production without console noise.

Architected design systems used across 4+ products
Improved Core Web Vitals (LCP < 2.5s) for enterprise apps
Cross‑platform mobile apps with React Native (CLI + Expo)
React React Native Next.js Zustand TanStack Query Three.js
Download CV (PDF)

Professional Journey

Where I've Made an Impact

Frontend Engineer

Appreex Systems

Jan 2025 – Present

Leading frontend architecture for enterprise dashboards. Migrated from Pages Router to App Router, reducing bundle size by 32%. Implemented Zustand for state management, cutting boilerplate by 50% and eliminating XState complexity.

Next.js ZustandTypeScriptTanStack Query

Javascript Developer (Contract)

DigitalAgency

Jan 2024 – Dec 2024

Developed a real‑time analytics dashboard with Next.js and WebSockets. Built a schema validation layer with Zod to ensure API contract reliability. Mentored junior devs on React performance patterns.

Next.jsWebSocketsZodRedux Toolkit

React Native Developer

WebStart Ltd.

Jun 2025 – Dec 2025

Built cross‑platform mobile app for field service management using React Native (Expo). Implemented offline‑first architecture with WatermelonDB and synced via Supabase.

React NativeExpoWatermelonDBSupabase

Technical Arsenal

Production‑Ready Expertise

Core Engineering

JavaScript (ES6+)TypeScriptClean Architecture Error BoundariesPerformance BudgetsSchema Validation (Zod)

Focus on maintainable systems, not just features. I design for long‑term scalability.

Frontend & Mobile

React Next.js (App Router)React Native Tailwind CSSShadcn/UIFramer MotionThree.js / R3F

State & Data

ZustandTanStack QueryRedux Toolkit RecoilFirebaseSupabaseWebSockets

Testing & DevOps

JestCypressPlaywright ESLint/PrettierGit/GitHub ActionsVercel/NetlifyDocker

Real‑World Impact

Featured Engineering

State Simplification Clean code on screen

Apology App (Next.js + Zustand)

Production‑grade apology generator with complex multi‑step forms. Replaced XState with Zustand to reduce boilerplate by 60% and eliminate runtime errors. Achieved zero console errors and 100% Lighthouse score.

Next.js ZustandTypeScriptTailwind
Live Demo Source
System Architecture System architecture diagram

AI Validation & Error Isolation System

Advanced frontend architecture featuring a schema validation engine, storage migration logic, and an error isolation tree. Includes performance budgeting and automatic bundle analysis.

ReactZodIndexedDBWeb Workers
Case Study Repository
Weather App

Weather Forecast Dashboard

Real‑time weather application built with Next.js and TypeScript, featuring server‑side rendering. Integrates multiple weather APIs with interactive maps and historical data visualization.

Next.jsTypeScriptSSRTailwind
Live Demo Source
E‑commerce

E‑commerce Platform

Full‑featured e‑commerce solution with React, Redux, and Node.js backend. Includes product catalog, cart, authentication, and payment integration. Optimized with lazy loading and code splitting.

ReactReduxNode.jsStripe
Live Demo Source
Task App

Task Management App

Productivity app with React and Firebase, featuring real‑time updates, drag‑and‑drop, and offline capabilities. Uses Firestore and JWT authentication.

ReactFirebaseDrag & DropPWA
Live Demo Source

How I Build

Engineering Mindset

System Over UI

I prioritize architecture that scales. State management, error boundaries, and data flow are designed before pixels.

State Simplification

I actively reduce complexity. Replaced XState with Zustand in production, improving team velocity and reducing bugs.

Error Isolation

Errors should never crash the app. I implement granular error boundaries and fallback UIs.

Performance Aware

I set performance budgets and monitor Core Web Vitals. Lazy loading, code splitting, and bundle analysis are standard.

Client & Colleague Feedback

Trusted by Teams

Muhammad led the migration from XState to Zustand on our enterprise dashboard. The result: 50% less boilerplate, zero new state‑related bugs, and a 32% reduction in bundle size. His architectural decisions saved us weeks of development time.
John Smith

John Smith

CTO, TechSolutions Inc.

Working with Muhammad was a turning point for our team. He introduced performance budgets, error boundaries, and a robust testing strategy. Our Core Web Vitals improved by over 40% within a month. He doesn't just write code—he elevates the engineering culture.
Sarah Johnson

Sarah Johnson

Product Manager, DigitalAgency

Muhammad architected our offline‑first React Native app. The sync engine he built with WatermelonDB and Supabase is bulletproof. Even with flaky network, our field agents never lose data. His understanding of mobile constraints is exceptional.
Michael Chen

Michael Chen

Director of Engineering, StartupX

Get In Touch

Contact Me

Email

m.jahanzaibjameel@gmail.com

Phone

+92 308 3954920

LinkedIn

linkedin.com/in/jahanzaib

GitHub

github.com/JahanzaibJameel