Building a Frontend Framework from Scratch: Introducing Levelo JS

Saiful Siam — Thu, 11 Jun 2026 12:27:54 +0000

As developers, we often use frameworks every day without thinking much about how they work internally.

A while ago, I started exploring frontend architecture more deeply. I wanted to understand what happens behind components, state management, reactivity, and rendering systems.

That curiosity eventually led me to build my own frontend framework.

Today, I'm excited to share Levelo JS.

What is Levelo JS?

Levelo JS is a frontend framework built completely from scratch in JavaScript under the Motion Mind brand.

The framework is designed around a few core ideas:

No Virtual DOM
Signal-based reactivity
Small bundle size
SPA-focused architecture
Simple developer experience

Current core package version: levelojs v1.2.0

The ecosystem also includes a CLI tool:

npx create-levelo-app my-app

Why Build Another Framework?

The goal was never to create "the next React" or replace existing frameworks.

The real goal was to learn by building.

I wanted to understand:

How reactivity systems work
How rendering pipelines are designed
How state updates affect the UI
How framework architecture evolves from simple ideas

Building everything from scratch taught me far more than simply reading documentation ever could.

Signal-Based State Management

One of the core concepts in Levelo JS is signal-based reactivity.

A simple counter looks like this:

import { state } from 'levelojs';

function Counter() { 
  const [count, setCount] = state(0); 
  return ( 
    <div> 
      <h2>{count()}</h2> 
      <button onclick={() => setCount(count() + 1)}> Level Up ➔ </button>              
    </div> 
  ); 
} 
export default Counter;

The framework updates only what needs to change, without relying on a Virtual DOM.

Built Under Motion Mind

Levelo JS is being developed under Motion Mind, an initiative focused on next-generation software and AI solutions.

The vision behind Motion Mind is simple:

Build useful software.
Explore new ideas.
Share the journey through open source.

A Personal Milestone

One detail that makes this project special to me is how it started.

Up to version 1.0.4, Levelo JS was built entirely on an Android phone using Termux and acode.

What started as experimentation on a mobile device eventually grew into a complete open-source framework with its own CLI, documentation site, and ecosystem.

Explore Levelo JS

Documentation:
https://levelojs.motionmind.me/

GitHub:
https://github.com/MotionMind2007/Levelo-Js

Open for Collaboration

Levelo JS is open source and actively evolving.

If you're interested in frontend architecture, framework design, JavaScript internals, or open-source development, I'd love to hear your thoughts and feedback.

Every suggestion, discussion, and contribution helps move the project forward.

Thanks for reading.

DEV Community: Saiful Siam

Building a Frontend Framework from Scratch: Introducing Levelo JS