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Systems-Level Web Engineering with JavaScript

Build Production-Scale Systems from Scratch and Gain the Confidence to Get Hired

📅 March 2026⏱️ 12 weeks
৳5,500
৳7,500
Installment plans available: 2000 BDT per month

Your Instructor

Sakibur Rahaman

Sakibur Rahaman

Senior Software Engineer • 9+ Years of Experience

Specializing in full-stack development, cloud architecture, and microservices with expertise in React, Node.js, AWS, and Kubernetes. Passionate about teaching foundational concepts and helping developers build systems-level understanding.

What Is This Program?

An intensive technical program where you build production-scale web systems from scratch using JavaScript. You'll learn by doing—constructing a JavaScript runtime, a web browser, a UI framework, a backend server, a full-stack application, and an AI system.

This isn't about learning to use frameworks. It's about understanding how they work internally. You'll build the foundational systems that power modern web applications, gaining deep technical knowledge that most developers never acquire.

By building real systems from the ground up, you'll develop genuine confidence in your abilities. You'll understand why technologies behave the way they do, how to debug complex problems, and how to architect solutions—skills that directly translate to getting hired.

JavaScript is your tool for exploring core concepts: how code executes, how browsers render pages, how state is managed, how servers process requests, and how intelligent systems work. The language is the vehicle; systems understanding is the destination.

This hands-on, project-driven approach gives you the technical depth and practical experience that companies look for. You'll be able to explain how systems work, debug production issues, and build solutions with confidence.

How Would You Benefit From This Course?

  • Build 6 production-scale systems from scratch: runtime, browser, framework, server, full-stack app, AI system
  • Gain deep understanding of how web technologies actually work internally
  • Develop the confidence to tackle complex technical problems and unfamiliar systems
  • Master JavaScript through building real systems, not just following tutorials
  • Learn debugging, architecture, and problem-solving skills used in production
  • Stand out in technical interviews by explaining how systems work, not just how to use them
  • Build a portfolio of meaningful projects that demonstrate real engineering skills
  • Understand trade-offs and make informed technical decisions
  • Gain the practical knowledge and confidence that gets you hired

Learning Philosophy

This program is built on core principles that prioritize deep understanding:

  • Six intensive projects building production-scale systems from scratch
  • Hands-on learning: write code, debug issues, solve real problems
  • Focus on understanding internal mechanisms, not just using abstractions
  • Progressive complexity: each project builds on previous knowledge
  • Emphasis on practical skills: debugging, testing, architecting solutions
  • Learn to think in systems, understand trade-offs, and build with confidence

Program Structure

The program consists of six major projects. Each project focuses on a different domain while reinforcing previously learned concepts.

1

JavaScript Runtime and Event Loop

Explore how JavaScript code is executed internally and build a strong mental model for reasoning about execution, timing, and concurrency.

Core Topics:

  • →Execution context and call stack
  • →Synchronous vs asynchronous execution
  • →Task queue and microtask queue
  • →Promise resolution and async/await behavior

JavaScript Fundamentals:

Variables and functionsExecution orderCallbacks and promisesError handling
2

Mini Web Browser

Understand the internal workings of a web browser through a simplified implementation, demonstrating how raw text transforms into visual output.

Core Topics:

  • →HTML tokenization and parsing
  • →DOM tree construction
  • →Basic CSS rule application
  • →Layout and rendering flow

JavaScript Fundamentals:

Objects and arraysLoops and conditionalsRecursionTree data structuresString processing
3

Custom UI Framework

Build a minimal component-based UI framework to understand why modern frontend frameworks behave the way they do.

Core Topics:

  • →Component architecture
  • →State management
  • →Re-rendering logic
  • →Hook-like behavior and closures
  • →Declarative UI patterns

JavaScript Fundamentals:

Closures and lexical scopeHigher-order functionsImmutabilityModules and code organization
4

Backend Framework and Authentication

Build a server framework from the ground up to understand server architecture and backend development fundamentals.

Core Topics:

  • →HTTP request and response lifecycle
  • →Routing and middleware
  • →RESTful API design
  • →Authentication and authorization
  • →Basic security considerations

JavaScript Fundamentals:

Asynchronous I/OError handling patternsEnvironment configurationWorking with Node.js APIs
5

Full-Stack Application

Integrate frontend and backend systems into a complete application, emphasizing product-level thinking and real-world architecture.

Core Topics:

  • →Frontend-backend communication
  • →Data modeling and persistence
  • →State management across layers
  • →Feature design from end to end
  • →System-level trade-offs

JavaScript Fundamentals:

Data flow managementAPI integrationApplication architectureDebugging across systems
6

AI System and Intelligent Features

Understand how intelligence is derived from data and logic through practical AI implementations.

Core Topics:

  • →Text processing and tokenization
  • →Search, ranking, and recommendation logic
  • →Scoring and similarity calculations
  • →Integration of modern AI tools
  • →Limitations and evaluation of AI systems

JavaScript Fundamentals:

Algorithmic thinkingData transformationWorking with external servicesEvaluation and iteration

Areas of Exposure

Throughout the program, you'll gain exposure in: JavaScript internals and language fundamentals, Browser behavior and frontend architecture, Backend systems and networking, Full-stack system design, and Applied AI concepts.