Master Technical Interviews the JavaScript Way

Unlock in-depth knowledge and practical skills to ace your coding interviews with confidence. Tailored specifically for JavaScript and TypeScript engineers.

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merge-intervals.js
function mergeIntervals(intervals) {
  if (!intervals.length) return intervals;
  intervals.sort((a, b) => a[0] - b[0]);
  let result = [intervals[0]];
  for (let i = 1; i < intervals.length; i++) {
    let prev = result[result.length - 1];
    let curr = intervals[i];
    if (prev[1] >= curr[0]) {
      prev[1] = Math.max(prev[1], curr[1]);
    } else {
      result.push(curr);
    }
  }
  return result;
}
JavaScript-First Platform

Finally, Interview Prep Built for JavaScript Engineers

Stop forcing yourself through generic algorithm courses. Master both data structures & algorithms and advanced JavaScript concepts in one cohesive platform designed specifically for modern web developers.

480+
JS Problems
15+
Core Topics
Real
Interview Questions

No More Context Switching

Learn algorithms through JavaScript instead of pseudocode. Every data structure implemented with modern ES6+ syntax you actually use at work.

Map(), Set(), WeakMap()

Interview-Tested Examples

Practice with actual questions from Google, Meta, Netflix interviews. Learn the specific JavaScript patterns interviewers expect to see.

async/await patterns

Beyond LeetCode

Master advanced JavaScript concepts like closures, prototypes and event loops that separate senior engineers from juniors.

this binding, hoisting
Complete Learning System

Two Learning Tracks, One Interview Victory

Why choose between algorithms OR JavaScript mastery? This dual-track approach ensures you excel at both. The perfect combination that top companies actually test for.

The interview gap is real: algorithm knowledge without JavaScript fluency leads to buggy implementations. JavaScript expertise without algorithmic thinking leads to inefficient solutions. Master both, ace any interview.

1Track 1: JS Track

Master Modern JavaScript Fundamentals

Build unshakeable foundations in JavaScript concepts that separate senior engineers from the rest. From closures to async patterns, master what interviewers actually test.

01

Core Fundamentals

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02

TypeScript Introduction

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03

Frontend Development

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04

Advanced Concepts

Learn →

Complete this track to confidently explain any JavaScript concept in interviews

2Track 2: DSA Track

Conquer Data Structures & Algorithms

Learn algorithms the JavaScript way. No more translating from pseudocode. Implement efficient solutions using modern JS patterns and data structures.

01

Built-In Data Structures

Learn →
02

User-Defined Data Structures

Learn →
03

Common Techniques

Learn →
04

Advanced Topics

Learn →

Complete this track to solve complex algorithmic challenges efficiently

Personal Approach

What makes this approach different

Built from personal experience solving the gaps I found in my own interview preparation journey

Real-World Examples

Each lesson includes practical examples and common pitfalls from actual development and interview experiences.

Interview-Focused

Content designed specifically for technical interviews, helping you explain concepts clearly and effectively.

Learn from Mistakes

Documented common errors and pitfalls to help you avoid the same mistakes during interviews.

Practical Context

Understand not just how algorithms work, but when and why to apply them in real development scenarios.

Advanced Topics

Beyond basics - covering sophisticated algorithms and modern JavaScript patterns most courses skip.

“I used Memoized to prep for my Microsoft interviews. The pattern-based approach helped me finally see how problems connect.”

Nick Yenin
Nick YeninSoftware Engineer at Microsoft
100% Accessible

480+ problems are free to solve

Every coding problem, first section of every course and all related resources. No credit card required, no hidden costs. Just start learning today.

All Problems Free

480+ coding challenges accessible to everyone

Free Course Sections

First section of every course, no sign-up needed

Free Resources

Learning materials, guides and references included

Top Tech Companies

Modern Technical Interviews Require Both Skills

Whether you're interviewing at tech giants or growing startups, you'll need to demonstrate both algorithmic problem-solving abilities and deep JavaScript knowledge. This platform helps you master both aspects, preparing you for the complete interview experience.

Trusted by engineers at companies like:

Practice problems interface
450+ Problems

Solve Problems That Matter

Access over 450 diverse practice problems and questions designed to prepare you for real interview scenarios.

Categorized by Topic

Each problem is categorized and aligned with lessons, ensuring targeted and effective practice.

Progressive Difficulty

Problems range from beginner to advanced levels, helping you build and strengthen skills progressively.

Build Confidence

Regular practice reinforces concepts, improves problem-solving skills, and boosts interview confidence.

Progress tracking dashboard
Progress Analytics

Track Your Progress Visually

Memoized provides detailed analytics to track your progress as you complete lessons and solve problems.

Achievement Tracking

See your achievements and identify areas for improvement with detailed progress insights.

Learning Journey

Stay motivated by visualizing your learning journey and achieving your goals more efficiently.

Regular Updates

New content and features added regularly, giving you access to the latest tools for interview success.

Mario Siric, creator of Memoized
Meet the Creator

Hello, I'm Mario, creator of Memoized

As a Senior Software Engineer at Microsoft with years of experience interviewing candidates and mentoring developers, I noticed a gap in how engineers prepare for technical interviews. Most platforms focus on either algorithms or JavaScript concepts, but rarely both.

Through my experience both giving and taking technical interviews, I've learned what makes candidates successful. I've structured this platform to focus on what actually matters: strong algorithmic thinking and deep JavaScript knowledge.

This isn't just another course platform, but the comprehensive resource I wish I had when I was preparing for interviews at top tech companies.

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