CRACK LLD INTERVIEWS WITH THIS PROVEN DESIGN COURSE

Crack LLD Interviews with This Proven Design Course

Crack LLD Interviews with This Proven Design Course

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If you're aiming to crack SDE interviews or level up your software design skills, mastering Low Level System Design (LLD) is essential. In 2025, with increasing competition for tech jobs and rising expectations for scalable, maintainable software, choosing the best online course for Low Level Design can be a game-changer in your tech career. Low level system design course

This guide reviews top-rated LLD courses, what makes them stand out, and how to pick the right one based on your career stage.

Why You Need an LLD Course in 2025

While most developers know how to write functional code, only a few can design software that’s clean, modular, and extensible. That’s where Low Level System Design comes in.

Key Benefits of Learning LLD:

  • ✅ Crack SDE-1/SDE-2 interviews at FAANG and startups

  • ✅ Build real-world-ready applications using OOP and design patterns

  • ✅ Gain confidence in code reviews, architecture discussions, and cross-team projects

  • ✅ Learn to think like a software architect, not just a coder

What Makes a Great LLD Course?

When choosing an online course for Low Level Design, look for the following:

Feature Why It Matters
Real-world case studies Prepares you for interview systems like Parking Lot, BookMyShow
Focus on OOP & SOLID Builds maintainable and scalable code
Design patterns in action Helps with reusability and flexibility
Code walkthroughs Strengthens implementation and debugging skills
Mock interview format Mimics real tech interview scenarios

Top Online Courses for Low Level Design in 2025

Here are the top courses, curated based on depth of content, instructor expertise, learner reviews, and relevance for interviews.

⭐ 1. Grokking the Low-Level Design Interview – DesignGuru.io

Best for: FAANG interview preparation

Why it's the best:
This course offers a step-by-step breakdown of interview-ready systems like Parking Lot, Splitwise, BookMyShow, and more. Each problem is modeled with UML diagrams, class design, and code in Java and Python.

Key Highlights:

  • Covers OOP, SOLID, and 10+ LLD problems

  • Uses real-world case studies

  • Strong community and doubt support

  • Trusted by thousands of SDE-2/SDE-3 aspirants

Rating: ★★★★★ (4.9/5)

???? 2. Scaler Academy – LLD Track

Best for: Full-time learners and career switchers

Scaler’s LLD module is part of its structured software engineering bootcamp. It includes mentorship, assignments, system walkthroughs, and mock interviews.

What makes it unique:

  • Weekly live classes and mentor sessions

  • Real-time code reviews

  • Advanced projects like Uber and Zomato

  • Peer group interaction and tech mockups

Rating: ★★★★☆ (4.8/5)

???? 3. Low Level System Design Course – Coding Minutes (via Udemy)

Best for: Budget learners looking for quality

This self-paced course offers great value for money. It explains LLD using OOP principles and popular design patterns.

Notable Features:

  • Over 25 hours of content

  • 10+ LLD system implementations

  • Covers Java and C++

  • Downloadable PDFs and class diagrams

Rating: ★★★★☆ (4.7/5)

???? 4. System Design Simplified (LLD + HLD) – ByteByteGo

Best for: Visual learners and mid-level engineers

Founded by ex-Facebook engineer Alex Xu, ByteByteGo's system design resources are visually rich and clear. The LLD modules pair beautifully with architecture overviews and include great design pattern usage.

Strengths:

  • Visual-first learning

  • Covers both LLD and HLD

  • Frequent updates and expert-led walkthroughs

Rating: ★★★★☆ (4.6/5)

???? 5. Object-Oriented Design & Patterns – Coursera (University of Alberta)

Best for: Developers with academic interest in design

This university-backed course is theory-heavy and focuses more on design principles than real-world systems. It's a great complement to more practical courses.

Includes:

  • Deep dives into OOP, inheritance, polymorphism

  • Abstract classes, interfaces, and clean coding practices

  • Assessments and certification

Rating: ★★★★☆ (4.5/5)

Course Comparison Table

Course Best For Key Features Language Practice Systems
Grokking LLD FAANG prep 10+ projects, UML, SOLID Java/Python Splitwise, BookMyShow
Scaler LLD Career switchers Mentorship, projects Java Uber, Zomato
Coding Minutes Budget learners 25+ hrs, code-heavy Java/C++ Vending Machine, LL Parking
ByteByteGo Visual learners Diagrams + deep dives Language-neutral Real apps
Coursera Theory learners Academic structure Java Conceptual focus

How to Choose the Right LLD Course for You

Ask yourself:

  • ????‍???? Are you preparing for product-based company interviews? → Go with Grokking LLD

  • ????‍???? Want a full learning program with mentorship? → Choose Scaler

  • ???? Looking for affordable options? → Start with Udemy/Coding Minutes

  • ???? Prefer visual over text-heavy content? → Pick ByteByteGo

  • ???? Interested in the academic foundations? → Explore Coursera

Tips to Get the Most Out of Your LLD Course

  1. Code along with the instructor – Don’t just watch.

  2. Draw class diagrams before implementing any system.

  3. Refactor your solutions to follow SOLID principles.

  4. Try alternate designs for the same problem.

  5. Practice verbalizing your designs like in interviews.

???? Pro Tip: Use platforms like Excalidraw or Lucidchart to create your own UML diagrams.

Final Thoughts

Choosing the best online course for Low Level Design in 2025 can give you a competitive edge in both interviews and professional development. Whether you're targeting FAANG roles or simply want to architect better code, these courses offer the structure, guidance, and practical skills you need to master LLD.

Investing in one of these courses could be the step that takes you from a good coder to a great software designer.

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