5 GitHub Projects That Help Every Developer Build Stronger Coding Skills Fast in 2025

Whether you’re just starting out or leveling up, these hands-on projects sharpen your coding fundamentals and boost your confidence — fast.

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If you’re prepping for coding interviews, you probably know how overwhelming it can be.

LeetCode, system design, behavioral rounds there’s just so much to cover! But don’t worry, I’ve got your back.

I’ve handpicked five of the best GitHub repositories that will take your coding skills to the next level.

These aren’t just any repos; they are goldmines of knowledge that top candidates swear by.

Ready? Let’s dive in!

1. The Algorithms — Python (Best for DSA Practice)

🔗 GitHub Link: TheAlgorithms/Python

Why you should check it out:

• This repo has hundreds of algorithm implementations in Python.

• Covers sorting, searching, graphs, trees, DP, and more!

• You can contribute, learn, and even get some open source experience.

2. System Design Primer (For System Design Mastery)

🔗 GitHub Link: donnemartin/system-design-primer

📌 Why you should check it out:

• If you’re applying for Top level companies, system design rounds are a must.

• Covers scalability, load balancing, caching, databases, microservices, and more.

• Tons of real world case studies to help you think like a senior engineer.

Even if you’re not preparing for a system design interview, understanding how large scale apps work will make you a better developer!

3. Leetcode Patterns (Solve Problems Smarter, Not Harder)

🔗 GitHub Link: seanprashad/leetcode-patterns

📌 Why you should check it out:

• Instead of solving random LeetCode questions, this repo helps you recognize patterns in problems.

• Patterns like sliding window, backtracking, two pointers, DP, and more.

• Saves you hundreds of hours by showing efficient problem-solving approaches.

Many top candidates study patterns rather than individual problems because interviewers often repeat similar problem types!

4. JavaScript Algorithms & Data Structures (For JavaScript Lovers)

🔗 GitHub Link: trekhleb/javascript-algorithms

Why you should check it out:

• Covers DSA in JavaScript — perfect if you’re prepping for frontend or full-stack roles.

• Contains well documented explanations and interactive examples.

• If Python isn’t your thing, this repo has you covered!

If you’re applying for frontend roles, make sure you also brush up on DOM manipulation, event loops, closures, and async/await concepts.

5. Tech Interview Handbook (Your All in One Interview Guide)

🔗 GitHub Link: yangshun/tech-interview-handbook

Why you should check it out:

• Covers everything — coding, system design, behavioral interviews, and even resume tips.

• Includes hand picked LeetCode questions categorized by difficulty.

• A true interview playbook that walks you through every stage of the interview process.

Behavioral interviews matter just as much as coding! Learn how to answer questions like “Tell me about a time when you solved a conflict on your team” the right way.

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