In today’s competitive tech landscape, staying relevant means constantly sharpening your skills. Whether you’re a seasoned software engineer or just getting started, regular problem-solving is essential. That’s where Coding Brushup steps in. Each week, developers from around the world visit the platform to tackle curated challenges designed to test and grow their coding capabilities.

In this blog, we’ll highlight the best weekly coding challenges on Coding Brushup tailored for Java developers, full stack professionals, and general programmers. Whether you’re looking for a coding challenge for Java, a language-agnostic coding challenge for programming, or a project-based coding challenge for full stack developer roles, this post has something for everyone.

Why Coding Challenges Matter

Coding challenges are more than just exercises. They are powerful learning tools that help you:

• Strengthen algorithmic thinking
  
• Prepare for technical interviews
  
• Learn real-world coding patterns
  
• Improve debugging and optimization skills
  

Regularly participating in a coding challenge for programming keeps your problem-solving instincts sharp, which is critical in fast-paced development environments.

Coding Challenge for Java: Reverse Level Order Traversal of a Binary Tree

Description:

This week’s featured coding challenge for Java focuses on tree traversal. Implement a function that performs reverse level order traversal of a binary tree.

Objective:

Instead of the usual top-down level order traversal, output the nodes from the bottom level up.

Why This Matters:

This Java-based problem helps reinforce understanding of binary trees, queues, and stacks. It also challenges your grasp of Java’s object-oriented principles.

Skills Tested:

• Java Collections (Queue, Stack)
  
• Tree data structure
  
• Recursion and iteration
  

By solving this coding challenge for Java, you’ll also become more comfortable with standard interview questions asked by top-tier companies.

Coding Challenge for Programming: Longest Common Substring Using Dynamic Programming

Description:

Given two strings, find the longest common substring using dynamic programming. This is a classic coding challenge for programming that tests understanding of memoization and optimal substructure.

Goal:

Return the length and content of the longest common substring between the two inputs.

Why It’s Important:

This problem helps solidify dynamic programming techniques. It’s not only a common interview question but also applicable in fields like text processing, bioinformatics, and diff-check algorithms.

Key Concepts:

• 2D dynamic programming arrays
  
• String manipulation
  
• Time complexity optimization
  

This coding challenge for programming is great for developers using Python, Java, C++, or any language of choice.

Coding Challenge for Full Stack Developer: Build a Simple Task Tracker App

Description:

Develop a task tracker that allows users to add, edit, complete, and delete tasks. This coding challenge for full stack developers involves both frontend and backend development.

Requirements:

• Frontend: Use React or Angular. Include forms and a responsive design.
  
• Backend: Use Node.js and Express. Implement RESTful routes and MongoDB for persistence.
  
• Authentication: Optional – JWT login to make it more realistic.
  

Why It Matters:

This challenge replicates a real-world use case and showcases your ability to build complete applications. It’s a solid project to include in your portfolio.

Skills Covered:

• API design
  
• Full stack architecture
  
• CRUD operations
  
• Database integration
  

A coding challenge for full stack developers like this helps you understand the entire flow of data from frontend to backend, a vital skill for modern web development.

Bonus Coding Challenge for Programming: Valid Parentheses Checker

Description:

Write a program to check whether a string containing only brackets is valid. For instance, ()[]{}() is valid, but ([)] is not.

Reason to Practice:

This problem teaches stack usage and how to manage real-time input processing. It’s a staple coding challenge for programming interviews.

Technologies:

• Implement it in any language: Java, Python, JavaScript
  
• Practice with input edge cases
  
• Add custom exception handling in Java for robustness
  

This coding challenge is simple but effective in sharpening your logic.

Additional Challenge for Java Developers: Implement a LRU Cache

Description:

Implement a Least Recently Used (LRU) cache using Java. Use LinkedHashMap or custom data structures.

Objective:

Build a cache that discards the least recently accessed item when full.

Why It’s a Key Coding Challenge for Java:

It demonstrates your understanding of object-oriented design, collections, and performance optimization. LRU caching is commonly used in operating systems, browsers, and mobile apps.

Advanced Concepts:

• Overriding removeEldestEntry() in LinkedHashMap
  
• Big O time for get() and put() operations
  

If you’re preparing for enterprise Java development roles, this coding challenge for Java is a must-solve.

Full Stack Developer Bonus: Integrate a Weather API

Description:

Use a public weather API to display weather data based on a city search.

Project Breakdown:

• Frontend: Build a form to search by city, display results dynamically.
  
• Backend: Optional – Create a proxy server for security.
  
• API: Use OpenWeatherMap or WeatherAPI.
  

Why Take This Coding Challenge for Full Stack Developer:

It mimics the way APIs are integrated in production apps. You’ll learn about asynchronous JavaScript, error handling, and responsive UI design.

Tips to Maximize Your Practice

1. Schedule Consistent Time – Tackle at least one challenge per day.
   
2. Join a Coding Community – Discuss strategies with others on forums.
   
3. Use Version Control – Push your work to GitHub and maintain a portfolio.
   
4. Review and Refactor – Revisit old challenges to improve efficiency.
   
5. Document Your Learning – Maintain notes or blog posts to reinforce understanding.
   

Final Thoughts

Each weekly coding challenge on Coding Brushup is more than a problem—it’s a step toward becoming a better developer. Whether you’re working through a coding challenge for Java, brushing up with a coding challenge for programming, or diving into real-world projects as a coding challenge for full stack developer, every task brings you closer to coding mastery.

Coding Brushup is designed to support your journey with relevant, industry-aligned challenges that test and improve your skills. No matter your level, there’s always something new to learn and build.

Start Your Challenge Today!

Visit Coding Brushup and pick your challenge of the week. Share your solutions, learn from others, and keep pushing forward. Consistent effort will lead to extraordinary results—one challenge at a time.