A software platform that helps engineers sharpen their coding skills via live competitions on algorithms

• Technologies
• Structure
• Database design
• Features
• Socket flowchart
• Inspiration
• Author

• Node.js
• Express.js
• AWS EC2

• HTML
• CSS
• JavaScript
• Pug
• Axios

• Socket io

• MySQL
• AWS RDS

• HTTP & HTTPS
• Domain Name System (DNS)
• Nginx
• SSL Certificate (Let's Encrypt)

• Jest
• Supertest
• Artillery

• AWS S3
• Google login API
• GitHub login API
• Docker

• Live competition:
  • Match pages show instant mock terminal results of you and your opponent
• Match modes choices:
  • Users can choose between the random stranger mode (with other available users online) and the invitation mode
  • Users can choose their preferred difficulty and the category of an upcoming match
• Code rating:
  • The server rates your code based on correctness (percentage of test cases passed) and performance (if the execution time of large test cases passes their according thresholds)
• User-related features:
  • Leaderboard ranks the top users
  • Homepage shows real-time number of online users

• Single mode for code practices
• Increase questions of the library
• Chat rooms for messaging among users
• Community among users

Senario: every user connected pings every five seconds

Senario: user A (on client A) starts a match with stranger mode and user B (on client B) is invited

Senario: user A (on client A) is in a match with user B (on client B) when nobody exits the match

Senario: user A (on client A) is in a match with user B (on client B) when A exits the match in the middle of the match

Senario: user A (on client A) attemps to join a match that has ended

Project inspired by Codewars and Codility, questions based on LeetCode

Wenchin Chuang @wenchin77