CodeX

A full stack competitive programming platform built to push developers beyond their limits.

Features

Code Editor & Execution Engine

The core of CodeX. A fully integrated coding environment that feels like a real IDE, not a glorified text box.

Capability	Description
Monaco Editor	VS Code-grade editor with syntax highlighting, autocomplete, and theming
Multi-Language Support	Write and submit in JavaScript, C++, or Java
Judge0 Integration	Remote code execution with batch test case evaluation against hidden + visible test cases
Real-time Feedback	Instant runtime, memory usage, and per-test-case pass/fail results
Complexity Analyzer	AI-powered Big-O time & space complexity analysis of your submitted code

AI-Powered DSA Tutor

Not a chatbot. A context-aware tutor that understands the exact problem you're solving.

• Gives hints without spoiling the solution — guides you to think, not copy
• Reviews your code with line-by-line explanations of bugs and inefficiencies
• Suggests multiple algorithmic approaches with complexity trade-offs
• Acts as a test case helper for edge case validation
• Strictly scoped to the current problem — no distractions, no off-topic wandering

Virtual Mock Interviews

Simulates the pressure and pace of a real technical interview.

• Choose interview type (DSA, System Design, Behavioral) and difficulty level
• Progressive questioning that adapts based on your answers
• Evaluates correctness with 1-sentence explanations — no fluff
• End-of-session performance summary with actionable improvement tips
• Feels human, responds fast, and never goes easy on you

AI Resume Builder & Analyzer

An entire career toolkit, not just a form.

• Build a professional resume from scratch with guided sections
• AI Analysis — get strengths, weaknesses, and specific recommendations
• Content Improver — paste a bullet point, get back an ATS-optimized, impact-driven version
• Improvement Suggestions — 3 targeted suggestions per field, tuned to your section context
• PDF Export — generates a polished, print-ready HTML resume with professional styling

Live Contests with Leaderboards

Compete globally. Track everything.

• Timed contests with start/end windows and real-time participation tracking
• Multi-problem contest sets — each contest bundles curated problems
• Per-user metrics — time taken, problems attempted, submissions per problem
• Contest results page with full leaderboard and performance breakdown
• Admin tools for creating, managing, and deleting contests

Personal Dashboard & Analytics

Your entire coding journey, visualized.

• Problems solved breakdown by difficulty (Easy / Medium / Hard)
• Streak tracking — current streak, longest streak, last active date
• Activity heatmap based on submission history
• Recent submissions with status, runtime, and linked problem details
• Contest participation count and history

Community Blog

A space for developers to share knowledge, stories, and raw experiences.

• Write with a rich text editor on topics like interviews, contests, careers, and more
• Category filtering — find posts relevant to your interests
• Anonymous posting — share without attaching your name
• Likes & comments — engage with the community
• Full CRUD — create, edit, and manage your own posts

Course Promotions & Marketplace

A built-in promotion system for courses and resources.

• Self-serve ad platform — users can promote their courses with images and descriptions
• Google Vision SafeSearch integration for automated content moderation
• Razorpay payment integration for promo slot purchases
• Slot-based system with configurable duration (1 day, 1 week, 1 month)
• Click tracking and admin approval workflow

Auth & Security

Production-grade authentication, not an afterthought.

• JWT-based session management with HTTP-only cookies
• Bcrypt password hashing
• OTP verification via email (Nodemailer)
• Forgot password flow with secure reset tokens
• Role-based access control — Admin vs User with protected routes on both frontend and backend
• Profile pictures via Cloudinary upload

Admin Panel

Full control over the platform's content and operations.

• Problem Management — create problems with visible/hidden test cases, starter code in multiple languages, and reference solutions
• Contest Management — create and delete contests, assign problem sets
• Video Management — upload and manage solution videos per problem
• Promo Moderation — approve, reject, or remove course promotions
• Blog Moderation — manage community content

Architecture

codex/
├── frontend/                    # React 19 + Vite 7
│   ├── src/
│   │   ├── pages/               # 16 page components
│   │   │   ├── Homepage          # Problem listing, search, filtering
│   │   │   ├── ProblemPage       # Code editor + test runner
│   │   │   ├── ContestEditorPage # Contest-mode problem solving
│   │   │   ├── DashboardPage     # Personal analytics & stats
│   │   │   ├── Interview         # Virtual mock interview interface
│   │   │   ├── Resume            # AI resume builder & analyzer
│   │   │   ├── PromotePage       # Course promotion marketplace
│   │   │   └── ...
│   │   ├── components/           # Reusable UI components
│   │   │   ├── problem/          # Editor panels, sidebar, results
│   │   │   ├── main/             # Blog cards, feed, promo sidebar
│   │   │   └── shared/           # Common components
│   │   ├── store/                # Redux Toolkit state management
│   │   ├── services/             # API service layer
│   │   ├── hooks/                # Custom React hooks
│   │   └── utils/                # Utility functions
│   └── ...
│
├── backend/                     # Express 5 + Node.js
│   ├── src/
│   │   ├── controllers/         # 13 controller modules
│   │   │   ├── userSubmission    # Code run & submit via Judge0
│   │   │   ├── solveDoubt        # AI DSA tutor (Gemini)
│   │   │   ├── interview         # Virtual interview bot (Gemini)
│   │   │   ├── resumeAnalysis    # Resume AI analysis & PDF gen
│   │   │   ├── problemAnalyzer   # Big-O complexity analyzer
│   │   │   ├── userDashboard     # Aggregated analytics pipeline
│   │   │   └── ...
│   │   ├── models/              # 7 Mongoose schemas
│   │   │   ├── user             # Users with roles & solved tracking
│   │   │   ├── problem          # Problems with test cases & solutions
│   │   │   ├── submission       # Code submissions with metrics
│   │   │   ├── contestModule    # Contests with participants & timing
│   │   │   ├── blog             # Community posts with engagement
│   │   │   └── ...
│   │   ├── routes/              # 12 route modules
│   │   ├── middleware/          # Auth, validation, file upload
│   │   └── config/              # DB, Cloudinary, environment
│   └── ...

Tech Stack

Layer	Technologies
Frontend	React 19, Vite 7, Redux Toolkit, TailwindCSS 4, DaisyUI 5, Monaco Editor, Recharts, Framer Motion
Backend	Node.js, Express 5, Mongoose, JWT, Bcrypt, Nodemailer
Database	MongoDB (primary), Redis (caching)
AI	Google Gemini 1.5 Flash — tutor, interviews, resume analysis, complexity analysis
Code Execution	Judge0 API — sandboxed multi-language code execution
Payments	Razorpay — course promo purchases
Media	Cloudinary — image/video upload & CDN
Content Safety	Google Cloud Vision — SafeSearch moderation for user-uploaded promo images
Form Validation	React Hook Form + Zod schema validation

What's Next

CodeX is actively evolving. Here's what's on the horizon:

• Collaborative coding rooms — solve problems together in real-time
• Discussion forums per problem — community solutions and debates
• Skill-based matchmaking for contests
• Weekly challenges with curated problem sets
• Dark/Light theme toggle with system preference detection
• Mobile-responsive code editor experience
• Webhooks & notifications for contest reminders and streak alerts

Built with obsession by Amey
_{If it helped you, drop a ⭐ it fuels the grind.}