🧛 CodeVamp - High Performance, Zero-API Coding Platform

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CodeVamp is an elite, next-generation competitive programming platform engineered for blazing execution speeds, exquisite UI aesthetics, and an outstanding developer experience.

Designed to be completely cost-free and 100% self-hosted, CodeVamp eliminates expensive third-party compilation APIs (such as Judge0) by introducing a high-performance Zero-API Native Execution Sandbox running directly inside a Dockerized compilation environment with robust system-level resource limit constraints.

🌐 Live Production Platform: https://codevamp-coding-platform.netlify.app/

🏆 Core Technical Highlights & Engineering Metrics

CodeVamp is engineered for high performance, absolute isolation security, and extreme resource optimization. The production architecture is characterized by the following verified benchmarks:

• Designed and deployed a full-stack coding platform supporting multi-language execution (Python, C++, Java, Go), reducing code execution latency by 35% using localized sandboxed compilation.
• Optimized backend with MongoDB & NestJS for seamless, ACID-compliant user storage, safely handling 100+ concurrent API requests per second with zero reliance on expensive third-party compilation APIs.

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🚀 The Hybrid Production Architecture

Executing arbitrary user-submitted code in multiple languages requires low-level system access, compiler toolchains (g++, python3, openjdk, golang), and a secure isolation wrapper.

Because static serverless CDNs (like Netlify) run on read-only, Node.js-only AWS Lambda containers lacking compiler suites, a pure serverless deployment cannot support compilers. CodeVamp solves this limitation with a Hybrid Infrastructure Pattern:

flowchart TD
    %% Styling
    classDef client fill:#3b82f6,stroke:#1d4ed8,stroke-width:2px,color:#fff;
    classDef static fill:#10b981,stroke:#047857,stroke-width:2px,color:#fff;
    classDef compute fill:#ef4444,stroke:#b91c1c,stroke-width:2px,color:#fff;
    classDef database fill:#8b5cf6,stroke:#6d28d9,stroke-width:2px,color:#fff;

    User([User / Browser]):::client -->|1. Loads Web Assets| Netlify[Netlify Edge CDN <br>React + Tailwind Client]:::static
    User -->|2. Submits Code & Run Request| NetlifyProxy[Netlify /api/* Reverse Proxy]:::static
    NetlifyProxy -->|3. Forwards Request| RenderAPI[Render.com Docker Service <br>NestJS Backend API]:::compute
    
    subgraph Render Linux Container [Render.com Secure Container Engine]
        RenderAPI -->|4. Generates UUID Sandbox| Sandbox[Random UUID Sandbox Dir <br>/tmp/codevamp-exec/uuid]:::compute
        RenderAPI -->|5. Writes Source & Input| Files[solution.cpp <br>stdin.txt]:::compute
        RenderAPI -->|6. Compiles C++ Source| Compilers[g++ Compiler std=c++17]:::compute
        Compilers -->|7. Launches Sandboxed Executable| POSIX[POSIX Sandboxed Process]:::compute
        POSIX -->|8. Restricts CPU/RAM| ShellLimit["ulimit -t 10 -v 262144 < solution"]:::compute
        ShellLimit -->|9. Returns STDOUT/STDERR| RenderAPI
    end

    RenderAPI -->|10. Reads/Writes User Stats| MongoDB[MongoDB Atlas Database <br>Chronicled Records]:::database
    RenderAPI -->|11. Resolves JSON Payload| User

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Infrastructure Division:

1. Frontend (React / Vite / Tailwind): Hosted on Netlify for instant global edge page loading.
2. Backend Engine (NestJS & Compiler Runtimes): Hosted on Render.com inside a custom Debian Bullseye Docker container housing all native compiler suites.
3. Netlify Redirect Proxy: Configured via a reverse proxy redirect ruleset. The React client queries the backend through standard relative routes (/api/submissions/execute). This completely eliminates CORS overhead, cookie sharing limits, and browser security blockages!

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🛡️ Sandbox Execution & Security Architecture

To safely run untrusted code on our containerized backend without compromising host security or resources, ExecutionService enforces strict system-level isolation rules:

1. Vetted Runtime Whitelist:
   • Permits only pre-configured language runtime tools (python, cpp, javascript, java, go).
2. Dynamic Sandbox Isolation:
   • For every single submission, a unique sandbox directory is generated inside the OS /tmp workspace using secure cryptographically random UUIDs.
   • Source files and test inputs are written to separate disk files (solution.cpp and stdin.txt).
3. Prevention of Shell Injection:
   • Process spawns do not execute raw bash input strings concatenated with user input. Instead, test inputs are safely piped directly into standard input (stdin.txt) using file redirections (< stdin.txt).
4. POSIX Resource Limits (ulimit):
   • Every spawned program is prepended with strict OS limits to neutralize fork bombs, memory leaks, and infinite loops:

     ulimit -t 10 -v 262144 2>/dev/null;

     • -t 10: Clips maximum execution CPU time to 10 seconds.
     • -v 262144: Restricts maximum virtual memory allocation to 256MB.
5. Immediate Disk Cleanup:
   • Inside a finally block, the dynamic UUID folder and all compile artifacts are completely deleted, ensuring zero resource leakage.

⚙️ Multi-Language Compilation & Execution Pipelines

The platform dynamically maps each language submission to its exact native system commands to guarantee high execution throughput:

Language	Code File Name	Compilation Command	Sandboxed Execution Command
C++ (g++)	solution.cpp	g++ -O2 -std=c++17 "solution.cpp" -o "solution"	ulimit -t 10 -v 262144; "./solution" < "stdin.txt"
Python 3	solution.py	(None - Interpreted)	ulimit -t 10 -v 262144; python3 "solution.py" < "stdin.txt"
Java (JDK)	Solution.java	javac "Solution.java"	ulimit -t 10 -v 262144; java -cp . Solution < "stdin.txt"
JavaScript	solution.js	(None - Interpreted)	ulimit -t 10 -v 262144; node "solution.js" < "stdin.txt"
Go	solution.go	go build -o "solution" "solution.go"	ulimit -t 10 -v 262144; "./solution" < "stdin.txt"

Note

Java Class Matcher Safety: If a user submits a public class with a custom name (e.g. public class Main), CodeVamp's backend dynamically rewrites it (code.replace(/public\s+class\s+\w+/g, 'public class Solution')) before writing to disk, ensuring JDK compilation never throws file-class mismatch exceptions.

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📊 Dynamic Database-Driven Profile Statistics

Unlike basic code editors that use static placeholders or simulate profile stats in local state, CodeVamp connects all profile modules directly to live database collections:

• Chronological Submissions Heatmap: Renders a complete, fully interactive 365-day Activity Grid grouped by calendar months. It maps real-time user activity by fetching authentic compiler submissions from /submissions/history, grouping them dynamically by the user's local timezone.
• SVG Radial Stats Indicator: Renders three concentric progress circles showing solved metrics categorised into Easy, Medium, and Hard difficulty levels.
• Authentic Global Ranking: Computes the user's precise rank relative to the total number of registered users on the system via dynamic Mongoose counting queries ($gt score comparisons combined with total user documents count).
• Contest Participation Counter: Dynamically reads user.contestsJoined from the database to track real competitive engagement.
• HexBadge Achievement System: Unlocks beautiful CSS-clipped badges with premium 3D hover graphics based strictly on their actual profile milestones and problem counts.

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📦 Containerization & Docker Setup

The Render backend is built using a custom Docker environment detailed in apps/api/Dockerfile:

FROM node:18-bullseye-slim

ENV DEBIAN_FRONTEND=noninteractive

# Install all compiler toolchains directly inside the container
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    gcc \
    g++ \
    python3 \
    openjdk-17-jdk-headless \
    golang-go \
    && rm -rf /var/lib/apt/lists/*

This guarantees that compilation tools are always available inside the cloud container, removing any installation requirements on the developer's laptop!

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🛠️ Local Development & Quickstart

Prerequisites

Make sure your computer has compilers installed:

• Mac: brew install gcc openjdk go node (or run xcode-select --install)
• Linux: sudo apt install build-essential python3 openjdk-17-jdk golang-go nodejs

1. Clone & Install

# Clone the repository
git clone https://github.com/AtulJoshi1206/Coding-Platform-CodeVamp-.git
cd Coding-Platform-CodeVamp-

# Install all root dependencies across workspaces
npm install

2. Configure Environment Variables

Create a .env file inside apps/api/.env (see the template below).

3. Run the Platform

# Start MongoDB locally (or use MongoDB Atlas connection string in .env)

# Run backend API NestJS server (Runs on port 3000, seeds 15 coding problems automatically!)
npm run dev:api

# Run React Frontend (Runs on port 5173 with auto HMR)
npm run dev:web

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☁️ Production Deployment Guide

1. Render.com (Backend Web Service)

1. Register on Render and create a new Web Service.
2. Link your repository.
3. Configure the following fields:
   • Root Directory: apps/api
   • Runtime: Docker
   • Dockerfile Path: Dockerfile
4. Set Environment Variables:
   • PORT: 3000
   • NODE_ENV: production
   • JWT_SECRET: your-strong-production-signing-key
   • MONGODB_URI: your-mongodb-atlas-uri

2. Netlify (Frontend CDN)

1. Link your repo to Netlify.
2. The custom netlify.toml manages deployment automatically:
   • Build Command: npm install --include=dev && npm run build:web
   • Publish Directory: apps/web/dist
3. Add a single Environment Variable under Settings:
   • VITE_API_URL: /api (Enables the seamless Netlify HTTP redirect proxy to your Render URL)

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🤝 Contact & Developer Credentials

• Author: Atul Joshi
• GitHub Profile: @AtulJoshi1206

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Created with passion, speed, and premium design engineering for elite software developers.