Production SaaS Platform

CloudMaster Pro

Multi-Tenant Production System Serving Real Business Operations

4 Weeks Development Time
22 APIs RESTful Endpoints
1000+ Concurrent Users
< 200ms API Response Time

Executive Summary

CloudMaster Pro is a production multi-tenant SaaS platform that real businesses depend on for their daily operations. I took end-to-end ownership of this system - from initial development to production stability - serving 1000+ concurrent users handling real customer data, billing, and VPS management operations. This case study demonstrates my ability to ship, stabilize, and maintain business-critical software under real-world pressure.

My Role

Full-Stack Product Engineer (End-to-End Ownership)

Duration

4 weeks to production + ongoing maintenance

Business Context

Production system for hosting company operations

Current Status

Live in production, serving real customers

The Business Problem

Why This System Exists

A hosting company was losing revenue and customers due to manual processes that couldn't scale. They needed a production-ready platform that could handle real business operations without human intervention:

My Ownership & Responsibilities

I was responsible for end-to-end development and ownership of the platform, including:

Real Problems I Solved

Production Issue Resolution

Problem: During the first week of production, users reported that VPS creation was failing intermittently, causing customer complaints and potential revenue loss.

My Solution: I diagnosed the issue as a race condition in the Proxmox API integration. Implemented proper error handling, retry logic, and transaction rollbacks. Fixed the issue without breaking existing VMs or causing downtime.

Performance Under Load

Problem: System performance degraded when concurrent users exceeded 500, causing slow response times and customer frustration.

My Solution: Identified database query bottlenecks and implemented connection pooling, query optimization, and Redis caching. Reduced API response times from 2+ seconds to under 200ms even with 1000+ concurrent users.

Business Logic Complexity

Problem: The multi-tenant permission system needed to handle complex scenarios where resellers could create users but not access admin functions, while maintaining data isolation.

My Solution: Designed and implemented a role-based access control system with hierarchical permissions. Each user type (Admin, Reseller, End User) sees only appropriate data and functions, ensuring business security and compliance.

Technology Stack

Backend

  • Java 17
  • Vert.x Framework
  • MySQL 8.0
  • JWT Authentication
  • BCrypt
  • Maven

Frontend

  • React 18
  • Tailwind CSS
  • Vite
  • Axios
  • React Router

Infrastructure

  • Ubuntu Server 22.04
  • Nginx
  • Proxmox VE
  • Cloudflare Pages
  • SSL/TLS

Tools

  • Git
  • Maven
  • npm
  • Postman
  • MySQL Workbench

Key Features Delivered

22 RESTful API Endpoints

Complete API coverage for all operations

Real-time VM Management

Create, Start, Stop, Delete VMs instantly

3-Tier User Hierarchy

Admin → Reseller → End User structure

IP Pool Management

Automated IP allocation and DNS integration

Storage Monitoring

Real-time storage tracking and backup system

Complete Audit Logging

Track all user actions and system events

Role-Based Access Control

Granular permissions for each user type

Responsive Dashboard

Mobile-friendly admin interface

Business Impact & Results

Immediate Business Results

Customer Onboarding

Reduced from 2+ hours manual work to 5 minutes automated

VPS Provisioning

Automated 100% of VPS creation and management tasks

Support Tickets

60% reduction in basic account and VPS management requests

Revenue Impact

Enabled scaling to 1000+ customers without additional staff

System Reliability

99.9% uptime maintained since production launch

Operational Efficiency

90% reduction in manual administrative tasks

Customer Satisfaction

Self-service portal improved customer experience significantly

Business Scalability

Platform ready for 10x growth without architectural changes

Technical Achievements

How I Work

This project demonstrates my approach to building production systems:

Need a Reliable Engineer for Your Production System?

I work best with founders who value ownership, clarity, and long-term collaboration. Let's discuss how I can build or stabilize your business-critical software.

Let's Talk Business View Source Code