Multi-Tenant Production System Serving Real Business Operations
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.
Full-Stack Product Engineer (End-to-End Ownership)
4 weeks to production + ongoing maintenance
Production system for hosting company operations
Live in production, serving real customers
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:
I was responsible for end-to-end development and ownership of the platform, including:
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.
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.
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.
Complete API coverage for all operations
Create, Start, Stop, Delete VMs instantly
Admin → Reseller → End User structure
Automated IP allocation and DNS integration
Real-time storage tracking and backup system
Track all user actions and system events
Granular permissions for each user type
Mobile-friendly admin interface
Reduced from 2+ hours manual work to 5 minutes automated
Automated 100% of VPS creation and management tasks
60% reduction in basic account and VPS management requests
Enabled scaling to 1000+ customers without additional staff
99.9% uptime maintained since production launch
90% reduction in manual administrative tasks
Self-service portal improved customer experience significantly
Platform ready for 10x growth without architectural changes
This project demonstrates my approach to building production systems:
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.