Sun Tan City: Scalable Legacy System Modernization

Project information

Tanning salon chain with 300+ locations across the US

Sun Tan City  operates a complex ecosystem consisting of several digital products: a public website and web application for customer accounts, native iOS and Android apps, and multiple internal systems used for accounting, HR, receptionist desktops, and email communication.

Over the past decade, the software infrastructure has grown organically through independently developed modules—each created in isolation to solve specific operational needs.

As a result, the current system is fragmented, outdated, and difficult to maintain.

Stabilization & Support

We ensured platform reliability and eliminated performance bottlenecks through a series of stabilization measures.

• Delivered critical fixes for legacy mobile and desktop applications
• Resolved Azure performance issues and optimized infrastructure costs

Product Modernization

To accelerate product growth, CodeIT re-engineered the client ecosystem for consistency, speed, and user experience.

• Consolidated iOS and Android into a single Flutter app
• Migrated key customer flows (such as check-in) into mobile apps to reduce front-desk load
• Rebuilt the customer web portal as a modern React SPA
• Relaunched the marketing website on Next.js + Kentico Xperience CMS

Refactoring & Integration

We modernized legacy applications and improved system efficiency.

• Migrated PHP/.NET apps into cross-platform solutions
• Optimized algorithms — processes that took hours now run in minutes

Engineering & DevOps Transformation

Our team transformed the development lifecycle to achieve consistent, high-quality releases.

• Migrated from SVN to Git
• Introduced CI/CD pipelines for predictable deployments
• Modularized monolithic codebases
• Implemented automated testing

Process Improvements

To sustain scalability, we refined delivery and collaboration frameworks.

• Introduced Jira for structured backlog management and transparent tracking
• Established clear BA, QA, DevOps, frontend, and backend workflows
• Improved delivery predictability and cross-team collaboration
• Designed a phased modernization roadmap enabling transformation without downtime

Result

Transforming technology into measurable business growth

Modernizing the client’s architecture and processes unlocked scalability, accelerated delivery, and delivered tangible ROI across operations, customer experience, and financial performance.

• Removed growth barriers: modernized architecture unlocked scalability and enabled faster innovation.
• Mobile app success: ratings improved from 1.4 to 4.4 stars in App Store and Google Play, boosting brand perception and customer loyalty.
• Technical maturity: predictable development cycles with documented workflows, CI/CD, and testing culture.
• Faster business processes: redesigned business processes significantly reduced wait times and improved staff productivity.
• Financial impact: Azure optimization cut infrastructure costs; automation reduced manual workload.
• Faster time-to-market: release cycles shortened from months to weeks, enabling quicker innovation.

Achievements

Through this engagement, CodeIT strengthened its expertise as a trusted digital transformation partner:

• Pioneering Sitefinity + Next.js Integration. Acted as early beta adopters, helping shape the platform’s modernization path.
• Legacy Takeover Expertise. Stabilized and modernized a large, undocumented system while ensuring zero disruption to daily business — true “open-heart surgery.”
• Cloud Recovery at Scale. Restored performance and cost efficiency after a failed Azure migration.
• End-to-End Engineering Practices. Built a modern DevOps culture from scratch, introducing Git, CI/CD, modular architecture, and automated testing aligned with real business needs.

Techstack

Team