Re-engineering a legacy mobile application into a modern .NET MAUI solution
A legacy Xamarin.Forms mobile application for PDR technicians, stalled mid-migration, re-engineered to .NET MAUI in three months under a hard app store deadline. Through reverse engineering and iterative requirement discovery, we rebuilt the full field workflow — damage documentation, invoicing, job tracking, and commission management — on a clean, maintainable architecture that reduced crashes by 30% and cut maintenance effort by 40%.
Industry:
Automotive
Region:
USA
Client since:
2025
PDR Mobile Solutions is a mid-sized service provider in the automotive aftermarket industry, specializing in paintless dent repair (PDR). Their mobile application is used by technicians and repair shops in the field to estimate repairs, document vehicle damage through photos and panel selection, manage invoicing, rates, and insurance matrices, track jobs, technicians, and commissions, and generate quotes and invoices on-site.
MODERNIZATION
Build a future-proof mobile platform
EFFICIENCY
Reduce long-term maintenance effort
ARCHITECTURE
Establish a clean, modular .NET MAUI foundation
Services and expertise
Challenge
Three months before app stores disabled the client's application, an incomplete Xamarin-to-MAUI migration had stalled — their team lacked the MAUI expertise to finish it in time.
The client's mobile application supported the full field workflow for PDR technicians: damage documentation, invoicing, insurance matrices, job and commission tracking. The app had accumulated significant complexity over the years, and the legacy Xamarin.Forms codebase had no formal documentation.
When Microsoft announced end-of-support for Xamarin.Forms, the client's team began the migration to .NET MAUI but couldn't complete it.
With three months to the deadline, they came to us with three simultaneous constraints:
- No runway: the existing migration attempt was incomplete and the deadline was fixed
- No formal requirements: business rules were embedded in undocumented legacy code
- A deliberate scope decision: stakeholders wanted to simplify the product, not replicate years of accumulated complexity — which meant making product decisions under time pressure
Solution
The team adopted a re-engineering approach based on .NET MAUI, prioritizing modernization, architectural clarity, and requirement discovery over recreating legacy complexity.
.NET MAUI gave us a single cross-platform codebase with better performance than Xamarin.Forms and access to mature ecosystem tooling — MVVM support, dependency injection, and Hot Reload.
The approach:
- Reverse engineering: legacy codebase analysis combined with field observation to capture actual system behavior.
- Iterative requirement discovery: observed behaviors transformed into user stories and validated with business stakeholders.
- Modern MAUI architecture: clean MVVM-based architecture with modular layers and MAUI Shell navigation.
- Parallel migration: functionality rebuilt module by module, with feature toggles and side-by-side testing.
Implementation highlights:
- Unified cross-platform UI with consistent navigation and improved accessibility
- Offline-first architecture using SQLite with background synchronization
- Performance improvements enabled by the .NET 8 runtime and MAUI handlers
- Rebuilt core functionality, including delivery tracking, route assignments, photo and signature capture, messaging, and notifications
The tools and technologies we used were:
Results
Re-engineering the application using .NET MAUI proved effective despite the lack of predefined requirements. Through reverse engineering, iterative collaboration, and a clean, modular architecture, the team delivered a maintainable, future-ready mobile solution that reduced operational risk and improved scalability.
- 30% reduction in reported application crashes compared to the legacy version, supported by a unified codebase and a clean separation between business logic and UI.
- 25% faster average application load time achieved through the .NET 8 runtime and optimized MAUI handlers.
- 40% decrease in maintenance effort as a result of the modular architecture, significantly reducing rework and simplifying future extension.
- Improved user satisfaction following UX enhancements and more consistent cross-platform navigation.
- Increased organizational clarity around actual business workflows, ensuring operational continuity despite the absence of formal requirements.
These results were driven by aligning the rebuilt architecture with real-world usage rather than undocumented assumptions — a clean foundation that reduced operational risk and left the client with a codebase they can actually maintain and extend.
Confidential name
Director & VP of Engineering
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