D-TECT V2 — Legacy Backend Modernization

Problem Statement

The SGS D-TECT inspection platform ran on a .NET Framework 4.8 monolith that was increasingly hard to maintain, extend, and deploy. The client needed a migration path to modern tooling without disrupting ongoing operations.

My Role

Tech Lead — architecture decisions, technical coaching, client consulting, and hands-on delivery.

Architecture

• Clean Architecture with strict layer boundaries (Domain → Application → Infrastructure → API)
• CQRS via Wolverine — commands and queries separated, async messaging built in
• EF Core replacing legacy data-access layer with code-first migrations
• SQL Server (unchanged schema, migrated incrementally)

Key Decisions

• Chose Wolverine over MediatR for its built-in transport and saga support, reducing boilerplate
• Kept the database schema stable during migration to allow parallel operation of old and new backend
• Introduced architectural fitness functions in CI to enforce layer boundaries

Tech Stack

.NET 10 · Wolverine · CQRS · EF Core · Clean Architecture · SQL Server