Quater - Water Quality Desktop App

Quater is an enterprise-grade desktop application for water quality analysis in industrial laboratories. Built with C#/.NET 10, Avalonia for cross-platform UI, and PostgreSQL with advanced authorization patterns.

Project Overview

This project demonstrates my ability to build complex, enterprise-grade systems with proper authorization, event-driven architecture, and maintainable code patterns.

Key Technologies

• Backend: C# /.NET 10, Entity Framework Core, MassTransit
• Desktop: Avalonia UI (cross-platform)
• Database: PostgreSQL with row-level security
• Architecture: Multi-tenant with claims-based authorization

Features

1. Multi-tenant Authorization

Implemented policies-based and claims-based authorization allowing laboratory managers to define granular access permissions per lab. Users can only see data they're authorized for.

2. Event-Driven Architecture

Using MassTransit for reliable message publishing and consumption between services. Enables real-time updates across the application.

3. Enterprise Patterns

• Repository pattern with specification pattern
• Unit of Work for transaction management
• Value Objects for type-safe domain modeling
• Integration tests for critical paths

Architecture Highlights

The project follows clean architecture principles with clear separation between:

• Core Domain: Business logic and entities
• Application: Use cases and orchestration
• Infrastructure: Database, messaging
• Presentation: Avalonia UI

AI Workflow

This project was built using my AI-assisted development workflow:

• Plannotator for planning and documenting architecture decisions
• OpenCode for code execution and review
• Every AI-generated plan is reviewed against engineering standards before execution

GitHub

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