We are building a modern web platform for aircraft maintenance programs that helps operators manage maintenance schedules, costs, and reliability across fleets of turbine-powered aircraft.
The goal is to modernize the backend architecture by migrating legacy PHP functionality to a scalable, production-ready .NET system while preserving all business rules and workflows. The project emphasizes clean architecture, safe migration strategies, and AI-assisted development practices.
Role Overview
We are looking for a Senior .NET Engineer with deep expertise in C# and ASP.NET Core, strong legacy migration experience, and practical daily use of AI coding tools.
This role involves leading backend modernization efforts, designing robust APIs, migrating data models, and ensuring functional parity between legacy and new systems.
Responsibilities
Backend Development & Migration * Build and maintain a modern .NET backend * Incrementally migrate legacy PHP functionality while preserving business rules and workflows * Apply clean architecture, CQRS, and sound domain modeling principles
AI-Assisted Development * Use AI tools (Copilot, Cursor, Claude Code, etc.) to accelerate coding, refactoring, and test scaffolding * Critically validate AI-generated output and catch inconsistencies * Structure tasks to maximize AI efficiency
API & Database Work * Design RESTful APIs for the new React frontend * Implement contract-first API design and versioning strategies * Migrate legacy data models into clean .NET domain models * Ensure data integrity during migration
Testing & Quality Assurance * Write unit and integration tests (xUnit/NUnit, Moq) * Ensure feature parity and regression safety during migration * Leverage AI tools to accelerate test coverage
Deployment & Knowledge Sharing * Support CI/CD pipelines and containerized deployments * Work with cloud infrastructure (Azure preferred) * Share AI-assisted development practices with the team
Requirements
Senior-Level .NET * Deep expertise in C#, ASP.NET Core, and Entity Framework Core * Strong understanding of dependency injection, middleware pipeline, and RESTful API design * Ability to design layered/clean architecture and apply CQRS patterns
Legacy Migration Experience * Experience decomposing and rewriting legacy systems * Understanding of the strangler fig pattern * Experience running legacy and new systems in parallel
AI Coding Tools Proficiency * Demonstrable daily use of AI-assisted development tools * Strong prompt engineering for complex code generation and refactoring * Ability to critically validate AI-generated output
Database & Data Migration * Strong experience with SQL Server, PostgreSQL, or MySQL * Schema design and migration scripting * Mapping legacy PHP/MySQL models to .NET domain models
Testing & Quality * Strong unit and integration testing practices * Understanding of migration-specific testing strategies
CI/CD & DevOps * Experience with GitHub Actions, Azure DevOps, or GitLab CI * Containerization with Docker * Cloud deployment experience (Azure preferred)
Nice to Have * Reading-level PHP knowledge (Laravel, Symfony, or vanilla) * Azure platform services (App Service, Azure SQL, Blob Storage, Application Insights) * OpenAPI/Swagger-first API design * Performance optimization (.NET profiling, caching strategies, async processing) * Documentation-driven development (ADRs, technical specs) * Mentoring and AI workflow enablement
