Sr/Principal Engineer - Full-Stack .NET Developer-AI-Forward

TELESOFT LLC DBA CALERO • Phoenix, AZ

9h • $120,000

About The Position

We’re looking for a senior full-stack .NET developer who treats AI tooling as a core part of their engineering practice. You’ll build and maintain a multi-service technology expense management platform built on .NET 8, working across both backend microservices and modern frontend applications. You should use AI coding assistants (Cursor, GitHub Copilot, Claude, ChatGPT, or similar) fluently, critically, and responsibly, reviewing generated code with the same rigor you’d apply to a junior developer’s PR.

Requirements

• 5+ years of professional C# / .NET development (.NET 6+ preferred)
• Strong understanding of dependency injection, async/await patterns, and service lifetime management
• Experience with front-end frameworks (React)
• Experience with message-driven architecture (Rebus, MassTransit, NServiceBus, or similar)
• Comfort working in multi-tenant SaaS environments
• Solid SQL / EF Core skills and experience with schema migrations in production systems
• Demonstrable experience using AI coding tools as a genuine productivity multiplier, with judgment to catch what they get wrong

Nice To Haves

• Experience with technology expense management, FinOps tooling, or cloud billing APIs (Azure/AWS/GCP)
• Background in Clean Architecture / Domain-Driven Design
• Experience with spec-driven development and code generation
• Experience writing AI-assisted code at scale and helping establish team norms around it

Responsibilities

• Design and implement features across a distributed .NET 8 microservice platform (REST APIs, background workers, message bus handlers)
• Build and maintain modern front-end applications using React and TypeScript
• Apply Clean Architecture and CQRS patterns to backend services
• Author and evolve EF Core database migrations in a shared schema model
• Write unit, integration, and end-to-end tests
• Use AI coding tools actively for scaffolding, refactoring, code review, and exploration while maintaining quality ownership
• Participate in code review with a focus on patterns, correctness, and maintainability
• Contribute to and uphold architectural standards and shared patterns across teams

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed
• Number of Employees: 101-250 employees