Software Engineer I (C#/.NET)
Core
Build distributed, API-driven systems and AI-powered software solutions for CoStar's real estate data platform and customer-facing brands.
Role type
Software Engineer I (C#/.NET)
Builds
Data platform supporting CoStar Suite, LoopNet, Homes.com, and Apartments.com
Domain
Real Estate Information / Cloud / AI
Deliverable
production ML models
Required skills
C#, .NET Framework, Web API, RESTful services, SQL Server, AWS, LLMs, prompt engineering, agent-based architectures, telemetry, observability
Preferred skills
AWS PaaS (Lambda, DynamoDB, SQS), data modeling, AI agents, workflow automation, AI-assisted development
Technologies
C#, .NET, SQL Server, AWS, Claude Code
Responsibilities
Build big, distributed, API-driven systems; Design and implement AI-powered software solutions; Build and integrate AI skills, agents, and intelligent workflows; Produce robust, efficient, and maintainable code; Utilize AI models to enhance monitoring and observability; Implement telemetry-driven solutions; Learn software design standards and participate in code reviews; Build intelligent automation solutions; Evaluate emerging technologies
Seniority
Junior, hands-on IC
