Software Engineer (C#/.NET)
Core
Build big, distributed, API-driven systems and AI-powered software solutions for CoStar's commercial and residential real estate platforms.
Role type
Senior IC Software Engineer (.NET/C#)
Builds
Data platform supporting CoStar Suite, LoopNet, Homes.com, and Apartments.com
Domain
Real Estate Technology / Cloud Infrastructure
Deliverable
production ML models | product features | infrastructure
Required skills
C#, .NET Framework, Web API, RESTful services, ASP.NET MVC, SQL Server, AWS, distributed system architecture, data modeling, observability, LLMs/prompt engineering
Preferred skills
AWS PaaS (Lambda, DynamoDB, SQS), AI agent implementation, AI-assisted development practices
Technologies
C#, .NET, SQL Server, AWS, REST, ASP.NET MVC
Responsibilities
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; Drive software design standards and code reviews; Build intelligent automation solutions; Collaborate with Product, Research, and Data teams.
Seniority
Senior, hands-on IC