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Senior Software Engineer (C#/.NET)

CoStar Group

Salary not specified
Sep 11, 2025
Arlington, VA, US
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CoStar Group is looking to expand the data platform that supports its largest brands, including CoStar Suite, LoopNet, and Apartments.com, by hiring a Senior Software Engineer to build large, distributed, API-driven systems.

Requirements

  • 5+ years’ experience in C-Sharp, .NET Framework
  • Working knowledge and hands-on experience with cloud-based platforms (AWS or Azure)
  • Experience with RESTful web services and ASP.NET MVC/WebAPI
  • Experience in architecting, designing, and building large scale, distributed service-oriented systems and Web applications in an agile environment
  • Relational database schema design
  • SQL and database development knowledge
  • Familiarity with AWS PaaS services such as Lambda, DynamoDB, and SQS

Responsibilities

  • Build large, distributed, API-driven systems accessed by millions of users each month
  • Produce bullet-proof code that is robust, efficient and maintainable; our primary tools are C-Sharp, .NET Framework, SQL Server, AWS
  • Lead software design sessions, promote adoption of development patterns, perform code reviews
  • Continually evaluate emerging technologies to identify opportunities, trends, and best practices that can be leveraged to strengthen CoStar’s technology platform and development practices
  • Knowledge-sharing and mentoring of more junior-level team members

Other

  • Bachelor’s Degree required from an accredited, not for profit university or college.
  • A track record of delivering long-term impact to prior employers.
  • Strong communication skills; the ability to convey technical jargon to both business and technical partners
  • This position is located in Arlington, VA. and is in office Monday – Thursday with work from home on Friday.
  • CoStar Group is not able to provide visa sponsorship for this position.