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Senior Software Engineer (C#/.NET)

CoStar Group

$124,000 - $211,000
Sep 26, 2025
San Diego, CA, US
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CoStar Group is seeking Senior Software Engineers to build backend services powering their products, addressing problems of scale, consistency, and performance for tens of thousands of users on Amazon Web Services.

Requirements

  • 5+ years of deep .NET development (C-Sharp) development experience including cross-platform communication technologies such as Web API
  • 3+ years of database design, T-SQL programming, and performance tuning experience
  • Ability to design and develop using Object Oriented design principles and software design patterns to attain high reusability and maintainability
  • Deliver work products that meet specifications and are defect free and performant
  • Experienced in application performance testing and unit testing strategies and implementation
  • Excellent software development and engineering skills on large-scale, mission-critical infrastructure applications
  • Solid understanding of HTTP concepts (status codes, headers, etc.)

Responsibilities

  • Build big, distributed, API-driven systems for tens of thousands of users
  • Produce bullet-proof code that is robust, efficient, and maintainable; our primary tools are C-Sharp, .NET Framework, JSON, SQL Server, and AWS
  • Drive and lead software design, development standards, and code reviews
  • Continually evaluate emerging technologies to identify opportunities, trends, and best practices that can be leveraged to strengthen CoStar’s technology platform and develop practices

Other

  • Bachelor’s Degree required from an accredited, not-for-profit university or college.
  • A track record of commitment to prior employers.
  • A demonstrable track record of building and launching successful products and/or platforms that leverage terabytes of data and scale to meet the needs of millions of users
  • This position is located in San Diego, CA, and offers a work schedule of 4 days onsite, 1 day work from home
  • We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position.