Senior Backend Engineer - C#/.NET, AWS, AI (Hybrid)

CoStar Group, Inc.; Irvine (CA); Hybrid; USD 150,000 - 190,000; Full time

Job summary

CoStar Group's LoopNet brand in Irvine, CA is seeking a Senior Software Engineer with deep expertise in C#/.NET, AWS, and AI coding tools to build scalable backend systems across LoopNet.com and other brands. You will contribute to architecture decisions, mentor engineers, and deliver high-quality software in a hybrid role with four days onsite and one day remote.

A Bachelor’s degree and 6+ years of experience are required.

Qualifications

• Bachelor's degree required.
• 6+ years of backend software experience.
• Strong API design and testing skills.
• Experience with C#/.NET preferred.

Responsibilities

• Build scalable backend systems for LoopNet.com and other brands.
• Contribute to architecture decisions and technical direction.
• Mentor engineers and promote best practices in code quality.
• Deliver high-quality software with robust testing.

Skills

API design

Testing

Backend development

Education

Bachelor's degree

Tools

C#/.NET

AWS

AI coding tools

Job description

CoStar Group's LoopNet brand in Irvine, CA is seeking a Senior Software Engineer with deep expertise in C#/.NET, AWS, and AI coding tools to build scalable backend systems across LoopNet.com and other brands. You will contribute to architecture decisions, mentor engineers, and deliver high-quality software in a hybrid role with four days onsite and one day remote.

A Bachelor’s degree and 6+ years of experience are required.