Senior Software Engineer - Cloud & AI (C#/.NET, Claude)

CoStar; San Diego (CA); Hybrid; USD 124,000 - 187,000; Full time

Benefits offered by this job

Comprehensive healthcare coverage

401(K) retirement plan

Tuition reimbursement

On-site fitness center

Job summary

CoStar is seeking a Senior Software Engineer in San Diego, CA, to develop scalable cloud-native solutions with strong C#/.NET and AWS expertise. As part of a collaborative team, you will design production applications, mentor engineers, and leverage modern AI tools including Claude.

The position offers a competitive salary ranging from $124,000 to $187,000 and a comprehensive benefits package including healthcare and tuition reimbursement.

Qualifications

• Strong experience with C# and .NET / .NET Core.
• Hands-on AWS experience (EC2, ECS/EKS, Lambda, S3, RDS, DynamoDB, CloudWatch).
• Experience building APIs and backend services.

Responsibilities

• Design, build, and maintain production applications using C# and .NET.
• Build and operate cloud-based solutions on AWS.
• Mentor engineers and contribute to engineering best practices.

Skills

C#/.NET

AWS

API building

Git-based workflows

Education

Bachelor’s degree from an accredited college/university

Tools

Claude

Databricks

Terraform

CloudFormation

Job description

CoStar is seeking a Senior Software Engineer in San Diego, CA, to develop scalable cloud-native solutions with strong C#/.NET and AWS expertise. As part of a collaborative team, you will design production applications, mentor engineers, and leverage modern AI tools including Claude.

The position offers a competitive salary ranging from $124,000 to $187,000 and a comprehensive benefits package including healthcare and tuition reimbursement.