Senior Software Engineer - C#/.NET, AWS, AI Tools, Hybrid

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

Benefits offered by this job

Healthcare coverage

401K with match

Tuition reimbursement

On-site fitness center

Job summary

CoStar Group, a leading real estate information provider, seeks a Senior Software Engineer in San Diego, CA. You will design, build, and maintain scalable cloud-based applications using C#/.NET, and leverage AWS and AI-assisted development to accelerate delivery.

You’ll work onsite four days a week with one remote day, collaborating with product, architecture, and engineering to improve performance and reliability while mentoring junior engineers and upholding engineering best practices.

Qualifications

• Bachelor's degree from an accredited college or university.
• Proven 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.
• Solid understanding of software design principles.
• Experience with Git-based workflows.

Responsibilities

• Design, build, and maintain production applications using C# and .NET
• Leverage Claude for code generation, refactoring, debugging, and analysis
• Build and operate cloud-based solutions on AWS
• Collaborate with product, architecture, and engineering teams
• Participate in system design, code reviews, and technical decision-making
• Improve application performance, scalability, and reliability
• Mentor engineers and contribute to engineering best practices

Skills

C#/.NET

AWS

APIs

Git workflows

CI/CD

Microservices

Education

Bachelor's degree

Tools

Databricks

Terraform

CloudFormation

CDK

Job description

CoStar Group, a leading real estate information provider, seeks a Senior Software Engineer in San Diego, CA. You will design, build, and maintain scalable cloud-based applications using C#/.NET, and leverage AWS and AI-assisted development to accelerate delivery.

You’ll work onsite four days a week with one remote day, collaborating with product, architecture, and engineering to improve performance and reliability while mentoring junior engineers and upholding engineering best practices.