Job Description

Role Description:

We’re seeking a Senior Software Engineer with strong C#/.NET experience, hands-on use of Claude for AI-assisted development, and proven experience building and operating systems on AWS. This role focuses on developing scalable, cloud-native solutions while leveraging modern AI tools to accelerate development and improve code quality.

This positionis locatedinSan Diego, CAand hasthework schedule of 4 days onsite and 1daywork from home.

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

Basic Qualifications:

• Bachelor's degreerequiredfrom an accredited, not-for-profit, in-person college/university

• A track recordof commitment to prior employers.

• 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

• Solid understanding of software design principles

• Experience with Git-based workflows

Preferred Qualifications:

• Practical experience using Claude for coding or code review

• Experience with Databricks

• Microservices or distributed systems experience

• CI/CD pipelines and DevOps practices

• Infrastructure-as-Code (Terraform, CloudFormation, CDK)

• Experience with additional AI coding tools

Whatsin it for you?

When you join CoStar Group,you1llexperience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed. We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training, and tuition reimbursement.

Our benefits package includes (but is not limited to):

• Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug

• Life, legal, and supplementary insurance

• Virtual and in person mental health counseling services for individuals and family

• Commuter and parking benefits

• 401(K) retirementplanwith matching contributions

• Employee stock purchase plan

• Paid time off

• Tuition reimbursement

• On-site fitness center and/or reimbursed fitness center membership costs (location dependent), with yoga studio, Pelotons, personal training, group exercise classes

• Access to CoStar Groups Employee Resource Groups

• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks

We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply.However, please note that CoStar Groupis not able toprovide visa sponsorship for this position.

This position offersa base salary range from $124,000to $187,000a year,determinedby relevant skills and experience, and a generous benefits plan.

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