Senior Software Engineer

Senior Software Engineer

Job Description

Overview:

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives.

We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate.

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 position is located in San Diego, CA and has the work schedule of 4 days onsite and 1 day work 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 degree required from an accredited, not-for-profit, in-person college/university

A track record of 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

What’s in it for you?

When you join CoStar Group, you’ll experience 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) retirement plan with 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 Group’s 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 Group is not able to provide visa sponsorship for this position.

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

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CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing