Software Engineer II, Data Platform & AI

CoStar; Richmond (VA); On-site; USD 108,000 - 140,000; Full time

Benefits offered by this job

Comprehensive healthcare coverage: Med

Life, legal, and supplementary ins.

Mental health counseling (virtual/in‑p

Commuter and parking benefits

401(k) with matching

Employee stock purchase plan

Paid time off

Tuition reimbursement

On-site fitness center

Job summary

CoStar Group is seeking a Software Engineer on the Data Automation team to help expand the data platform that supports CoStar’s largest brands, including CoStar Suite, LoopNet, and Homes.com. You will build scalable, API‑driven systems and contribute to design decisions.

Ideal candidates have 4+ years in React JS and C#, strong SQL experience, and a background in distributed services within an agile environment.

Qualifications

• Bachelor’s Degree from an accredited university or college.
• 4+ years of experience with React JS and JavaScript.
• 4+ years of experience with C# and .NET Framework & Web API 2.0 development.
• 3+ years of experience with MS SQL Server or database design in T-SQL or PostgreSQL (programming/performance tuning).
• Experience architecting, designing, and building large-scale, distributed, services-oriented systems in an agile environment.
• Understanding of AI technologies and hands-on experience with AI tooling such as Claude Code, GitHub Copilot, Cursor, Gemini, or Grok.
• Data modeling experience.
• Commitment to prior employers.

Responsibilities

• Build large, distributed, API-driven systems used by tens of thousands of users.
• Produce robust, efficient, and maintainable code with React JS, C#, .NET Framework, AWS (DynamoDB, S3, Lambda), and SQL Server.
• Lead software design, development standards, and code reviews.
• Continuously evaluate emerging technologies to strengthen CoStar’s platform and develop best practices.

Skills

React JS

JavaScript

C#

.NET Framework

Web API 2.0

MS SQL Server

Database design

Distributed systems

Agile

AI tooling

Data modeling

Commitment to employers

Education

Bachelor's Degree

Job description

CoStar Group is seeking a Software Engineer on the Data Automation team to help expand the data platform that supports CoStar’s largest brands, including CoStar Suite, LoopNet, and Homes.com. You will build scalable, API‑driven systems and contribute to design decisions.

Ideal candidates have 4+ years in React JS and C#, strong SQL experience, and a background in distributed services within an agile environment.