Senior Software Engineer

costar; United States; Hybrid; USD 130,000 - 170,000; Full time

Job summary

CoStar Group, a leading real estate information provider, seeks a Senior Software Engineer for its Sales Development team. You will build customer-facing CRM features, design AI-powered solutions, and integrate intelligent workflows across CoStar brands.

The role focuses on building robust applications with React, TypeScript, C#, and AWS, while driving best practices and collaboration with Product, Sales, and Data teams.

Qualifications

• 6+ years of software development experience with OOP languages.
• Experience architecting large-scale distributed, service-oriented systems and web apps in agile environments.
• Experience building RESTful APIs using C#.
• Proficiency with Git versioning tools.
• Understanding AI technologies and hands-on AI adoption and development.
• Familiarity with large language models (LLMs) and prompt engineering.
• Familiarity with CI/CD deployment processes.

Responsibilities

• Build customer-facing web apps using React and TypeScript.
• Design and implement AI-powered software solutions to enhance customer experience and product capabilities.
• Integrate AI skills, agents, tools, and workflows into internal and customer-facing systems.
• Produce robust, maintainable code using C#, .NET, SQL Server, and AWS.
• Use telemetry to identify anomalies and optimize performance and reliability.
• Lead software design, development standards, and code reviews.
• Collaborate with Product, Sales, and Data teams to create business value.

Skills

React

TypeScript

C#

REST APIs

Git

AI

LLMs

CI/CD

Distributed systems

Education

Bachelor's Degree

Tools

AWS

SQL Server

DynamoDB

Lambda

SQS

Job description

Senior Software Engineer

Job Description

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.

Our team is responsible for building software in support of CoStar Group's sales teams. We think big, building innovative CRM features that empower our sales teams' success. We are a collaborative group with a mix of native mobile, data, API / platform, and front-end skills, and we are working to drive our company's future with our proprietary CRM system. We are hiring a Senior Software Engineer to join our Sales Development team and contribute to our AI initiatives within our CRM platform.

CoStar is investing heavily in artificial intelligence to accelerate software delivery, improve platform observability, automate research and business workflows, enhance product experiences through intelligent agents and skills, and improve data quality across enterprise systems. Successful candidates will demonstrate a willingness to learn, adopt, and apply AI technologies responsibly to solve complex business and engineering challenges.

This position is located in Richmond, VA and offers a schedule of Monday to Thursday in office and the option to work from home on Friday.

Responsibilities

• Building customer-facing web applications using React and TypeScript.
• Design and implement AI-powered software solutions that enhance the customer experience, improve platform intelligence, and unlock new product capabilities across CoStar brands.
• Build and integrate AI skills, agents, tools, and intelligent workflows into internal systems and customer-facing applications.
• Produce bullet-proof code that is robust, efficient, and maintainable; our primary tools are C#, .NET Framework, SQL Server, AWS.
• Utilize AI models to enhance monitoring, replayability, observability, and diagnostic capabilities to improve system reliability, accelerate problem resolution, and reduce operational risk.
• Implement telemetry-driven solutions that proactively identify anomalies, performance bottlenecks, and potential customer-impacting issues.
• Drive and lead software design, development standards, and code reviews.
• Build intelligent automation solutions that streamline research workflows, improve information discovery, and increase operational efficiency across business functions.
• Collaborate with Product, Sales, and Data teams to identify opportunities where AI-driven automation can create business value and improve decision-making.
• Continually evaluate emerging technologies to identify opportunities, trends, and best practices that can be leveraged to strengthen CoStar's technology platform and develop best practices.
• Develop comprehensive application testing procedures to ensure high-quality applications for tens of thousands of users.

Basic Qualifications

• Bachelor's Degree required from an accredited, not-for-profit, in-person college / university
• 6+ years of software development experience with OOP languages
• Demonstrated experience in architecting, designing and building large scale distributed, service-oriented systems and web applications in an agile environment
• Experience building RESTful APIs using C#
• Proficient understanding of code versioning tools such as Git.
• Understanding AI technologies and has hands-on experience in AI adoption and development.
• Familiarity with large language models (LLMs), prompt engineering, or agent-based architectures.
• Familiarity with CI/CD deployment processes
• A track record of commitment to prior employers

Preferred Qualifications and Skills

• Strong communication skills (to both business and technical partners).
• SQL and database development knowledge.
• Familiarity with AWS PaaS services such as Lambda, DynamoDB, and SQS.
• Data modeling experience from conceptual, logical, and physical designs.
• Experience implementing AI agents, workflow automation platforms, or intelligent search solutions.
• Experience applying AI-assisted software development practices to improve engineering productivity and code quality.

What's in it for you?

When you join CoStar Group, you'll e