Senior Software Engineer (C#/SQL)- Research Development

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 and the NASDAQ 100, 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.    

We are seeking an accomplished Senior Full-Stack Software Engineer who excels at designing and architecting modern web applications. This engineer would support our Web Enterprise team in building the software tools that power our proprietary CRM platform and support our sales and research teams across Homes.com, Costar.com, Apartments.com, LoopNet.com, and more. 

This position is located in our Richmond, VA office and offers a schedule of Monday-Thursday in office and Friday remote.  

Responsibilities 

• Lead technical discussions and make critical architectural decisions aligned with business goals. 

• Design, develop, and maintain robust and scalable applications using the Microsoft .NET technology stack (.NET Core, ASP.NET Core, C#, MSSQL). 

• Implement and optimize SQL queries, stored procedures, and database schemas for performance. 

• Implement solutions using modern architecture paradigms including microservices, domain-driven design (DDD), and event-driven systems. 

• Guide teams in adopting best practices in .NET Core, C# and SQL. 

• Ensure adherence to SOLID principles, design patterns, and clean coding standards. 

• Develop proof-of-concepts (POCs) to evaluate new tools and frameworks. 

• Collaborate with cross-functional teams, participate in code reviews, and mentor junior developers. 

• Analyze business requirements and translate them into technical designs and development-ready specifications. 

• Apply secure coding practices, including integration of OAuth, OpenID Connect, and other authentication/authorization frameworks. 

• Use Git, TFS, Azure DevOps, and CI/CD pipelines for version control and deployment. 

• Participate in Agile/Scrum ceremonies and contribute to incremental delivery and continuous improvement. 

Qualifications 

• Bachelor’s Degree required from an accredited, not for profit university or college. 

• 6+ years of professional experience in software development using C#, .NET Framework, .NET Core. 

• Must have strong experience with MS SQL Server, including relational database design and performance tuning. 

• Hands-on experience with Entity Framework for efficient data modeling and data access. 

• Experience with ASP.NET Web API, and RESTful service design. 

• Familiarity with microservices architecture and containerization using Docker and Kubernetes. 

• Experience with AWS or similar cloud platforms (Azure, GCP). 

• Strong understanding of CI/CD principles, infrastructure as code, and automated deployment pipelines. 

• Proficiency with Azure DevOps, Git, and other version control and build systems. 

• Knowledge of JSON, XML, and API development standards. 

• Familiarity with message brokers such as RabbitMQ, SQS, Kafka, or Azure Service Bus. 

• Strong analytical and problem-solving skills with attention to detail and excellent communication skills. 

• Experience in unit, performance and automation testing. 

• A track record of commitment to previous employers. 

Preferred Qualifications 

• Comfortable working across the stack with Node.js on the server-side. 

• Experience with NoSQL databases and API Gateway technologies. 

• UX/UI experience with modern frameworks like React is a plus. 

• Experience with Identity & Access Management, like OAuth, JWT. 

• Exposure to serverless computing and event-driven architectures. 

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, tuition reimbursement, and an inter-office exchange program.  

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 Diversity, Equity, & Inclusion 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.  

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