Senior Software Engineer; C#​/SQL- Research Development

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

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 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 , , , , and more. This position is located in our Richmond, VA office and offers a schedule of Monday‑Thursday in office and Friday work from home.

• 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 Dev Ops, and CI/CD pipelines for version control and deployment.
• Participate in Agile/Scrum ceremonies and contribute to incremental delivery and continuous improvement.

• Bachelor’s Degree required from an accredited, not for profit university or college.
• 5+ years of professional experience in software development using the Microsoft Stack, including C#, .NET Framework, .NET Core.
• 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 tools like 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 Dev Ops, Git, or other version control and build systems.
• Knowledge of JSON, XML, and API development standards.
• Familiarity with message brokers such as Rabbit
  
  MQ, SQS, Kafka, or Azure Service Bus.
• Strong analytical and problem‑solving skills with attention to detail and excellent communication skills.
• A track record of commitment to previous employers.

• Comfortable working across the stack with Node.js on the server‑side.
• Experience in unit, performance and automation testing.
• Experience with No
  
  SQL 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.

• 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…