Software Engineer II - Backend

Software Engineer II - Backend 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.

Description: We are seeking a Software Engineer II to join a new team building the next generation of back-end services, APIs and integrations in the finance tech organization. Initially this role will focus on the systems that move financial data between external platforms and our enterprise contracting system, integrating with existing APIs, message queues and SQL databases. You will help build configurable, reusable services that can be extended to new sources, systems and acquisitions through configuration rather than one-off, hard-coded integrations. You will also help standardize how data moves across our billing systems to allow for greater visibility into patterns, errors and optimizations across a payments flow of billions of dollars a year. This position is in  Richmond, VA and has a work schedule of Monday through Thursday in office and Friday work from home.

Contribute to technical discussions and architectural decisions aligned with business goals Design, develop, and maintain robust and scalable back-end applications and APIs using the Microsoft .NET technology stack, SQL and other data tools Champion maintainable, well-tested code and sound design: clear separation of concerns, loose coupling, and consistent use of established design patterns Collaborate with engineering, product, DevOps and DBA teams to deliver production systems and participate in code reviews Work from requirements through delivery, partnering with senior engineers and business stakeholders to turn business context into technical designs and development-ready specifications Basic Qualifications: Bachelor's degree required from an accredited, not-for-profit, in-person college/university Track Record of committment to prior employers 3+ years of professional experience in software development using strongly typed languages for server-side processing, such as C#, GoLang, Java or Node with TypeScript Strong experience with relational databases, including database design and performance optimization Experience building scalable APIs and system integrations across REST APIs, message brokers or event streams Experience building configurable, reusable frameworks that support multiple integrations or business processes rather than hard-coded, single-purpose implementations Strong understanding of CI/CD principles, infrastructure as code, automated deployment pipelines, and source control systems Strong analytical and problem-solving skills, with attention to detail and excellent communication skills Experience with agentic engineering and AI-assisted development tools (e.g., Claude Code, GitHub Copilot) to accelerate software delivery Preferred Qualifications: Exposure to serverless computing and event-driven architecture, including but not limited to RabbitMQ, SQS, Kafka, or Azure Service Bus Familiarity with