Senior Software Engineer

Job Description

Overview:

Group (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 for 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.

About  The  network offers the largest and most effective marketplaces to discover, buy and sell rural real estate. We connect 12 million active buyers and landowners with the best local real estate professionals every month across three platforms.

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This role is in our Austin, TX office with a hybrid schedule of 4 days on-site and 1 day work from home.

We are currently seeking a full-time Senior Software Engineer focused on AI-driven product development, modern React applications, and practical large language model (LLM) integration. As a senior member of the  engineering team, you will design, build, and support highly performant web applications and AI-enabled experiences that help drive the growth of our  business unit. The ideal candidate combines strong software engineering fundamentals with hands‑on experience applying AI-assisted development workflows, integrating LLM capabilities into production systems, and delivering reliable, scalable customer‑facing solutions.

• Design, build, support, and maintain production web applications using React, Type Script, CSS, JavaScript, C#, .NET, and SQL.
• Lead the development of AI-enabled product features that integrate LLM capabilities into existing business workflows, user experiences, and application services.
• Apply senior‑level engineering judgment to evaluate where AI creates meaningful customer or operational value and where traditional software solutions are more appropriate.
• Design and implement LLM integration patterns such as prompt orchestration, structured outputs, tool or API calling, fallback handling, and guardrails.
• Assist in establishing practices for AI-assisted and LLM-powered features, reliability, latency, cost, and user safety.
• Analyze technical requirements and design new components, services, web pages, and controls that meet functional, performance, scalability, availability, and maintainability requirements.
• Apply software design patterns, SOLID principles, secure coding practices, and sound quality management methods to create reusable, maintainable, well‑tested application software.
• Mentor engineers on modern development practices, AI-assisted engineering workflows, code quality, testing strategy, and responsible use of LLM tooling.
• Create thorough unit, integration, and functional test coverage for the software and AI-enabled features you own.
• Develop and maintain SQL database scripts, application data access patterns, and supporting services required by product features.

• Bachelor’s Degree required from an accredited, in‑person, not for profit university or college.
• A track record of commitment to prior employers.
• 6+ years of…