Senior Software Engineer - Land.com

costar; United States; Hybrid; USD 140,000 - 170,000; Full time

Benefits offered by this job

Health insurance

401(k)

Job summary

CoStar Group's Land.com team in Austin, TX is seeking a Senior Software Engineer focused on AI-driven product development, modern React apps, and LLM integration. You will design, build, and support high-performance web applications and AI-enabled experiences.

The role requires 6+ years of experience, hands-on React/TypeScript/JavaScript, and proven ability to mentor peers, deliver reliable features, and collaborate across product, design, QA and engineering teams.

Qualifications

• Bachelor's degree required from an accredited university.
• 6+ years of professional software development experience in production environments.
• Experience with React, TypeScript, JavaScript, C#, .NET, and SQL.
• Experience integrating LLM APIs or AI services into production code.
• Strong testing practices and software design knowledge.

Responsibilities

• Design, build, support, and maintain production web applications using React, TypeScript, CSS, JavaScript, C#, .NET, and SQL.
• Lead the development of AI-enabled features that integrate LLM capabilities into workflows and services.
• Apply senior-level engineering judgment to determine where AI adds value.
• Design and implement LLM integration patterns such as prompt orchestration and guardrails.
• Help establish practices for AI-assisted features, reliability, latency, and cost.
• Analyze requirements and design components meeting performance and maintainability.
• Apply SOLID principles, design patterns, secure coding, and testable software.
• Mentor engineers on modern development practices and AI workflows.
• Create unit, integration, and functional test coverage for software.
• Develop and maintain SQL scripts and data access patterns.

Skills

React

TypeScript

JavaScript ES6+

C#

.NET

SQL

AI-assisted development

LLM integration

Unit testing

Code quality

Mentoring

Communication

Education

Bachelor's Degree

Job description

Senior Software Engineer - Land.com

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 Land.com:

The Land.com 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.

Learn more about Land.com

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 Land.com engineering team, you will design, build, and support highly performant web applications and AI-enabled experiences that help drive the growth of our Land.com 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.

Key Responsibilities:

• Design, build, support, and maintain production web applications using React, TypeScript, 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.

Required Skills:

• 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 professional software development experience in production environments, including ownership of complex systems or product features.
• Hands-on experience with React, TypeScript, JavaScript ES6+, C#, .NET, and SQL.
• Practical experience using AI-assisted development tools and workflows to improve engineering productivity, code quality, testing, documentation, or delivery speed.
• Experience integrating LLM APIs or AI services into application code, including prompt design, structured outputs, error handling, and production monitoring.
• Experience with software testing practices such as unit, integration, functional, regression and performance testing.
• Demonstrated knowledge of SOLID principles, design patterns, API design and scalable application architecture.
• Experience working within Kanban-oriented engineering teams with strong collaboration across product, design, QA and engineering stakeholders.
• Ability to clearly communicate technical decisions, risks, tradeoffs and implementation plans within and across teams.
• Ability to lead work independently, mentor other engineers, manage competing priorities and deliver high-quality outcomes with minimal supervision