Senior Software Engineer - Land.com

CoStar; Austin (TX); Hybrid; USD 131,000 - 170,000; Full time

Benefits offered by this job

Healthcare

401(K) Matching

Tuition reimbursement

On-site fitness center

Stock purchase plan

Job summary

CoStar Group, Land.com engineering, seeks a Senior Software Engineer focused on AI-driven product development, modern React apps, and LLM integration. You will design and support high-performance web experiences driving Land.com growth.

The ideal candidate brings 6+ years of production software experience, strong React/TypeScript/C#/.NET/SQL skills, and hands-on AI tooling expertise. This hybrid Austin-based role offers a competitive salary and benefits.

Qualifications

• Bachelor's degree in relevant field.
• 6+ years of production software development experience.
• Hands-on React, TypeScript, JavaScript ES6+, C#, .NET, and SQL.
• Experience with AI-assisted development and LLM APIs.
• Experience with testing: unit, integration, functional.
• Knowledge of SOLID, design patterns, API design, scalable architecture.
• Experience working in Kanban teams and cross-functional collaboration.
• Strong communication of decisions, risks, and tradeoffs.
• Mentor engineers and drive code quality and test strategy.
• Develop SQL scripts and data access patterns.

Responsibilities

• Design, build, 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.
• Evaluate where AI adds value and where traditional solutions are better.
• Design and implement LLM integration patterns and guardrails.
• Help establish practices for AI-assisted features, reliability, latency, cost, and safety.
• Analyze requirements and design components, services, and pages meeting performance and maintainability needs.
• Apply SOLID principles, design patterns, secure coding, and quality gates to code.
• Mentor engineers on modern development practices and AI workflows.
• Create unit, integration, and functional tests for AI-enabled features.
• Develop and maintain SQL data access patterns and supporting services.

Skills

React

TypeScript

JavaScript ES6+

C#

.NET

SQL

AI tooling

LLM APIs

Testing

SOLID

Kanban

Communication

Mentoring

Education

Bachelor’s Degree

Tools

Visual Studio

Azure DevOps

Git

CI/CD pipelines

Elasticsearch

OpenSearch

Job description

Overview

Job Description

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.

Preferred Skills

• Self‑starter with a strong product mindset and a desire to solve business problems with the help of others.
• Deep understanding of React architecture, component design, state management, accessibility, and performance optimization.
• Experience architecting systems using C#, .NET, SQL, REST APIs, and service‑oriented application patterns.
• Experience with Visual Studio, Azure DevOps, Git, CI/CD pipelines, code review practices, and automated quality gates.
• Experience with Elasticsearch, OpenSearch, cloud services, or other search and retrieval technologies.
• Familiarity with responsible AI practices, secure AI integration, data privacy considerations, and guardrails for customer‑facing AI features.

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, and tuition reimbursement.

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 Employee Resource Groups
• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks

This position offers an annual salary range from $131,000 - $170,000 determined by relevant skills and experience, in addition to a generous benefits plan.

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.

#CoStar

CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing