Associate Software Engineer - Arlington, VA

CoStar Group, Inc.; Arlington (VA); Hybrid; USD 100,000 - 105,000; Full time

Benefits offered by this job

Healthcare coverage

Mental health counseling

Commuter benefits

Parking benefits

401(k) matching

Employee stock purchase plan

Paid time off

Tuition reimbursement

On-site gym

Snacks and beverages

Employee Resource Groups

Job summary

CoStar Group, Inc. in Arlington, VA is seeking an Associate Software Engineer to design and build modern web applications. You’ll contribute to our portfolio across Homes.com, CoStar.com, Apartments.com and LoopNet.com, writing clean code, developing tests, and participating in code reviews.

You will work with a team using JavaScript frameworks, .NET, SQL, AWS, and AI‑powered tools, gaining hands‑on experience and career growth in a fast‑paced environment.

Qualifications

• Pursuing a bachelor’s degree in CS/Software Engineering with graduation Dec 2026–Jun 2027.
• GPA at least 3.0 and 2+ months of internship or co‑op experience.
• Experience applying software engineering fundamentals via coursework or projects.
• Ability to discuss internship, project work, approach and outcomes.

Responsibilities

• Collaborate with engineers to write clean, maintainable code and develop tests.
• Participate in code reviews and design discussions for scalable web apps.
• Contribute to frontend and backend work, leveraging React/Vue/Angular and .NET stacks.
• Apply solid software engineering practices to deliver high‑quality solutions.

Skills

Software engineering fundamentals

Internship experience

Academic projects

Problem solving

Education

Bachelor's degree in Computer Science / Software Engineering

Job description

Associate Software Engineer – Arlington, VA

Job Description

Company 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. Learn more about CoStar.

Role Description

We’re looking for an Associate Software Engineer with a passion for designing and building modern web applications. This role develops tools that power CoStar Group’s proprietary platform, supporting sales and research teams across our portfolio of brands - including Homes.com, CoStar.com, Apartments.com, and LoopNet.com. At CoStar Group, we invest in early-career talent by providing hands‑on learning opportunities, meaningful responsibilities, and clear pathways for professional growth. You'll be empowered to contribute ideas, solve complex challenges, and develop both the technical and collaborative skills needed to thrive in a fast‑paced, innovative environment. CoStar Group offers competitive compensation, comprehensive benefits, performance‑based career advancement, and the opportunity to help shape products that serve millions of users. This position is located inArlington, VAand offers a schedule of Monday to Thursday in office and the option to work from home on Friday.

What You’ll do

At CoStar Group, our engineering teams build innovative, scalable solutions while following industry best practices for software development. You'll collaborate with experienced engineers to write clean, maintainable code, develop automated tests, participate in code reviews, and contribute to cross‑functional design and planning discussions. Working alongside talented teammates, you'll gain hands‑on experience with modern technologies including but not limited to leading JavaScript programming language and frameworks such as React, Vue, and Angular, Typescript, backend development language .NET, .NETCore, SQL, NoSQL, Postgres, AWS, Kafka, Databricks, and emerging AI-powered development tools like GitHub Copilot and Claude Code. We're looking for curious, adaptable students who are eager to learn, embrace new technologies, and apply strong software engineering fundamentals to solve meaningful business challenges. This role provides the building blocks for a strong and rewarding technical career, offering mentorship, real‑world experience, and continuous opportunities for professional growth.

Basic Qualifications

Currently pursuing a bachelor’s degree from an accredited, not-for-profit university or college in Computer Science, Software Engineering, or a comparable major. Must have an expected graduation date of December 2026 - June 2027. Minimum 3.0 cumulative GPA. At least 2 months of previous relevant internship or co‑op experience. Experience applying software engineering fundamentals through coursework, projects, internships, or work experience. Ability to discuss prior internship, project, or academic work, including the problem solved, technical approach, collaboration, and outcomes.

Preferred Qualifications and Experiences

Experience writing understandable, maintainable, and well‑documented code. Interest in learning new technologies and building high‑quality software. Demonstrated initiative and collaboration through academic, internship, extracurricular, or team‑based experiences. Familiarity with Agile development practices, the Software Development Lifecycle, APIs, web services, or application design concepts. Exposure to programming languages, databases, cloud concepts, AI/machine learning, frameworks, or other technical tools through coursework, projects, internships, or personal learning.

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. We offer a benefits package that includes but is not limited to the following items:

• 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)
• Access to CoStar Group’s Employee Resource Groups
• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks
• Base Compensation: $100,000 - $105,000 annually

The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies.

Equal Employment Opportunity Statement

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 Group is an Equal Employment Opportunity Employer; we maintain a drug‑free workplace and perform pre‑employment substance abuse testing Founded in 1987, CoStar Group, Inc. (Nasdaq:CSGP) is the leading provider of commercial real estate information, analytics and online marketplaces. CoStar conducts expansive, ongoing research to produce and maintain the largest and most comprehensive database of commercial real estate information. CoStar data powers the $17 trillion world of real estate – delivering the sale, lease, property, tenant, contact, reporting and industry information that makes connections happen. We help our clients make smart investments and decisions. Eighty‑three percent of the nation’s commercial real estate transactions involve a CoStar subscriber, and the top 95% of the leading 1,000 brokerage firms use CoStar to inform their decisions. We also help create lasting experiences through our family of marketplaces. In addition to CoStar, CoStar Group brands and marketplaces include LoopNet, Apartments.com, BizBuySell, and Lands of America – collectively attracting more than 25 million monthly unique visitors. The Apartments.com Network is the nation’s #1 most visited apartment listing network, with 45 million monthly visits, allowing renters to find their perfect homes. LAND.com connects landowners to their perfect properties, spots and open spaces. BizBuySell allows small business owners to bring their dreams to life. And LoopNet connects investors, sellers and brokers with clients who fall in love with their properties.

Headquartered in Washington, DC, CoStar maintains offices throughout the U.S. and in Europe and Toronto, Canada with a staff of approximately 3,700 worldwide, including the industry's largest professional research organization. CoStar is committed to creating a diverse environment and is proud to be an equal opportunity workplace and affirmative action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. CoStar is also committed to compliance with all fair employment practices regarding citizenship and immigration status. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation if you are unable or limited in your ability to use or access www.costargroup.com/careers as a result of your disability. You can request reasonable accommodations by calling 1-855-840-1715 or by sending an email to [e-mail].