Lead Software Engineer- CoStar- Arlington, VA
Job Description
Overview
CoStar Group 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.
CoStar
CoStar is the global leader in commercial real estate information, analytics and news. Commercial Real Estate industry professionals around the globe use CoStar to access the most comprehensive data to make decisions with confidence. CoStar delivers immediate, verified commercial real estate information on over 5.9 million properties across every market. Learn more about
CoStar
.
About the Role
As CoStar’s next Lead Software Engineer, you will lead the build of a
greenfield, enterprise-scale web application infused with AI
, leveraging modern technologies and frontier models. Drive the development of
AI-powered product experiences
while shaping
AI-first engineering workflows
that redefine how software is built. This is a high-impact role to
architect, innovate, and influence the future of intelligent applications at scale.
This position is located in
Arlington, VA
and is in onsite Monday – Thursday, with the option to work from home on Friday.
Responsibilities
Architect scalable, resilient distributed systems — defining service boundaries, data contracts, and cross-team API standards for an enterprise-scale platform
Build responsive, high-performance applications using React, Node.js, Tailwind, etc.
Work with
cloud-native services
(Azure/AWS/GCP), containers, and microservices
Optimize for
performance, observability, and developer productivity
Leverage
AI Tooling & Automation (CI/Cd, code generation, test generation)
Influence and establish
AI-first engineering practice
(vibe coding, human-in-the-loop, debugging)
Establish
AI Culture & Mentorship
(team upskilling, lifecycle redefinition)
Continually evaluate emerging technologies to identify opportunities, trends and best practices that can be used to strengthen CoStar’s technology platform and development practices
Develop and maintain an in-depth working knowledge of the CRE Industry and CoStar’s business model / technology
Basic Qualifications
Bachelor’s Degree required from an accredited, not for profit, in-person university or college.
A track record of commitment to prior employers
8+ years of production development experience in modern technologies, like React, Vue, TypeScript, NodeJS, C#, .Net, OpenSearch, Kafka, SQL, NoSQL
A demonstrable track record of building and launching successful products and platforms
Experience designing for high availability, horizontal scalability, and production observability at enterprise scale
Experience with cloud technologies like AWS, Cloud Managed Services, etc.
Experience in Agile/Scrum processes, and Continuous delivery practices
Experienced in unit, performance, and automation testing
Deeply understand what drives the business for which you are building software
Take an active role in mentoring developers with ability to build consensus
Preferred Qualifications and Skills
Experience managing a large Enterprise level code base, code quality and dependencies
Experience with C#, NodeJS, and/or React in particular
Build Agents and Workflows using modern AI patterns
Leverage Vibe coding to improve productivity and quality
Excellent written and verbal communication skills
Commercial Real Estate (CRE) knowledge is a bonus
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.
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
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.
#LI-MC5
CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing