Lead Software Engineer- CoStar Suite- Arlington, VA

CoStar Group•Arlington, VA

2d•Hybrid

About The Position

CoStar Group is seeking a Lead Software Engineer to lead development of a greenfield, enterprise-scale web application infused with AI. The role will drive AI-powered product experiences and help shape AI-first engineering workflows, while architecting and innovating intelligent applications at scale. The position is based in Arlington, Virginia, with onsite work Monday through Thursday and the option to work from home on Friday. The engineer will develop and maintain an in-depth working knowledge of the commercial real estate industry and CoStar’s business model and technology. The role also includes evaluating emerging technologies and influencing engineering practices, team development, and the future direction of CoStar’s technology platform.

Requirements

Bachelor’s degree from an accredited, not-for-profit, in-person university or college.
8+ years of production development experience in modern technologies such as React, Vue, TypeScript, Node.js, C#, .NET, OpenSearch, Kafka, SQL, or NoSQL.
Track record of commitment to prior employers.
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 such as AWS and cloud managed services.
Experience with Agile/Scrum processes and continuous delivery practices.
Experience in unit, performance, and automation testing.
Deep understanding of the business drivers for the software being built.
Ability to mentor developers and build consensus.

Nice To Haves

Experience managing a large enterprise-level code base, code quality, and dependencies.
Experience with C#, Node.js, and/or React in particular.
Experience building agents and workflows using modern AI patterns.
Ability to leverage vibe coding to improve productivity and quality.
Excellent written and verbal communication skills.
Commercial real estate knowledge.

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 technologies such as React, Node.js, and Tailwind.
Work with cloud-native services, containers, and microservices.
Optimize for performance, observability, and developer productivity.
Leverage AI tooling and automation, including CI/CD, code generation, and test generation.
Influence and establish AI-first engineering practices, including vibe coding, human-in-the-loop workflows, and debugging.
Establish an AI culture through team upskilling and redefining the development lifecycle.
Continually evaluate emerging technologies, opportunities, trends, and best practices to strengthen CoStar’s technology platform and development practices.
Develop and maintain an in-depth working knowledge of the commercial real estate industry and CoStar’s business model and technology.
Mentor developers and build consensus.

Benefits

Generous compensation and performance-based incentives.
Comprehensive medical, vision, dental, and prescription drug coverage.
Life, legal, and supplementary insurance.
Virtual and in-person mental health counseling services for individuals and families.
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, depending on location; facilities and offerings may include a yoga studio, Pelotons, personal training, and group exercise classes.
Access to CoStar Group’s Employee Resource Groups.
Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks.
Investment in professional and academic growth.