Lead Software Engineer- CoStar- Arlington, VA

CoStar Group•Arlington, VA

1d•Hybrid

About The Position

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.

Requirements

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

Nice To Haves

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

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

Benefits

Generous compensation and performance-based incentives
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