> Markdown version of [/jobs/ext/3860348-lead-software-engineer-costar-suite-arlington-va](https://www.wearedevelopers.com/jobs/ext/3860348-lead-software-engineer-costar-suite-arlington-va). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Lead Software Engineer- CoStar Suite- Arlington, VA

- **Company:** Ten-X, LLC
- **Location:** Arlington, VA, United States (Remote available)
- **Experience:** Expert
- **Salary:** $145,000.0 - $222,000.0
- **Contract:** Permanent contract
- **Skills:** .NET Framework, Artificial Intelligence, Amazon Web Services, Automation of Tests, Microsoft Azure, C Sharp (Programming Language), Cloud Computing, Code Generation, Software Quality, Continuous Delivery, Continuous Integration, Software Debugging, Distributed Systems, Node.Js, NoSQL, Cloud Services, Software Construction, SQL Databases, TypeScript, Web Applications, Tailwind, ReactJS, System Availability, Vue.js, Apache Kafka, Codebase, Front End Software Development, Serverless Computing, Human in the Loop, OpenSearch, Microservices
- **Published:** October 22, 2026
- **Apply:** https://costar.wd1.myworkdayjobs.com/CoStarCareers/job/US-VA-Arlington/Lead-Software-Engineer--CoStar-Suite--Arlington--VA_R40182

## About the Role

* 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

## Description

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