Senior Software Engineer- CoStar Suite- Arlington, VA

Redefining Real Estate through AI-First Engineering

CoStar Group is launching a massive greenfield project to overhaul the global commercial real estate landscape with an AI-infused enterprise platform. As a Senior Software Engineer, you will move beyond traditional development to help establish a new standard for intelligent applications. This role is based in Arlington, VA, offering a collaborative four-day onsite schedule with a focus on high-impact architectural decisions.

Champion the Vibe Coding Revolution

This position is specifically designed for developers who have mastered AI-assisted development. You will be responsible for:

• Architecting AI-First Workflows: Implementing vibe coding, human-in-the-loop debugging, and agentic build patterns.
• Modern Tech Stack: Building resilient, distributed systems using React, Node.js, TypeScript, and C#/.Net.
• Cultural Leadership: Mentoring the team on leveraging LLMs to accelerate the software development lifecycle from design to deployment.

Innovation at Scale

You will join a sophisticated environment utilizing cloud-native services, Kafka, and OpenSearch to handle massive data streams. This is an opportunity to lead the transition from manual coding to AI-augmented engineering, ensuring that developer productivity and software quality reach unprecedented levels through intelligent automation.