Costar Group
Provides commercial real estate data, analytics, and marketing services.
Senior Software Engineer (C#/.NET/React)
Develop and maintain large-scale C#/.NET and React systems for real estate data platforms.
Job Highlights
About the Role
• Build large, distributed, API‑driven systems for tens of thousands of users • Write robust, efficient, maintainable code using React, C#, .NET, AWS (DynamoDB/S3/Lambda), and SQL Server • Lead software design, set development standards, and conduct code reviews • Evaluate emerging technologies to improve CoStar’s platform and practices • Architect large‑scale, distributed, service‑oriented systems in an agile environment
Key Responsibilities
- ▸api development
- ▸distributed systems
- ▸full-stack
- ▸design leadership
- ▸tech evaluation
- ▸system architecture
What You Bring
• Bachelor’s degree from an accredited, not‑for‑profit institution • 4+ years experience with React JS/JavaScript • 4+ years experience with C#, .NET Framework and Web API 2.0 • 3+ years experience with MS SQL Server or T‑SQL design and performance tuning • Data modeling expertise • Strong communication skills with business and technical stakeholders • Knowledge of cloud platforms (Azure or AWS) • Advanced SQL querying and data modeling (conceptual, logical, physical) • Experience with RESTful web services
Requirements
- ▸bachelor's
- ▸reactjs
- ▸c#
- ▸sql server
- ▸azure
- ▸data modeling
Benefits
CoStar promotes a collaborative and innovative culture, providing the brightest minds with top‑tier resources to deliver value to customers, employees, and investors. Employees benefit from generous compensation, performance‑based incentives, and extensive professional development opportunities such as internal training, tuition reimbursement, and an inter‑office exchange program. The company offers a comprehensive benefits package that includes health, vision, dental, and prescription coverage, life and supplemental insurance, 401(k) matching, stock purchase plans, paid time off, commuter benefits, and on‑site or reimbursed fitness facilities. CoStar is an equal‑opportunity employer, welcomes all qualified U.S. candidates, and does not sponsor visas for this role. • Collaborative, innovative culture with performance‑based compensation • Tuition reimbursement, internal training, and inter‑office exchange program • Comprehensive health, vision, dental, and prescription coverage; life, legal, and supplemental insurance • 401(k) with matching contributions and employee stock purchase plan • Paid time off, commuter/parking benefits, and on‑site or reimbursed fitness facilities • Access to Diversity, Equity & Inclusion employee resource groups and complimentary snacks
Work Environment
Office Full-Time