Costar Group
Provides commercial real estate data, analytics, and marketing services.
Senior .NET Software Engineer
Build and maintain large-scale .NET backend services on AWS for real estate platforms.
Job Highlights
About the Role
• Build distributed, API‑driven systems serving tens of thousands of users • Write robust, efficient, maintainable code using C#, .NET Framework, JSON, SQL Server, and AWS • Lead software design, development standards, and code reviews • Evaluate emerging technologies to improve CoStar’s platform and practices • Design and develop using OOP principles and design patterns for reusability and maintainability • Deliver defect‑free, performant work products that meet specifications • Facilitate developer discussions, introduce new technologies, and build consensus
Key Responsibilities
- ▸api systems
- ▸code development
- ▸design leadership
- ▸tech evaluation
- ▸oop design
- ▸quality delivery
What You Bring
• Bachelor’s degree in Computer Science or related field from an accredited, not‑for‑profit university • Proven track record of launching products/platforms handling terabytes of data for millions of users • 5+ years deep .NET (C#) development experience, including Web API • 3+ years of database design, T‑SQL programming, and performance tuning • Experience with application performance testing and unit testing strategies • Strong software development skills for large‑scale, mission‑critical infrastructure applications • Solid understanding of HTTP concepts (status codes, headers, etc.) • Demonstrated commitment to prior employers • Experience with .NET Core • Willingness to mentor other developers • Knowledge of NPM and NuGet • Experience with AWS or Azure
Requirements
- ▸bachelor's
- ▸.net
- ▸.net core
- ▸t‑sql
- ▸unit testing
- ▸aws
Benefits
CoStar offers a collaborative and innovative culture, competitive compensation, performance‑based incentives, and extensive professional development opportunities including internal training and tuition reimbursement. Employees receive comprehensive health coverage, 401(k) matching, stock purchase options, generous paid time off, and wellness resources such as fitness centers and mental‑health counseling. • Collaborative, innovative culture with professional growth opportunities • Competitive compensation and performance‑based incentives • Internal training and tuition reimbursement • Comprehensive healthcare: medical, vision, dental, and prescription drug coverage • Life, legal, and supplemental insurance • Virtual and in‑person mental‑health counseling for individuals and families • Commuter and parking benefits • 401(k) plan with matching contributions • Employee stock purchase plan • Paid time off • On‑site or reimbursed fitness center membership with yoga, Peloton, and group classes • Access to Diversity, Equity & Inclusion employee resource groups • Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and healthy snacks
Work Environment
Office Full-Time