Senior Software Engineer; C#​/.NET

Senior Software Engineer (C#/.NET)

CoStar Group is a leading global provider of real estate information, analytics, and online marketplaces. The Product Data Services team is building backend services that power CoStar’s products across brands such as , , and CoStar. This role is located in San Diego, CA, and offers a work schedule of 4 days onsite, 1 day work from home.

• Build big, distributed, API‑driven systems that serve tens of thousands of users.
• Produce bullet‑proof code that is robust, efficient, and maintainable using C#, .NET Framework, JSON, SQL Server, and AWS.
• Drive and lead software design, development standards, and code reviews.
• Continuously evaluate emerging technologies to strengthen CoStar’s technology platform.

• Bachelor’s degree from an accredited college or university.
• 5+ years of deep .NET development (C#), including cross‑platform communication technologies such as Web API.
• 2+ years of database design, T‑SQL programming, and performance tuning.
• Experience designing and developing using Object Oriented design principles and software design patterns.
• Deliver work products that meet specifications, are defect‑free, and perform at high levels.
• Excellent software development and engineering skills on large‑scale, mission‑critical infrastructure applications.

• Facilitate discussions among developers to exchange ideas and introduce new technologies.
• Build consensus among technologists.
• Experience with .NET Core.
• Willingness to mentor other developers.
• Knowledge of NPM and NuGet.
• AWS or Azure experience.
• Experience with AI or Dev Tools.

• Generous compensation and performance‑based incentives.
• Comprehensive healthcare coverage:
  Medical, Vision, Dental, Prescription Drug, Life, Legal, and supplemental insurance.
• Virtual and in‑person mental health counseling services.
• Commuter and parking benefits.
• 401(K) retirement plan with matching contributions.
• Employee stock purchase plan.
• Paid time off and tuition reimbursement.
• On‑site fitness center and membership reimbursement.
• Diversity, Equity, & Inclusion employee resource groups.
• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and healthy snacks.

Base salary range: $143,600 – $201,700 based on relevant skills and experience.

CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug‑free workplace and perform pre‑employment substance abuse testing. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. CoStar is also committed to compliance with all fair employment practices regarding citizenship and immigration status.

We welcome all qualified candidates who are currently eligible to work full‑time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position.

The position offers a base salary range of $143,600-$201,700 based on relevant skills and experience and includes a generous benefits plan. #LI-AV1

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces.