LoopNet - Senior Software Engineer; C#​/.NET

Senior Software Engineer (C#/.NET) – Loop Net

Location:

Irvine, CA. Work arrangement: 4 days on‑site, 1 day remote. Join Loop Net as a Senior Software Engineer to develop and maintain enterprise web applications serving over 10 million users.

• Design and develop enterprise applications using software design principles/patterns to attain high reusability and maintainability.
• Write unit‑testable software in C#.
• Develop an in‑depth understanding of CoStar’s product architecture and frameworks; maintain and contribute to the product platform as needed.
• Develop database stored procedures and SQL scripts that meet CoStar database standards to implement product requirements.
• Participate and drive continuous improvement within CoStar’s Agile/Scrum teams.
• Build consensus among different teams working on software development projects.
• Facilitate discussions among peer .NET and database developers to exchange new ideas and improvements.
• Continually evaluate emerging technologies to identify opportunities, trends and best practices that can strengthen CoStar’s technology platform and development practices.

• Bachelor’s degree from an accredited, not‑for‑profit university or college.
• Track record of commitment to prior employers.
• 7+ years of production‑development experience with .NET or .NET Core.
• Experience with AWS cloud technologies (file storage, data storage, search, cache), Apache Kafka.
• Frontend working knowledge of Vue, React, or Angular with Type Script.
• Demonstrable track record of building and launching enterprise products/platforms.
• Develop products that meet specifications and performance SLAs; experience in unit, performance, and integration tests.
• Experience with Git‑based workflows.
• Deep understanding of enterprise application business logic.

• Experience in relational database design (MS SQL or MySQL) including performance optimization and No
  
  SQL design.
• Application security knowledge.
• Leverage AI coding tools for development, refactoring, and debugging (Claude Code, Git Hub Copilot, or equivalent).

• Base salary range: $124,000–$187,000 (based on relevant skills and experience).
• Comprehensive healthcare coverage: medical, vision, dental, prescription drug.
• Life, legal, and supplementary insurance.
• Virtual and in‑person mental health counseling services for individuals and family.
• Commuter and parking benefits.
• 401(k) retirement plan with matching contributions.
• Employee stock purchase plan.
• Paid time off.
• Tuition reimbursement.
• On‑site fitness center and/or reimbursed fitness center membership costs (location dependent) including yoga studio, Peloton, personal training, group exercise classes.
• Access to CoStar Group’s Employee Resource Groups.
• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks.

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.

CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug‑free workplace and perform pre‑employment substance abuse testing.