LoopNet - Senior Full Stack Engineer

Loop Net - Senior Full Stack Engineer

Location: Irvine, CA

We are seeking an accomplished Senior Software Engineer to support multiple software products and brands across the organization. The role has a direct impact on highly visible web applications used by more than 10,000,000 users.

• Design and develop using Object‑Oriented design principles and software design patterns to achieve high reusability and maintainability.
• Write unit‑testable C# software.
• Develop a deep understanding of CoStar’s product architecture and frameworks.
• Maintain and contribute to CoStar’s product platform as necessary.
• Develop database stored procedures and SQL scripts/ETL jobs that meet CoStar database standards to implement product requirements.
• Participate and drive continuous improvement within Agile/Scrum teams.
• Build consensus among different teams working on software development projects.
• Facilitate discussions among other .NET and database developers to exchange new ideas and improvements.
• Continuously evaluate emerging technologies to identify opportunities, trends, and best practices that 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.
• Working knowledge of Vue, React, or Angular in Type Script.
• Experience with AWS S3, SQS, Dynamo, Elasti Cache, Apache Kafka, and Datadog.
• Use of AI coding tools for development, refactoring, and debugging (e.g., Claude Code, Git Hub Copilot).
• 7+ years of production development experience with C# .Net or .Net Core.
• Demonstrable track record of building and launching successful products and platforms.
• Deliver products that meet specifications and performance service level agreements.
• Deep understanding of business drivers for which you are building software.

• Experience in relational database design (MS SQL or MySQL) including performance tuning.
• Application security knowledge and experience with Git‑based workflows.
• Active role in mentoring developers and building consensus.
• Experience in unit, performance, and automation testing.

• Comprehensive healthcare coverage: medical, vision, dental, prescription drug, life, legal, and supplementary insurance.
• Virtual and in‑person mental health counseling services for individuals and families.
• 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; yoga studio; group exercise classes.
• Access to employee resource groups.
• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and healthy snacks.

Base Salary Range: $124,000 - $187,000, 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, sexual orientation, national origin, genetics, disability, age, or veteran status. We are an affirmative action employer. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation if you are unable or limited in your ability to use or access  as a result of your disability.

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