Software Engineer; JavaScript/C#/.NET
Irvine, Orange County, California, 92713, USA
Listed on 2025-12-07
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Software Development
Software Engineer, Full Stack Developer
Overview
CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. is the nation’s #1 rental marketplace for owners, property managers and consumers. Our team is seeking an accomplished Software Engineer to join our team in supporting multiple software products and brands across the organization. You will have a direct impact on highly visible web applications that touch millions of users.
This position is located in Irvine, CA and offers 4 days a week onsite with 1 day work from home.
- Design and develop software using object‑oriented design principles and software design patterns to attain high reusability and maintainability.
- Write unit‑testable software with C#.
- Develop an in‑depth 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 CoStar’s 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 can be used to strengthen CoStar’s technology platform and development practices.
- Bachelor’s Degree required from an accredited, not‑for‑profit, in‑person college/university.
- A track record of commitment to prior employers.
- 2+ years of production development experience with C# .Net (or .Net Core).
- Demonstrate working knowledge of Vue, React or Angular in Type Script.
- A demonstrable track record of building and launching successful products and platforms.
- Deliver products that meet specifications and performance SLA.
- Experience in unit, performance, and automation testing.
- Deeply understand what drives the business for which you are building software.
- Take an active role in mentoring developers with the ability to build consensus.
- Experience in relational database design (MS SQL or MySQL) including performance tuning.
- Experience with AWS S3, SQS, Dynamo, Elasti Cache, Apache Kafka and Datadog.
We offer you generous compensation and performance‑based incentives. CoStar Group also invests in your professional and academic growth with internal training, tuition reimbursement, and an inter‑office exchange program. Our benefits package includes (but is not limited to):
- 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), with yoga studio, Peloton, personal training, group exercise classes.
- Access to CoStar Group’s Diversity, Equity, & Inclusion Employee Resource Groups.
- Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks.
CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug‑free workplace and perform pre‑employment substance abuse testing. CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. 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. 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. You can request reasonable accommodations by calling or by sending an email to
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