Senior Software Engineer; C#​/.NET​/Typescript

Senior Software Engineer (C#/.NET/Typescript) Overview

CoStar Group is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. , a CoStar Group brand, is one of the fastest growing real estate portals in the industry, serving millions of users worldwide. We are building an innovative brand at the cusp of defining the home‑buying experience and seeking talented engineers to help us scale and improve our web applications.

• Design and develop high‑performance web applications for hundreds of thousands of users globally.
• Promote consistent architecture patterns within and across development teams.
• Craft elegant and extensible solutions at scale using modern web frameworks and technologies.
• Collaborate closely with other Software Engineers and advocate for standards‑driven technology.

• Bachelor’s degree from an accredited university.
• 5+ years of production development experience with C#/.NET (or .NET Core).
• 5+ years of production development experience with Type Script and a modern framework (Vue, React, or Angular).
• Track record of building and launching successful products and platforms.
• Deliver products that meet specifications and performance SLAs.
• Experience with unit, performance, and automation testing.
• Deep understanding of the business drivers behind the software you build.
• Active mentoring of developers and ability to build consensus.

• Experience with relational database design (MS SQL or MySQL) and performance tuning.
• Experience with Datadog, AWS Dynamo
  
  DB, S3, SQS, Elasti Cache, and Apache Kafka.

• Base salary range: $124,000–$187,000, plus performance‑based incentives.
• Comprehensive benefits package: medical, vision, dental, prescription, life, disability, legal, and supplemental insurance.
• 401(k) retirement plan with matching contributions.
• Employee stock purchase plan.
• Paid time off and commuter/parking benefits.
• On‑site fitness center or reimbursed membership, yoga studio, Peloton, and group exercise classes.
• Tuition reimbursement and internal training.
• Virtual and in‑person mental health counseling services.
• Diversity, Equity & Inclusion employee resource groups.
• Complimentary coffee, tea, hot chocolate, fresh fruit, and healthy snacks.

Eligible to work full‑time in the United States; no visa sponsorship available.

Preferred location:
Irvine, CA (4‑day onsite Monday‑Thursday, flexible Fridays remote).

CoStar Group is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment regardless of race, color, religion, gender, sexual orientation, national origin, disability, veteran status, or any other protected characteristic. We maintain a drug‑free workplace and perform pre‑employment substance abuse testing.