LoopNet - Senior Software Engineer

Loop Net – Senior Software Engineer

CoStar Group is a leading global provider of commercial and residential real‑estate information, analytics, and online marketplaces. We digitize the industry by delivering insights, products, and services that empower customers, employees, and investors. Loop Net, our flagship marketplace, connects brokers, buyers, and sellers worldwide.

We are seeking a highly skilled Senior Software Engineer with deep expertise in C#/.NET, AWS cloud development, and AI coding tools such as Claude Code or Git Hub Copilot. In this role you will help build scalable, high‑quality systems across our products—including —while leveraging modern AI‑driven development practices to accelerate delivery and improve code quality. You will also play a key role in architecture decisions and in mentoring engineers across the team.

• Design, develop, test, and deploy new features and services in a cloud‑native environment.
• Lead architectural decisions for backend systems and API design.
• Mentor and coach junior and mid‑level engineers.
• Collaborate with cross‑functional teams to deliver high‑value solutions that meet business requirements.

• Bachelor’s degree from an accredited university or college.
• 7+ years of production development experience with C# and .NET or .NET Core.
• Proven history of building and launching successful products and platforms.
• Experience delivering products that meet specifications and performance SLAs.
• Solid experience writing unit, performance, and automated end‑to‑end tests.
• Strong experience building APIs and backend systems with a solid grasp of software design principles.
• Deep understanding of the business context for which you are building software.
• Active participation in mentoring developers and building team consensus.

• Working knowledge of Vue.js or React in Type Script.
• Experience with relational database design (MS SQL or MySQL), including performance tuning.
• Hands‑on experience with AWS services including S3, SQS, DynamoDB, and Elasti Cache, as well as Apache Kafka and Datadog.
• Experience with microservices, distributed systems, Docker, and Kubernetes.
• Familiarity with CI/CD pipelines, Dev Ops practices, and Infrastructure as Code tools.
• Application security knowledge and experience with Git‑based workflows.
• Hands‑on professional experience with AI coding tools such as Claude Code, Git Hub Copilot, or equivalent.
• Experience with cloud data warehouse platforms (Big Query, Databricks, or Snowflake) and proficiency in Python for data engineering or analytics workflows.

• Generous base salary range of $124,000–$187,000 plus performance 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/or reimbursed fitness center membership.
• Access to employee resource groups.
• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and healthy snacks.

Location:

Irvine, CA. Work arrangement: 4 days a week onsite with 1 day work from home.

We welcome all qualified candidates who are currently eligible to work full‑time in the United States. CoStar Group does not provide visa sponsorship for this position.

CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug‑free workplace and conduct pre‑employment substance abuse testing. We comply with all fair employment practices regarding citizenship and immigration status. 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. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation.