Senior Software Engineer – AI-Driven .NET on AWS (Hybrid)

LoopNet; Irvine (CA); Hybrid; USD 124,000 - 187,000; Full time

Benefits offered by this job

Healthcare coverage

401(k) matching

Tuition reimbursement

On-site fitness center

Job summary

CoStar Group, located in Irvine, CA, is seeking a Senior Software Engineer with deep C#/.NET and AWS cloud development experience. The role focuses on scalable backend systems across LoopNet.com and other brands, with mentoring responsibilities and involvement in architecture decisions.

Preferred skills include React/TypeScript, AWS services, Docker/Kubernetes, CI/CD, and AI tooling. The position offers hybrid onsite work, comprehensive benefits, and competitive salary.

Qualifications

• Bachelor’s degree from an accredited, not-for-profit university or college.
• 6+ 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.

Responsibilities

• Contribute to building scalable, high‑quality systems across multiple products and brands including LoopNet.com.
• Mentor engineers across the team and participate in architecture decisions.
• Drive delivery using AI-driven development practices to accelerate delivery and improve code quality.

Skills

C#/.NET

APIs

Unit tests

Mentoring

Education

Bachelor's degree

Tools

Docker

Kubernetes

Datadog

Apache Kafka

Job description

CoStar Group, located in Irvine, CA, is seeking a Senior Software Engineer with deep C#/.NET and AWS cloud development experience. The role focuses on scalable backend systems across LoopNet.com and other brands, with mentoring responsibilities and involvement in architecture decisions.

Preferred skills include React/TypeScript, AWS services, Docker/Kubernetes, CI/CD, and AI tooling. The position offers hybrid onsite work, comprehensive benefits, and competitive salary.