Senior Software Engineer – C#/.NET, AWS & AI Tools

CoStar Group; Town of Florida (NY); On-site; USD 118,000 - 154,000; Full time

Benefits offered by this job

Healthcare coverage

401(k) retirement plan

Tuition reimbursement

On-site fitness facilities

Job summary

CoStar Group is seeking a Senior Software Engineer for LoopNet in Irvine, CA. The role focuses on C#/.NET, AWS, and AI-driven development to deliver scalable backend services across LoopNet and related brands.

You will participate in architecture decisions, build robust APIs, and mentor engineers to improve code quality and delivery speeds. The position is onsite with some remote flexibility.

Qualifications

• Bachelor’s degree from an accredited university.
• 4+ years of production development with C#/.NET.
• Proven track record building and launching products.
• Experience delivering products meeting specs and SLAs.
• Experience writing unit and automated tests.
• Strong backend/API design knowledge.
• Mentoring and team collaboration experience.

Responsibilities

• Build scalable systems across multiple products and brands.
• Contribute to architecture decisions and best practices.
• Mentor engineers and promote code quality and reliability.

Skills

C# / .NET

AWS

AI coding tools

APIs & Backend

Testing & QA

Mentoring

Education

Bachelor’s degree

Tools

Vue.js

React (TypeScript)

MS SQL

MySQL

Docker

Kubernetes

Apache Kafka

Datadog

BigQuery

Databricks

Snowflake

Job description

CoStar Group is seeking a Senior Software Engineer for LoopNet in Irvine, CA. The role focuses on C#/.NET, AWS, and AI-driven development to deliver scalable backend services across LoopNet and related brands.

You will participate in architecture decisions, build robust APIs, and mentor engineers to improve code quality and delivery speeds. The position is onsite with some remote flexibility.