Senior Full-Stack Engineer, AI-Driven Web Platform

CoStar Group, Inc.; Irvine (CA); On-site; USD 124,000 - 187,000; Full time

Benefits offered by this job

Healthcare

401(k) matching

Stock purchase plan

Tuition reimbursement

On-site fitness center

Job summary

CoStar Group is seeking a Senior Software Engineer to join LoopNet and support multiple products such as LoopNet.com. This role is based in Irvine, CA with 4 days onsite and 1 day remote, impacting a high-traffic web platform used by millions of users.

You will design and implement robust software, work with modern front-end frameworks, and work within agile teams. You will leverage C#/.NET, TS-based front-ends (Vue/React/Angular), and AWS services, contributing to architectural decisions,

Qualifications

• Bachelor’s Degree required.
• 7+ years of production development experience with C# .Net (or .Net Core).
• Working knowledge Vue, React or Angular in TypeScript.
• Experience with AWS S3, SQS, Dynamo, ElastiCache, Apache Kafka and Datadog.
• Leverage AI Coding Tools for development, refactoring, and debugging (Claude Code, GitHub Copilot or equivalent).
• Proven track record of building and launching successful products and platforms.

Responsibilities

• Design and develop using Object Oriented design principles and software design patterns to attain high reusability and maintainability.
• Deep knowledge and experience in writing 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.

Skills

C#/.NET

JS frameworks

AWS

AI coding tools

SQL/DB

Agile/Scrum

Unit testing

Education

Bachelor’s Degree

Tools

MS SQL

MySQL

Git

Job description

CoStar Group is seeking a Senior Software Engineer to join LoopNet and support multiple products such as LoopNet.com. This role is based in Irvine, CA with 4 days onsite and 1 day remote, impacting a high-traffic web platform used by millions of users.

You will design and implement robust software, work with modern front-end frameworks, and work within agile teams. You will leverage C#/.NET, TS-based front-ends (Vue/React/Angular), and AWS services, contributing to architectural decisions,