Senior Software Engineer (C#/.NET)

CoStar Group

Confirmed live 2 days ago High trust

Quick summary

Work type: On-site
Location: Arlington, VA
Salary: $143,000–$187,000 / yr
Posted: 62 days ago
Freshness: Confirmed live 2 days ago
Nearby: 99+ roles within 25 mi

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Salary context

Competitive pay

How this pay compares to similar roles

Similar $171k

This role $165k

$106k most similar roles pay here $248k

This role pays less than 63% of similar roles. Most pay $149,500–$191,875 — the shaded band above. At the midpoint, this role pays about $165k versus about $171k for comparable roles.

Based on 240 similar postings.

Employer

About CoStar Group

CoStar Group is the leading provider of commercial real estate information, analytics, and online marketplaces, including CoStar, Apartments.com, and LoopNet platforms. Industry: Commercial Real Estate Data & Analytics

CoStar Group currently has 65 open roles on FindRole.

Listed pay typically runs $133,000–$190,000 across 63 roles with salary data.

Most-posted roles

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At a glance

TL;DR · Senior Software Engineer (C#/.NET)

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As a Senior Software Engineer on the Platform Development team, you will play a critical role in expanding the data platform supporting major real estate brands. You will build large, distributed, API-driven systems for thousands of users while designing and implementing AI-powered software solutions to enhance customer experience and platform intelligence. Your daily work involves building intelligent workflows, integrating AI agents into internal systems, and developing telemetry-driven solutions to improve system reliability and observability. The role requires expertise in C#, .NET Framework, SQL Server, and AWS, including specific familiarity with Lambda, DynamoDB, and SQS. You will also utilize LLMs, prompt engineering, and agent-based architectures to automate research workflows and improve data quality. This position focuses on solving complex technical challenges within the real estate information and online marketplace domain through innovative software engineering.

What does a Software Engineer earn in Virginia?

Median $211200 from 265 postings across 15 companies.

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Skills

C# .NET SQL Server AWS Azure Web API ASP.NET MVC RESTful Web Services LLMs Prompt Engineering DynamoDB SQS Lambda Data Modeling Agile Telemetry Observability

What you'll do

Build large-scale, distributed, API-driven systems using C#, .NET Framework, SQL Server, and AWS.
Design and implement AI-powered software solutions to enhance customer experience and platform intelligence.
Integrate AI agents, tools, and intelligent workflows into internal systems and customer-facing applications.
Develop telemetry-driven solutions to proactively identify system anomalies and performance bottlenecks.
Utilize AI models to improve monitoring, observability, and diagnostic capabilities for better system reliability.
Create automated solutions to streamline research workflows and increase operational efficiency across business functions.
Lead software design, establish development standards, and conduct code reviews.
Evaluate emerging technologies to identify best practices for the company's technology platform.

What we're looking for

Bachelor's Degree from an accredited, in-person university or college.
5+ years of deep .NET development (C#) experience including cross-platform communication technologies like Web API.
Experience with cloud-based platforms such as AWS or Azure.
Experience with RESTful web services and ASP.NET MVC.
Experience architecting, designing, and building large-scale distributed, service-oriented systems in an agile environment.
Data modeling experience including conceptual, logical, and physical designs.
Familiarity with large language models (LLMs), prompt engineering, or agent-based architectures.
Experience with monitoring, telemetry, observability, or automated diagnostics platforms.

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