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Added 4 mins ago
Supplier Development & Qualification Quality Engineer
Vertiv
Pelzer, SC · Anderson, SC · Westerville, OH
As a Sr. Supplier Quality Engineer in Supplier Development & Qualification, you will scale and optimize Vertiv’s external supplier base in alignment with strategic procurement and quality…
Added 5 mins ago
Technical Support Engineer I
DynatraceLLC
United States
…broader enablement opportunities and areas for your own skill…
Added 14 mins ago
MI
Staff Software Development Engineer
Maxar Intelligence I
Westminster, CO
- $105,000 to $140,000 USD / year
We are seeking aSoftware Engineer with strongAI/MLexperiencetojoin a team thatdevelopsandmaintainsautonomous planning, scheduling,and optimizationsystems foradvancedEarth…
Added 29 mins ago
Hardware Electronics Design Engineer
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The HW Development engineer is expected to be able to...
Added 36 mins ago
Principal I&C Engineer
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Experience with process and control system platforms including modification to the control system hardware and software, communications systems(including wireless), and development and…
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Richland, WA
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Added 36 mins ago
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Amazon
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Amazon
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1+ years of software development engineer or related occupational experience
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Hardware Development Engineer II, Amazon Leo
Amazon
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Software Dev Engineer II, Amazon Leo - Ground Control Services
Amazon
Redmond, WA
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Systems Development Engineer, Amazon Foundational Security Services
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Added 37 mins ago
Naval Architect Engineer - National Capital Region
Serco USA
Arlington, VA · Alexandria, VA · Andrews AFB, MD · Washington, DC · Washington Navy Yard, DC · McLean, VA · Bethesda, MD · Silver Spring, MD · Quantico, VA · Rockville, MD
Serco is seeking an experienced Naval Architect Engineer with specialized expertise in hydrodynamics and ship design to be part of our dynamic Maritime Engineering Operation (MEO) as a…
Added 37 mins ago
Experienced Software Engineer - Colorado Springs, CO
Serco USA
CO · Colorado Springs, CO · Peterson AFB, CO · Loveland, CO
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Added 38 mins ago
Senior Systems Engineer
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Kirtland AFB, NM · Albuquerque, NM · Cannon AFB, NM · Holloman, NM · NM · Socorro, NM
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Added 38 mins ago
Systems Engineer - Project Manager/Task Lead
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Knowledge of software development Lifecyle concepts, Agile methodologies, and DevSecOps practices
Added 50 mins ago
Controls Engineer
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Added 53 mins ago
Sr Engineer - New Business
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BOLINGBROOK, IL
The Senior Engineer provides technical leadership in the planning, design, and execution of projects involving Exelon's utility infrastructure including electric or gas distribution,…
Added 1 hour ago
Cybersecurity Engineer - Washington, D.C.
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Added 1 hour ago
Principal Software Engineer - AI Enabled Product Development
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Dallas, TX
We’re looking for a Principal Software Engineer who combines strong architectural thinking with a genuine passion for hands-on engineering.
Added 1 hour ago
Principal Software Engineer - AI Enabled Product Development
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Sr. Manufacturing Test Engineer, Factory Launch
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Senior Associate, Cyber Forward Deployed Engineer
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Salesforce Developer
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CoStar

Software Engineer I (C#/.NET)

Arlington, United States

$108,000 to $154,000 USD / year

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Job details

Pay: $108,000 to $154,000 USD / year
Apply by: Apr 27, 2027
Education: Bachelor’s degree
Experience: 3+ years of deep .NET development (C#) development experience including cross platform communication technologies such as Web API.
Posting language: English
Posted: Oct 29, 2026

Original job description

Software Engineer I (C#/.NET)

Job Description

Overview

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives.

We have been living and breathing the world of real estate information and online marketplaces for over 35 years, giving us the perspective to create truly unique and valuable offerings to our customers. We’ve continually refined, transformed and perfected our approach to our business, creating a language that has become standard in our industry, for our customers, and even our competitors. We continue that effort today and are always working to improve and drive innovation. This is how we deliver for our customers, our employees, and investors. By equipping the brightest minds with the best resources available, we provide an invaluable edge in real estate.

As a Software Engineer on the Platform Development team, you will play a key role in expanding the data platform that supports all of CoStar Group’s largest brands including CoStar Suite, LoopNet, Homes.com and Apartments.com. You will deeply understand what drives the business for which you are building software. We firmly believe that what separates a good developer from a great one is a deep understanding of the business that they are supporting.

CoStar is investing heavily in artificial intelligence to accelerate software delivery, improve platform observability, automate research and business workflows, enhance product experiences through intelligent agents and skills, and improve data quality across enterprise systems. Successful candidates will demonstrate a willingness to learn, adopt, and apply AI technologies responsibly to solve complex business and engineering challenges.

This position is in Arlington, VA and is in office Monday through Thursday with work from home on Friday.

Responsibilities

Build big, distributed, API-driven systems for tens of thousands of users.
Design and implement AI-powered software solutions that enhance the customer experience, improve platform intelligence, and unlock new product capabilities across CoStar brands.
Build and integrate AI skills, agents, tools, and intelligent workflows into internal systems and customer-facing applications.
Produce bullet-proof code that is robust, efficient, and maintainable; our primary tools are C#, .NET Framework, SQL Server, AWS, Claude Code.
Utilize AI models to enhance monitoring, replayability, observability, and diagnostic capabilities to improve system reliability, accelerate problem resolution, and reduce operational risk.
Implement telemetry-driven solutions that proactively identify anomalies, performance bottlenecks, and potential customer-impacting issues.
Learn software design, development standards, and take part in code reviews.
Build intelligent automation solutions that streamline research workflows, improve information discovery, and increase operational efficiency across business functions.
Continually evaluate emerging technologies to identify opportunities, trends, and best practices that can be leveraged to strengthen CoStar’s technology platform and development practices.

Basic Qualifications

Bachelor’s Degree required from an accredited, not for profit, in person university or college.
A track record of commitment to prior employers.
3+ years of deep .NET development (C#) development experience including cross platform communication technologies such as Web API.
Working knowledge and experience with cloud-based platforms (AWS or Azure).
Experience with RESTful web services.
Experience in architecting, designing, and building distributed, service-oriented systems and web applications in an agile environment.
Data modeling experience.
Familiarity with large language models (LLMs), prompt engineering, or agent-based architectures.
Experience working with monitoring, telemetry, observability, or automated diagnostics platforms.
Strong understanding of data quality principles, data governance concepts, and data-centric application design.

Preferred Qualifications and Skills

Strong communication skills (to both business and technical partners).
SQL and database development knowledge.
Familiarity with AWS PaaS services such as Lambda, DynamoDB, and SQS.
Data modeling experience from conceptual, logical, and physical designs.
Experience implementing AI agents, workflow automation platforms, or intelligent search solutions.
Experience applying AI-assisted software development practices to improve engineering productivity and code quality.

What’s in it for You

When you join CoStar Group, you’ll experience a collaborative and innovative culture working alongside the best and brightest to empower our people and customers to succeed.

We offer you generous compensation and performance-based incentives. CoStar Group also invests in your professional and academic growth with internal training, and tuition reimbursement.

Our benefits package includes (but is not limited to):

Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug
Life, legal, and supplementary insurance
Virtual and in person mental health counseling services for individuals and family
Commuter and parking benefits
401(K) retirement plan with matching contributions
Employee stock purchase plan
Paid time off
Tuition reimbursement
On-site fitness center and/or reimbursed fitness center membership costs (location dependent)
Access to CoStar Group’s Employee Resource Groups
Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks

The final salary or hourly rate offered for this role will fall within the range set forth below based on a variety of factors, including but not limited to, geographic location, skills, and competencies.

Base Compensation: $108,000 - $154,000 Annually

We welcome all qualified candidates who are currently eligible to work full-time in the United States to apply. However, please note that CoStar Group is not able to provide visa sponsorship for this position.

CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing

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