Jobs in the United States

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Added 1 min ago
Product Manager
Meta
Honolulu, HI
Integrate data, usability studies, research, and market analysis into product strategies and requirements to enhance user satisfaction and improve engineer productivity
Added 1 min ago
VDC (BIM) Engineer
PCL Construction
Honolulu, HI
As an VDC (BIM) Engineer for Nordic PCL Construction, Inc. in Honolulu, Hawaii, you’ll have the opportunity to coordinate digital construction tools, project data, and field operations to…
Added 1 min ago
Senior Business Intelligence Professional
CenterWell
Honolulu, HI
The Senior Business Intelligence Engineer solves complex business problems and issues using data from internal and external sources to provide insight to decision-makers. The Senior…
Added 1 min ago
EG
Knowledge Graph Architect
Eliassen Group
Honolulu, HI
- $100 to $120 USD / hour
…platform. You will connect historical project and operational data across estimating, scheduling, project controls, field execution, equipment, cost, and lessons learned to create a…
Added 8 mins ago
Product Manager
Meta
Cheyenne, WY
Integrate data, usability studies, research, and market analysis into product strategies and requirements to enhance user satisfaction and improve engineer productivity
Added 8 mins ago
O
Lead Principal Software Development Engineer
Oracle
Cheyenne, WY
- $135,200 to $306,400 USD / year
As a Sr. Principal Software Development Engineer in the Oracle Cloud Infrastructure (OCI) Core Platform division, you will play a critical leadership role in the architecture, evolution,…
Added 8 mins ago
Senior Staff Software Engineer, Institutional Exchange
Coinbase
Cheyenne, WY
…markets with speed, depth, and trust. As a Senior Staff Software Engineer on the Exchange team, you'll set the architectural direction for the matching engine, order management, market…
Added 8 mins ago
Principal Software Engineer
Highmark Health
Cheyenne, WY
We are seeking a visionary Principal Software Engineer responsible for building scalable public-facing software applications across Digital Member Experience channels. As a key player…
Added 8 mins ago
Senior Business Intelligence Professional
CenterWell
Cheyenne, WY
The Senior Business Intelligence Engineer solves complex business problems and issues using data from internal and external sources to provide insight to decision-makers. The Senior…
Added 8 mins ago
Senior Technical IT Storage Engineer
Highmark Health
Cheyenne, WY
Assisting in data backup and recovery management along with both disaster recovery and cyber recovery testing and activities.
Added 8 mins ago
Site Reliability Engineer
Highmark Health
Cheyenne, WY
Added 8 mins ago
EG
Knowledge Graph Architect
Eliassen Group
Cheyenne, WY
- $100 to $120 USD / hour
…platform. You will connect historical project and operational data across estimating, scheduling, project controls, field execution, equipment, cost, and lessons learned to create a…
Added 9 mins ago
TT
Software Engineer, Distributed Systems (Core)
True Talent Solutions Partners
Remote, United States
- $180,000 to $320,000 USD / year
Join the core engineering team building and scaling distributed systems for a data activation platform. You will improve the systems that move large volumes of customer data, working across…
Added 16 mins ago
Systems Engineer RF Integration & Performance Modeling
BAE Systems
Nashua, NH
Our ACES team is seeking a highly motivated systems engineer to support the development of new Electronic Attack (EA) capabilities designed to improve air vehicle survivability by…
Added 16 mins ago
EG
Knowledge Graph Architect
Eliassen Group
Concord, NH
- $100 to $120 USD / hour
…platform. You will connect historical project and operational data across estimating, scheduling, project controls, field execution, equipment, cost, and lessons learned to create a…
Added 20 mins ago
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Staff Software Engineer (Backend, Business Systems)
Whoop
Boston, MA
- $170,000 to $230,000 USD / year
WHOOP is hiring a Staff Software Engineer to join the Business Systems team. In this role, you will play a crucial role in architecting, developing, and optimizing the backend…
Added 58 mins ago
Lead Software Engineer
Chicago, IL · Peoria, IL · Irving, TX
…million connected assets worldwide, we're focused on using data, advanced analytics, and AI capabilities to help our customers build a better…
Added 1 hour ago
Data Platform Engineer
Domino's
Ann Arbor, MI
Domino’s continues its journey towards the dominant #1 Pizza Company in the world and sound data is the most fundamental of assets that helps us drive towards that. To help accelerate our…
Added 1 hour ago
TT
Lead Platform Engineer
True Talent Solutions Partners
San Francisco, CA
- $220,000 to $300,000 USD / year
As the senior engineering anchor for a data infrastructure and analytics platform, you will lead the architecture and operation of systems that turn diverse scientific data into a reliable,…
Added 1 hour ago
TT
Product Engineer, Scrape
True Talent Solutions Partners
San Francisco, CA
- $235,000 to $260,000 USD / year
…that turn changing, difficult-to-access web content into clean data for AI applications. You will own features from early discovery through production, with a focus on reliable APIs and a…
Added 1 hour ago
TT
Senior Security Engineer
True Talent Solutions Partners
San Francisco, CA
- $190,000 to $250,000 USD / year
Added 1 hour ago
TI
Engineering Manager, Production Engineering
Tutor Intelligence
Watertown, MA
- $175,000 to $225,000 USD / year
Recurring failures: Use data from the line and the field to drive recurring problems to root cause and permanent fixes.
Added 1 hour ago
TT
Senior/Staff Product Engineer, Applied AI and Agents
True Talent Solutions Partners
San Francisco, CA
- $200,000 to $300,000 USD / year
- Improve system performance, reliability, and scalability across APIs, data models, and distributed services.
Added 1 hour ago
TT
Backend Infrastructure Engineer, Anti-Bot
True Talent Solutions Partners
San Francisco, CA
- $235,000 to $260,000 USD / year
Join a team building the infrastructure behind a web data extraction platform for AI applications. You will own production systems that keep extraction fast and reliable against websites…
Added 1 hour ago
TT
Software Engineer, C++ Systems
True Talent Solutions Partners
San Francisco, CA
- $250,000 to $325,000 USD / year
- Background in areas such as compilers, networking protocols, kernels, Kubernetes, infrastructure, distributed systems, storage, or data ingestion is valuable.

Closed listing

CoStar

Software Engineer I (C#/.NET)

Arlington, United States

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

This opening has closed.

The original listing is kept below for reference.

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Job details

Pay: $108,000 to $154,000 USD / year
Closing date: 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

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Original job description

Archived listing. The details below describe a past opening.

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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