Jobs in the United States

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Added 1 min ago
VLSI Physical Design Engineer
HPE
Ft. Collins, CO
…architecture and logic design, design verification through software developed for component and system simulation, and builds physical implementations through development of…
Added 1 min ago
VLSI Physical Design Engineer
HPE
Ft. Collins, CO
…architecture and logic design, design verification through software developed for component and system simulation, and builds physical implementations through development of…
Added 2 mins ago
AI Native Software Engineer - Digital Core - Americas Market
Accenture LLP Company
NY
An engineer who builds across the stack: front end, APIs, services, data, and the infrastructure it runs on. You take ownership of a feature through to production, including the parts that…
Added 4 mins ago
CO
Senior Civil Engineer
City of Emeryville
Emeryville, CA
- $84.32 to $102.47 USD / hour
…principles of algebra, geometry and trigonometry and their application to engineering; title and record search procedures; the operation of a municipal Public Works Department's function;…
Added 5 mins ago
KC
SW Algorithm Engineer
KLA Corporation
Milpitas, CA
- $136,300 to $231,700 USD / year
Take ownership of algorithm development from concept and prototyping to production deployment
Added 6 mins ago
Technical Program Manager, Flight Software
K2 Space
Los Angeles, CA
You will work day-to-day with software engineering leads to build and maintain the development schedule, track dependencies against hardware and test milestones, and surface risks and…
Added 6 mins ago
Middleware Engineer
ASM Research, An Accenture Federal Services Company
Providence, RI
The Middleware Engineer, Junior assists in provisioning, configuring, and administering middleware platforms that connect applications and databases in complex enterprise environments. This…
Added 6 mins ago
Lead Software Engineer - NBA
Humana
Providence, RI
The Lead Full Stack Engineer owns the NBA platform's orchestration and state machine - the system that carries a decision from the moment it is made to the moment it is activated,…
Added 6 mins ago
Warehouse Lead Industrial Engineer - Ryder Last Mile (remote)
Ryder System
Providence, RI
…improvement methods to support new and existing operations. The Lead Engineer will identify, lead and drive change within the operation through data driven CI, Engineering, and Automation…
Added 6 mins ago
Site Reliability Engineer
Highmark Health
Remote, United States
…standards of care and operational efficiency. This role blends software engineering, clinical engineering, and security principles with a deep understanding of healthcare operations to…
Added 6 mins ago
Vice President, Digital Engineering Health100
CVS Health
Remote, United States
15+ years of experience in digital software development and engineering
Added 6 mins ago
CrowdStrike Platform Resident Consultant (Remote)
CrowdStrike
Providence, RI
Utilize and engineer native and 3rd party software deployment technologies
Added 6 mins ago
AI & Distributed Systems Backend Engineer - Senior - Consulting - Location OPEN
EY
Providence, RI
Proficiency in application development tools and quality assurance practices.
Added 6 mins ago
Sr. Software Engineer, MarTech (Remote)
CrowdStrike
Providence, RI
CrowdStrike is looking for a Sr. Software Engineer - MarTech to join our fast-growing Marketing IT team. You will apply AI to transform how Marketing and Sales work, building LLM-based…
Added 6 mins ago
Senior Software Engineer - Application Development
Zayo
Providence, RI
We’re looking for a talented Senior Software Engineer, Application Development to join our growing team. In this role, you’ll help design, build, deploy, and support software services that…
Added 6 mins ago
PN
Software Engineer 1
Pacific Northwest National Laboratory
Providence, RI
- $83,100 USD / year
This Software Engineer 1 role will support the development of the EMSL Science Central technology platform with a focus on backend services, data infrastructure, and platform reliability.…
Added 6 mins ago
Staff Engineer - OMS SRE
CVS Health
Woonsocket, RI
Partner with application development, architecture, platform engineering, infrastructure, and business stakeholders to support modernization efforts.
Added 6 mins ago
C
Frontier Engineer (AI/Agentic)
Cognizant
Providence, RI
- $100,000 USD / year
Frontier Engineers combine modern software engineering, cloud development, and AI technologies to build scalable digital solutions. Successful candidates typically demonstrate strength in…
Added 6 mins ago
C
Senior Quality Engineering Automation Engineer
Cognizant
Providence, RI
- $53,477 to $92,500 USD / year
As a Senior Quality Engineering Automation Engineer, you will make an impact by designing and maintaining scalable automated testing solutions for web-based applications. You will be a…
Added 7 mins ago
C
SDET / QA Automation Engineer – Playwright, Selenium, Java & Functional Testing
Cognizant
Providence, RI
- $53,000 to $92,500 USD / year
We are seeking a highly skilled SDET / QA Automation Engineer – Playwright, Selenium, Java & Functional Testing to join our Quality Engineering team supporting enterprise healthcare…
Added 7 mins ago
Software Engineer
Eliassen Group
Smithfield, RI
Our client seeks a Software Engineer with recent Angular and TypeScript experience to lead development efforts and apply prompt engineering practices with AI-assisted tooling. The role…
Added 7 mins ago
Staff Software Engineer AI, Platform
Airbnb
United States
…platform that accelerates the pace of Machine Learning design & development and the deployment of impactful, high-quality ML use cases company-wide. You’ll also join us in creating the…
Added 8 mins ago
Knowledge Manager
Booz Allen Hamilton_United States
Washington, DC · McLean, VA
As a content management engineer at Booz Allen, you’ll lead the complex design and development of both “out of the box” and module or plugin development frameworks. With the support of your…
Added 8 mins ago
Data Platform Engineer, Senior
Booz Allen Hamilton_United States
Alexandria, VA · St. Louis, MO
Everyone is trying to “harness the cloud”, but not everyone knows how. As a DevOps engineer, you’re eager to develop, manage, and secure a container platform that meets your client’s needs…
Added 8 mins ago
AIOps Engineer
Booz Allen Hamilton_United States
Alexandria, VA · St. Louis, MO
…operations for national security requirements. As a DevOps engineer, you know how to create efficient and effective solutions, so you can quickly deliver the best operational data. Booz…

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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