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Added 15 mins ago
Software Engineer (Hybrid)
Cisco Systems, Inc.
San Jose, CA · RTP, NC
Added 21 mins ago
O
Lead Principal Platform Software Engineer
Oracle
United States
- $113,600 to $306,400 USD / year
…product strategy for Oracle Health, while building out a complete platform supporting modernized, automated healthcare. This is a net new line of business, constructed with an…
Added 28 mins ago
Sr. Software Development Engineer, AWS Quick
Amazon
Bellevue, WA
…how to get it done. We are looking for a Software Development Engineer III to design and deliver the third-party integrations that connect Quick to the business systems users rely on every…
Added 28 mins ago
MC
Software Engineer II - Remote Desktop Protocol & Redirection
Microsoft Corporation
Redmond, WA
- $102,100 to $219,200 USD / year
Partner with Windows platform, security, device, and other engineering teams to design robust and secure implementations.
Added 1 hour ago
Senior Software Engineer, Biggy Engineering
BigPanda
Remote, United States
As a Software Engineer on Biggy Engineering, you will design, build, and ship AI-powered product capabilities across the Biggy platform. You will own meaningful features end to end:…
Added 1 hour ago
H
Software Systems Engineer - GitHub Enterprise
HP
Vancouver, WA
- $105,050 to $161,800 USD / year
…operated at global scale. Our team delivers a modern cloud platform powering hundreds of services, enabling developers to move faster through standardized tooling, CI/CD pipelines, and…
Added 2 hours ago
Software Engineer Application Framework
Octus
NEW YORK, NY
Added 2 hours ago
Staff Software Engineer, Data & Scalability Platform
Cisco
New York, NY
As a Staff Software Engineer on the Data & Scalability Platform team, you will provide technical leadership for the architecture, scalability, and cost of the entire data plane: the stores…
Added 2 hours ago
Vice President, Senior Backend Engineer (Java) - Aladdin Engineering
BlackRock
New York, NY
Senior Engineer – Back e nd (Java) – V ice President
Added 2 hours ago
AE
Sr Software Engineer II
American Express
New York, NY
- $123,000 to $215,250 USD / year
This is a hands-on senior engineering role at the intersection of Salesforce, Google Cloud Platform (GCP), data engineering, APIs, distributed systems, and data security. The engineer will…
Added 2 hours ago
Staff Data Engineer Slack
Salesforce.com
NEW YORK, NY
…to the right metric definitions and tables. As a Staff Data Engineer, you set the technical direction for how Slack defines, computes, governs, and serves its most critical metrics, and you…
Added 2 hours ago
Digital Asset QA Engineer
Innova Solutions Inc
NEW YORK, NY
Added 2 hours ago
Senior Software Engineer Technical Remediation & Enablement
Citigroup
New York, NY
The Vice President (VP) / Senior Software Engineer – Technical Remediation & Enablement Lead is a hands-on, code-level technical specialist responsible for driving the direct remediation of…
Added 2 hours ago
DE
Engineer, Quant Systems
D. E. Shaw and Co., L.P.
NEW YORK, NY
- $200,000 to $260,000 USD / year
Added 2 hours ago
Principal Software Engineer, Site Reliability (Agentforce Ops)
Salesforce.com
NEW YORK, NY
…transition. What You'll Actually Be DoingAs a Production Support Engineer (PMTS), you will be a senior technical member of staff within our embedded reliability team. You aren't building…
Added 2 hours ago
Senior Software Engineer, Site Reliability (Agentforce Ops)
Salesforce.com
NEW YORK, NY
…transition. What You'll Actually Be DoingAs a Production Support Engineer (SMTS), you will be a senior technical member of staff within our embedded reliability team. You aren't building…
Added 2 hours ago
Inside Solutions Architect Services & Tools Engineer
Presidio Networked Solutions, LLC
NEW YORK, NY
…helping configure, support, and continuously improve the XaitCPQ platform and the related presales workflows used to create Professional Services scopes, pricing documents, Project Change…
Added 2 hours ago
CCSI Systems Lead Engineer
AlixPartners
NEW YORK, NY
…across Azure and multi-cloud environments.The CCSI Systems Lead Engineer is a full-time role located in Southfield, MI, Chicago, IL, Dallas/Houston, TX, or New York, NY and reports to the…
Added 3 hours ago
Staff Software Engineer, AI Solutions
Visa USA Inc
Denver, CO
…optimizing AI-powered solutions integrated into the ServiceNow platform. Your primary focus will be on leveraging artificial intelligence, including custom MCP tooling, Agentic scoped…
Added 4 hours ago
ADAS Engineer
V2soft Inc.
Ann Arbor, MI
Added 5 hours ago
Senior Software Engineer
Dekker
Albuquerque, NM
Dekker is looking for experienced software engineers to join our growing team. A Senior Software Engineer designs, builds, and supports the applications, data pipelines, and AI-enabled…
Added 7 hours ago
IC
AI Silicon Performance Modeling and Analysis Engineer
Intel Corporation
CA
- $141,910 to $232,190 USD / year
We are seeking a highly experienced and motivated engineer to drive AI silicon performance modeling, validation, architectural analysis, and stakeholder engagement activities. The candidate…
Added 8 hours ago
Software Engineer, Platform Infrastructure
Axiom
South San Francisco, CA
Build the secure, reliable platform that powers Axiom’s scientific AI agents, experimental data pipelines, and products used by the largest pharmaceutical companies and AI labs in the world.
Added 9 hours ago
EG
Knowledge Graph Architect
Eliassen Group
Pierre, SD
- $100 to $120 USD / hour
…construction-focused ontology, knowledge graph, and AI knowledge platform. You will connect historical project and operational data across estimating, scheduling, project controls, field…
Added 9 hours ago
Data Engineer, Scientific Data
Axiom
South San Francisco, CA
…cause of drug failure. Our high-throughput human liver safety platform combines advanced human cell systems with imaging, transcriptomics, mass spectrometry, and drug metabolism…

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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