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Design and develop highly reusable and maintainable software using Object Oriented principles and C#. Drive continuous improvement within Agile teams and evaluate emerging technologies to strengthen the technology platform.
Requires a Bachelor's degree and over 9 years of production development experience with C# .Net. Candidates must be proficient in modern frontend frameworks, AWS services, and AI coding tools.
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Job Description
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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 and the NASDAQ 100, 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.
LoopNet, the most popular place to find a space, is the #1 global commercial real estate marketplace. With more than 12 million global unique monthly visitors, LoopNet provides brokers, buyers and sellers with what they need to meet and make deals. LoopNet has established itself as the most effective and far-reaching digital marketplace for commercial real estate owners and brokers. We are not done yet! We continue to focus on driving expansion by increasing market share in the US and abroad, continuously innovating and enhancing the product and growing a powerhouse global team to reach our goals. Learn more about LoopNet.
Our team is seeking an accomplished Lead Software Engineer to join our team in supporting multiple software products and brands across the organization, such as www.LoopNet.com. You will have a direct impact on highly visible web applications that touch more than 10,000,000 users. You continuously learn emerging technologies and architecture advancements and apply the learnings to improve LoopNet’s software products.
This position is located in Irvine, CA and offers 4 days a week onsite with 1 day work from home.
Design and develop using Object Oriented design principles and software design patterns to attain high reusability and maintainability.
Deep knowledge and experience in writing unit testable software with C#
Develop an in-depth understanding of CoStar’s product architecture and frameworks. Maintain and contribute to CoStar’s product platform as necessary.
Develop database stored procedures and SQL scripts/ETL jobs that meet CoStar database standards to implement product requirements.
Participate and drive continuous improvement within CoStar’s Agile/Scrum teams.
Build consensus among different teams working on software development projects.
Facilitate discussions among other .NET and database developers to exchange new ideas and improvements.
Continually evaluate emerging technologies to identify opportunities, trends and best practices that can be used to strengthen CoStar’s technology platform and development practices.
Bachelor’s Degree required from an accredited, not-for-profit university or college.
A track record of commitment to prior employers.
Working knowledge Vue, React or Angular in TypeScript
Experience with AWS S3, SQS, Dynamo, ElastiCache, Apache Kafka and Datadog
Leverage AI Coding Tools for development, refactoring, and debugging (Claude Code, GitHub Copilot or equivalent).
9+ years of production development experience with C# .Net (or .Net Core)
A demonstrable track record of building and launching successful products and platforms
Deliver products that meet specifications and performance SLA
Deeply understand what drives the business for which you are building software
Experience in relational database design (MS SQL or MySQL) including performance tuning
Application security knowledge and experience with Git-based workflows.
Take an active role in mentoring developers with ability to build consensus
Experienced in unit, performance, and automation testing
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), with yoga studio, Pelotons, personal training, group exercise classes
Access to CoStar Group’s Employee Resource Groups
Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks
This position offers a base salary range of $144,000-$222,000, based on relevant skills and experience and includes a generous benefits plan.
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.
#LI-AV1
#LoopNet
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CoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and perform pre-employment substance abuse testing
CoStar Group (NASDAQ: CSGP) is a global leader in commercial real estate information, analytics, online marketplaces, and 3D digital twin technology. Founded in 1986, CoStar Group is dedicated to digitizing the world’s real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives. CoStar Group’s major brands include CoStar, a leading global provider of commercial real estate data, analytics, and news; LoopNet, the most trafficked commercial real estate marketplace; Apartments.com, the leading platform for apartment rentals; Homes.com, the fastest-growing residential real estate marketplace; and Domain, one of Australia’s leading property marketplaces. CoStar Group’s industry-leading brands also include Matterport, a leading spatial data company whose platform turns buildings into data to make every space more valuable and accessible, STR, a global leader in hospitality data and benchmarking; Ten-X, an online platform for commercial real estate auctions and negotiated bids; and OnTheMarket, a leading residential property portal in the United Kingdom. CoStar Group’s websites attracted over 143 million average monthly unique visitors in the third quarter of 2025, serving clients around the world. Headquartered in Arlington, Virginia, CoStar Group is committed to transforming the real estate industry through innovative technology and comprehensive market intelligence. From time to time, we plan to utilize our corporate website as a channel of distribution for material company information. For more information, visit CoStarGroup.com.
Offices: 1201 Wilson Blvd, Arlington, Virginia 22209, US · 181 Bay St, Suite 3420, Toronto, Ontario M5J, CA · 81, Rue Taitbout, Paris, Île-de-France 75009, FR · Calle de Serrano, 47, 13th Floor, Madrid, 28001, ES · 32 London Bridge, 26th Floor, The Shard, London, England SE1 9SG, GB
Based on 324 listings with disclosed salaries, most software jobs in Irvine, CA pay between $97k–$204k per year. Individual offers vary with seniority, company size, and specialization.
There are currently 389 open software positions in Irvine, CA listed on Clera. New openings are added daily as companies post roles.
Companies currently hiring include CoStar Group, Hyundai Capital America, Amazon, FieldAI, mouhamedzz, among others. Browse the listings above to see every active employer.
Yes — 174 of the 389 open software positions offer remote or hybrid work (32 remote, 142 hybrid).
Each listing links directly to the employer's application page. Apply early — fresh listings get the most recruiter attention in the first two weeks.
