Full Time Posted 12 days ago
Senior Software Engineer in Test (SDET)

Job Description


CoStar Group is the world’s leading provider of information and marketing solutions for the Commercial Real Estate industry. We are a NASDAQ listed company with a market cap of over US$30B and sit alongside other notable names such as Amazon, Facebook, Google, and Apple.

As a technology company, we are the trusted partner for all commercial real estate professionals empowering many of the most well-respected landlords, development companies, brokerage firms, banks, lenders, investors, and government agencies.

We do this by actively researching the commercial real estate markets and providing data, analytics, innovative tools and powerful marketing platforms in the U.S. and Internationally to help our clients transact with one another. CoStar continues to win multiple awards including one of Forbes most innovative companies (2017) and Fortune’s fastest growing companies (2018).

LoopNet.com is the leading and most heavily trafficked online commercial real estate (CRE) marketplace listing website in U.S., with over 10 million monthly unique visitors, 70 million monthly property searches and 1 million Detail Page views per day.  A CoStar Group subsidiary, LoopNet marketplace includes LoopNet.com, Ten-X.com, CityFeet.com, Showcase.com, Realla.co.uk and bellbex.com


Job Description 

Are you passionate about software? Are you constantly pushing yourself to learn new technologies to develop better, faster and more efficient applications? Then CoStar is the place for you. Everyone at CoStar is deeply committed to delivering high-performing applications that change the way our users consume and use commercial real estate data. We are THE leading data provider to the $11 trillion commercial real estate industry. Every day customers use our data and products to make multi-million-dollar investment decisions. Our team in Ontario/Irvine, CA is growing rapidly and searching for a Software Engineer in Test who can take us to the next level. Are you up for the challenge? 

The Senior Software Engineer in Test is responsible for designing and developing automated test systems to validate data integrity, functionality, performance, and stability of CoStar’s enterprise class products. The ideal candidate will work with our development team building and implementing software solutions, while owning the testing responsibilities of the projects. CoStar provides a great working environment where engineers have the opportunity to grow while working with the latest technologies. 

Duties and Responsibilities: 

  • The successful candidate will have significant automation test experience in large-scale distributed systems, as well as excellent interpersonal and communication skills required to partner with product development teams, system architects, and stakeholders across the business 

Qualification Requirements:  

  • BS degree in information systems, computer science, or related field. 
  • 5+ years industry experience as a software quality engineer (QA, SDET, etc.) 
  • 3+ years of experience designing, implementing, and executing automated tests 
  • Experienced in UI test automation for high availability web applications leveraging tools such as Selenium, Playwright, Cypress 
  • Experience with writing automated tests for RESTful web services in a large-scale distributed system 
  • Experience building test frameworks using tools like MSTest, NUnit, SpecFlow or similar 
  • Demonstrated experience in test framework design, development and implementation. 
  • Strong object-oriented design and coding skills (preferably C# with .Net Core) 
  • Experience implementing UI test automation infrastructure with containers 
  • Ability to effectively articulate technical challenges and solutions 
  • Familiarity with version control, bug tracking, and CI / CD/CT configurations and procedures  
  • Experience with relational databases and fluent in writing complex SQL queries 
  • An understanding of quality assurance test methodologies in Agile environment, deliverables, processes, strategies, techniques and the software development life cycle (SDLC) is critical. 
  • Experience reporting, regressing and reproducing software problems 
  • Excellent communication, collaboration, reporting, analytical and problem-solving skills 
  • Ability to prioritize and multi-task 

One or more of the following are highly desirable: 

  • Knowledge of coding environments such as NodeJS a plus 
  • Knowledge of JavaScript/Typescript and Jest for unit testing a plus 
  • Hands-on experience with Linux OS and Kubernetes/Docker a plus 
  • Experience with network protocols preferred 
  • Familiarity with and mobile applications (iOS and Android) preferred. 
  • Understanding and experience with Nonfunctional testing and tools (performance testing) is a plus 


Working at CoStar Group means you'll enjoy a culture of collaboration and innovation that attracts the best and brightest across a broad range of disciplines. In addition to generous compensation and performance-based incentives, you'll be supported in both your professional and academic growth with internal training, tuition reimbursement, and an inter-office exchange program.

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

  • Comprehensive healthcare coverage: Medical / Vision / Dental / Prescription Drug
  • Life, legal, and supplementary insurance
  • 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, as well as Segways and bikes available for use during the day
  • Complimentary gourmet coffee, tea, hot chocolate, prepared foods, fresh fruit, and other healthy snacks

Be part of a team of professionals enjoying the opportunity to learn, do, and grow in a rewarding atmosphere. But don't just take our word for it -- see why our team chose to work at and stay at CoStar Group: https://www.youtube.com/watch?v=CVbJRnJ2sX0

Candidates must have current US work authorization

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


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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Senior Software Engineer in Test (SDET)