{"schemaVersion":"jobsearcher.job.v1","id":"96eccbc585997c11ac83447f","url":"https://jobsearcher.com/jobs/96eccbc585997c11ac83447f","canonicalUrl":"https://jobsearcher.com/jobs/96eccbc585997c11ac83447f","title":"LoopNet - Senior Software Engineer","description":"LoopNet – Senior Software Engineer\r\nCoStar Group is a leading global provider of commercial and residential real-estate information, analytics, and online marketplaces. We digitize the industry by delivering insights, products, and services that empower customers, employees, and investors. LoopNet, our flagship marketplace, connects brokers, buyers, and sellers worldwide.\r\nWe are seeking a highly skilled Senior Software Engineer with deep expertise in C#/.NET, AWS cloud development, and AI coding tools such as Claude Code or GitHub Copilot. In this role you will help build scalable, high-quality systems across our products—including LoopNet.com—while leveraging modern AI-driven development practices to accelerate delivery and improve code quality. You will also play a key role in architecture decisions and in mentoring engineers across the team.\r\nResponsibilities\r\nDesign, develop, test, and deploy new features and services in a cloud-native environment.\r\nLead architectural decisions for backend systems and API design.\r\nMentor and coach junior and mid-level engineers.\r\nCollaborate with cross-functional teams to deliver high-value solutions that meet business requirements.\r\nBasic Qualifications\r\nBachelor's degree from an accredited university or college.\r\n7+ years of production development experience with C# and .NET or .NET Core.\r\nProven history of building and launching successful products and platforms.\r\nExperience delivering products that meet specifications and performance SLAs.\r\nSolid experience writing unit, performance, and automated end-to-end tests.\r\nStrong experience building APIs and backend systems with a solid grasp of software design principles.\r\nDeep understanding of the business context for which you are building software.\r\nActive participation in mentoring developers and building team consensus.\r\nPreferred Qualifications\r\nWorking knowledge of Vue.js or React in TypeScript.\r\nExperience with relational database design (MS SQL or MySQL), including performance tuning.\r\nHands-on experience with AWS services including S3, SQS, DynamoDB, and ElastiCache, as well as Apache Kafka and Datadog.\r\nExperience with microservices, distributed systems, Docker, and Kubernetes.\r\nFamiliarity with CI/CD pipelines, DevOps practices, and Infrastructure as Code tools.\r\nApplication security knowledge and experience with Git-based workflows.\r\nHands-on professional experience with AI coding tools such as Claude Code, GitHub Copilot, or equivalent.\r\nExperience with cloud data warehouse platforms (BigQuery, Databricks, or Snowflake) and proficiency in Python for data engineering or analytics workflows.\r\nBenefits\r\nGenerous base salary range of $124,000–$187,000 plus performance incentives.\r\nComprehensive healthcare coverage: medical, vision, dental, prescription drug, life, legal, and supplemental insurance.\r\nVirtual and in-person mental health counseling services.\r\nCommuter and parking benefits.\r\n401(k) retirement plan with matching contributions.\r\nEmployee Stock Purchase Plan.\r\nPaid time off and tuition reimbursement.\r\nOn-site fitness center and/or reimbursed fitness center membership.\r\nAccess to employee resource groups.\r\nComplimentary gourmet coffee, tea, hot chocolate, fresh fruit, and healthy snacks.\r\nLocation: Irvine, CA. Work arrangement: 4 days a week onsite with 1 day work from home.\r\nWe welcome all qualified candidates who are currently eligible to work full-time in the United States. CoStar Group does not provide visa sponsorship for this position.\r\nCoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and conduct pre-employment substance abuse testing. We comply with all fair employment practices regarding citizenship and immigration status. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation.\r\nJ-18808-Ljbffr","company":"CoStar Group","rawCompany":"costar group","city":"Irvine","state":"CA","isRemote":false,"isActive":false,"createdAt":"2026-07-04T02:34:28.854Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1251.00","title":"Computer Programmers","slug":"computer-programmers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"}],"industries":[{"code":"513210","title":"Software Publishers","slug":"software-publishers"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"},{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"LoopNet - Senior Software Engineer","description":"LoopNet – Senior Software Engineer\r\nCoStar Group is a leading global provider of commercial and residential real-estate information, analytics, and online marketplaces. We digitize the industry by delivering insights, products, and services that empower customers, employees, and investors. LoopNet, our flagship marketplace, connects brokers, buyers, and sellers worldwide.\r\nWe are seeking a highly skilled Senior Software Engineer with deep expertise in C#/.NET, AWS cloud development, and AI coding tools such as Claude Code or GitHub Copilot. In this role you will help build scalable, high-quality systems across our products—including LoopNet.com—while leveraging modern AI-driven development practices to accelerate delivery and improve code quality. You will also play a key role in architecture decisions and in mentoring engineers across the team.\r\nResponsibilities\r\nDesign, develop, test, and deploy new features and services in a cloud-native environment.\r\nLead architectural decisions for backend systems and API design.\r\nMentor and coach junior and mid-level engineers.\r\nCollaborate with cross-functional teams to deliver high-value solutions that meet business requirements.\r\nBasic Qualifications\r\nBachelor's degree from an accredited university or college.\r\n7+ years of production development experience with C# and .NET or .NET Core.\r\nProven history of building and launching successful products and platforms.\r\nExperience delivering products that meet specifications and performance SLAs.\r\nSolid experience writing unit, performance, and automated end-to-end tests.\r\nStrong experience building APIs and backend systems with a solid grasp of software design principles.\r\nDeep understanding of the business context for which you are building software.\r\nActive participation in mentoring developers and building team consensus.\r\nPreferred Qualifications\r\nWorking knowledge of Vue.js or React in TypeScript.\r\nExperience with relational database design (MS SQL or MySQL), including performance tuning.\r\nHands-on experience with AWS services including S3, SQS, DynamoDB, and ElastiCache, as well as Apache Kafka and Datadog.\r\nExperience with microservices, distributed systems, Docker, and Kubernetes.\r\nFamiliarity with CI/CD pipelines, DevOps practices, and Infrastructure as Code tools.\r\nApplication security knowledge and experience with Git-based workflows.\r\nHands-on professional experience with AI coding tools such as Claude Code, GitHub Copilot, or equivalent.\r\nExperience with cloud data warehouse platforms (BigQuery, Databricks, or Snowflake) and proficiency in Python for data engineering or analytics workflows.\r\nBenefits\r\nGenerous base salary range of $124,000–$187,000 plus performance incentives.\r\nComprehensive healthcare coverage: medical, vision, dental, prescription drug, life, legal, and supplemental insurance.\r\nVirtual and in-person mental health counseling services.\r\nCommuter and parking benefits.\r\n401(k) retirement plan with matching contributions.\r\nEmployee Stock Purchase Plan.\r\nPaid time off and tuition reimbursement.\r\nOn-site fitness center and/or reimbursed fitness center membership.\r\nAccess to employee resource groups.\r\nComplimentary gourmet coffee, tea, hot chocolate, fresh fruit, and healthy snacks.\r\nLocation: Irvine, CA. Work arrangement: 4 days a week onsite with 1 day work from home.\r\nWe welcome all qualified candidates who are currently eligible to work full-time in the United States. CoStar Group does not provide visa sponsorship for this position.\r\nCoStar Group is an Equal Employment Opportunity Employer; we maintain a drug-free workplace and conduct pre-employment substance abuse testing. We comply with all fair employment practices regarding citizenship and immigration status. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation.\r\nJ-18808-Ljbffr","datePosted":"2026-07-04T02:34:28.854Z","dateModified":"2026-07-04T02:34:28.854Z","hiringOrganization":{"@type":"Organization","name":"CoStar Group","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Irvine","addressRegion":"CA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"96eccbc585997c11ac83447f"},"url":"https://jobsearcher.com/jobs/96eccbc585997c11ac83447f"}}