Senior Software Engineer - Applied AI Team

Senior Software Engineer – Applied AI Team

Job Description

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.

• Build large‑scale, distributed, API‑driven systems using Node.js and modern scalable design patterns on AWS.
• Design and implement infrastructure using Terraform, Docker, and build CI/CD pipelines for deployment.
• Architect and develop event‑driven applications leveraging AWS services (Lambda, SQS, Dynamo
  
  DB, S3, etc.).
• Integrate generative AI capabilities and deploy machine learning models into production applications.
• Build and optimize small classifiers and work with both generative AI and classical machine learning approaches.
• Drive and lead software design, development standards, code reviews and production releases.
• Collaborate closely with other Software Engineers and AI practitioners across the organization.
• Continually evaluate emerging AI/ML technologies and scalable architecture patterns to identify opportunities and best practices.
• Show willingness to take an active role in mentoring other developers.

• Bachelor's Degree required from an accredited, in‑person, not for profit university or college.
• 5+ years of production development experience with Node.js building large‑scale, mission‑critical applications.
• Strong understanding of modern scalable design patterns and distributed systems architecture.
• Hands‑on experience with AWS services including Lambda, SQS, Dynamo
  
  DB, S3, and other core AWS resources.
• Proficiency with Terraform for infrastructure as code.
• Experience with Docker and containerization technologies.
• Strong understanding of CI/CD pipelines and the full development lifecycle.
• Solid understanding of GenAI concepts and classical machine learning fundamentals.
• Experience in architecting, designing and building event‑driven applications in an agile environment.
• Proficiency in unit and performance testing.
• A track record of commitment to previous employers.

• Experience with machine learning libraries (Tensor Flow, PyTorch, scikit‑learn, Hugging Face Transformers).
• Hands‑on experience deploying machine learning models to production.
• Experience building small classifiers or working with model fine‑tuning.
• .NET Core development experience.
• Experience with Open Search, Redis, Kafka.

• Generous compensation and performance‑based incentives.
• Internal training and tuition reimbursement.
• Comprehensive healthcare coverage:
  Medical / Vision / Dental / Prescription Drug.
• Life, legal, and supplementary insurance.
• Virtual and in‑person mental health counseling services.
• Commuter and parking benefits.
• 401(K) retirement plan with matching contributions.
• Employee stock purchase plan.
• Paid time off.
• On‑site fitness center and/or reimbursed fitness center membership costs (location dependent), including yoga studio, Pelotons, personal training, group exercise classes.
• Access to CoStar Group’s Diversity, Equity, & Inclusion Employee Resource Groups.
• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacks.

CoStar is an Equal Employment Opportunity Employer. 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. CoStar is also committed to compliance with all fair employment practices regarding citizenship and immigration status. This position is not eligible for visa sponsorship. If you are a qualified individual with a disability or a disabled veteran, you may request a reasonable accommodation by calling 1‑855‑840‑1715 or sending an email to