Debt Solutions - Principal Software Engineer; React​/C#​/AWS

Debt Solutions - Principal Software Engineer (React/C#/AWS) Job Description

CoStar Group (NASDAQ: CSGP) is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces. We are 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 over 35 years of experience creating data‑intensive applications and building a fast, reliable analytics platform.

The CoStar for Debt Solutions product development team seeks an experienced Principal Software Engineer to own architecture and design of our software systems, from full‑stack web products to high‑volume secure data pipelines.

Location:

San Diego (UTC Area). In‑office Monday through Thursday, work from home Friday.

• Work in partnership with Product and Technology leadership to deeply understand a project’s complex functional requirements and drive implementation of appropriate technical solutions.
• Collaborate with development teams to determine architectural direction based on project needs, level of effort, resourcing, timing, etc.
• Understand existing systems and ensure they are well documented, becoming a go‑to source of architectural information across multiple systems.
• Act as an architectural subject‑matter expert and source of good advice to technical leadership and developers.
• Drive and evangelize architectural principles and guidelines to ensure high quality, consistent results across teams.
• Partner with engineering managers to ensure they follow established architectural best practices.
• Create, organize, and maintain architectural diagrams and other system documentation.
• Provide architectural guidance and mentoring to other technical staff on topics such as microservices, micro‑frontends, high‑volume data streaming/event processing, etc.
• Stay up to date with emerging technologies, evaluate development practices and identify how they might improve existing or new systems.
• Develop deep understanding of the CoStar business and align technical work with strategy.
• Advocate for and design secured, well‑instrumented solutions to build stable, high‑performance products.
• Serve as a go‑to resource for diagnosing complex performance, scalability, and reliability issues.
• Advocate for security and ensure secure software products and platforms.

• Bachelor’s Degree from an accredited, not‑for‑profit, in‑person college or university.
• 10+ years of hands‑on experience designing highly complex enterprise‑level web applications, including deep knowledge of microservices, serverless, data, and web applications.
• Experience designing and building secure systems and security‑minded development practices.
• Experience with financial data is a plus.
• Extensive expertise in at least one of: C#, Java, Python, JavaScript/Type Script.
• Exposure to full web application stack (e.g., Graph
  
  QL) is a plus.
• Significant, hands‑on experience designing and implementing solutions using Amazon Web Services (AWS) services such as Lambda, Dynamo
  
  DB, Cloud Watch, Cloud Formation, SNS/SQS, S3, API Gateway, etc.
• Experience with Test‑Driven Development methodologies.
• Experience modeling and implementing large‑scale relational and No
  
  SQL database systems.
• Experience designing/implementing event‑oriented architectures and real‑time data streaming solutions.
• Strong ability to communicate through architectural diagrams.

• Architect‑level certifications from AWS, Azure or GCP.
• Experience with agile development methodologies.
• Experience with modern source control and CI/CD technologies including Git or Azure Dev Ops.
• Experience establishing software development best practices, including standards, code reviews, source control, builds, testing and operations.
• Experience with Infrastructure as Code in Terraform.
• Experience in observability logging/tracing with Cloud Watch and/or Kibana.
• Experience building highly secure software, including tokenization, OpenID, etc.
• Team or project leadership experience.

• Generous compensation and performance‑based incentives.
• Investments in professional and…