Principal Software Engineer

Company: CoStar Group, Inc.
Location: San Diego
Posted on: June 1, 2025

Job Description:

Principal Software EngineerJob DescriptionOverview: 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.Our CoStar for Lenders product development team is looking for an experienced Principal Software Engineer to own the architecture and design of our software systems, from full stack web products to high-volume, secure data pipelines. This role includes design of new greenfield systems, so being able to convert product requirements to system architecture is essential. It will also help guide the ongoing architectural evolution of our current solutions, meaning the ability to fully understand existing complex systems is required as well. It is a highly collaborative role that comes with great influence on the technical solutions we are building and requires strong communication and cooperation across multiple teams and disciplines.Responsibilities:

• 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 the right architectural direction based on project needs, level of effort, resourcing, timing, etc.
• Understand existing systems and ensure they are well documented, so that you become 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 that they are following 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 and development practices and identify how they might improve existing or new systems we are building.
• Develop a deep understanding of the CoStar business, and how the technical work we are doing aligns with that strategy.
• Advocate for and design solutions that are well-instrumented, so that we are confident we are building stable, high-performance products.
• Be a go-to resource in the understanding and diagnosis of complex performance, scalability, and reliability issues.
• Be an advocate for security and ensure that we are architecting and building secure software products and platforms.Basic Qualifications:
• Bachelor's degree, preferably in Computer Science/Engineering.
• 10+ years of hands-on experience in 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.
• Extensive experience in software engineering with expert-level proficiency in at least one of these programming languages: C#, Java, Python, JavaScript/TypeScript.
• Significant, hands-on experience designing and implementing solutions using Amazon Web Services (AWS) services including Lambda, DynamoDB, CloudWatch, CloudFormation, SNS/SQS, S3, API Gateway, etc.
• Experience with Test Driven Development methodologies.
• Experience modeling and implementing large-scale relational and NoSQL database systems.
• Strong ability to communicate through architectural diagrams.Preferred Qualifications:
• 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 DevOps.
• 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 CloudWatch and/or Kibana.
• Experience building highly secure software, including tokenization, OpenID, etc.
• Team or project leadership experience is a plus.What's in it for You: 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, tuition reimbursement, and an inter-office exchange program.Benefits include:
• 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
• 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 Diversity, Equity, & Inclusion Employee Resource Groups
• Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snacksWe 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. This position offers a base salary range of $166,000 - $291,000, based on relevant skills and experience and includes a generous benefits plan.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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Keywords: CoStar Group, Inc., Santa Ana , Principal Software Engineer, IT / Software / Systems , San Diego, California