Principal Software Engineer

CoStar Group•Irvine, CA

3d•$214,000 - $297,000•Hybrid

About The Position

CoStar Group is seeking an experienced Principal Software Engineer to lead the architecture and design of software systems, encompassing full-stack web products and high-volume, secure data pipelines. This role involves designing new greenfield systems, translating product requirements into system architecture, and guiding the architectural evolution of existing complex systems. It is a highly collaborative position with significant influence on technical solutions, requiring strong communication and cooperation across multiple teams and disciplines, including developers and Software Architects. The ideal candidate is a problem-solving, collaborative individual with deep technical skills, capable of working in a secure, performant, enterprise-scale environment. This position is based in Irvine, with a hybrid work model: in-office Monday through Thursday and remote on Fridays.

Requirements

Bachelor’s Degree required from an accredited, not-for-profit, in-person college/university
A track record of commitment to prior employers
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 buildings secure systems and security minded development practices. Experience with financial data is a big plus.
Extensive experience in software engineering with expert-level proficiency in at least one of these programming languages: C#, Java, Python, JavaScript/TypeScript. Exposure to languages and platforms across the full web application stack is a big plus (e.g., GraphQL).
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.
Experience designing/implementing event-oriented architectures and real-time data streaming solutions.
Strong ability to communicate through architectural diagrams.

Nice To Haves

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.

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.

Benefits

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
Tuition reimbursement
On-site fitness center and/or reimbursed fitness center membership costs (location dependent)
Access to CoStar Group’s Employee Resource Groups
Complimentary gourmet coffee, tea, hot chocolate, fresh fruit, and other healthy snack