Sr Full Stack Developer AI Native

PennyMac-posted about 2 months ago
$90,000 - $150,000/Yr
Full-time • Mid Level
Onsite • Westlake Village, CA
1,001-5,000 employees
Real Estate
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PENNYMAC Pennymac (NYSE: PFSI) is a specialty financial services firm with a comprehensive mortgage platform and integrated business focused on the production and servicing of U.S. mortgage loans and the management of investments related to the U.S. mortgage market. At Pennymac, our people are the foundation of our success and at the heart of our dynamic work culture. Together, we work towards a unified goal of helping millions of Americans achieve aspirations of homeownership through the complete mortgage journey.

  • Design, develop, and deploy full-stack applications using React 19+, TypeScript, and modern backend frameworks or languages
  • Architect scalable APIs and data-driven services with attention to performance and reliability
  • Implement secure authentication flows, error handling, and production-grade monitoring
  • Design and optimize database schemas and ensure efficient query performance
  • Build responsive, accessible, and performant user interfaces
  • Leverage AI coding assistants (e.g., GitHub Copilot, Cursor, Claude Code) to increase development velocity and code quality
  • Contribute to internal developer tools, AI agent integrations, and LLM-powered features
  • Collaborate cross-functionally with product, design, and DevOps teams in an agile environment
  • Mentor engineers on AI-augmented coding workflows and modern development practices
  • 3+ years of full-stack software development experience in production environments
  • 2+ years of experience using TypeScript across front-end and back-end contexts
  • Expert-level proficiency in ReactJS and modern front-end development patterns
  • Strong foundation in backend engineering - Node.JS preferred, including: Scalable API design (REST or GraphQL) Database schema design and optimization Authentication and authorization best practices Concurrency and performance optimization Robust error handling and observability for production systems
  • Hands-on experience with cloud environments (AWS preferred) and microservice architectures
  • Demonstrated use of AI coding tools in professional development settings
  • Strong communication skills and a collaborative mindset
  • Experience with Auth0 or federated SSO integrations
  • Familiarity with LLM integration, RAG pipelines, or vector databases
  • Knowledge of Infrastructure as Code (Terraform, CDK, or CloudFormation)
  • Exposure to AI safety or responsible AI development
  • Comprehensive Medical, Dental, and Vision
  • Paid Time Off Programs including vacation, holidays, illness, and parental leave
  • Wellness Programs, Employee Recognition Programs, and onsite gyms and cafe style dining (select locations)
  • Retirement benefits, life insurance, 401k match, and tuition reimbursement
  • Philanthropy Programs including matching gifts, volunteer grants, charitable grants and corporate sponsorships
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