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Principal Engineer Backend

PENNYMAC

$90,000 - $150,000
Dec 29, 2025
Westlake Village, CA, US
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Pennymac is looking to solve the problem of building a transformative AI platform from the ground up to power their autonomous AI agents, manage their Unified Context Library, and orchestrate multi-step developer workflows, with the goal of helping millions of Americans achieve aspirations of homeownership.

Requirements

  • Node.js
  • TypeScript
  • Cloud-native (AWS) environment
  • AWS Bedrock AgentCore
  • LangChain.ts
  • GitLab
  • Jira
  • ServiceNow
  • Language Server Protocol-style backends

Responsibilities

  • Architect and build the core backend systems for the AI SDLC platform in a cloud-native (AWS) environment using Node.js and TypeScript.
  • Design, implement, and scale the Unified Context Library, our RAG (Retrieval-Augmented Generation) foundation.
  • Develop robust orchestration flows for autonomous AI agents using frameworks like the AWS Bedrock AgentCore and LangChain.ts.
  • Build and maintain secure, scalable APIs for deep, bi-directional integrations with third-party developer tools (e.g., GitLab, Jira, ServiceNow).
  • Engineer high-performance developer-focused services (e.g., Language Server Protocol-style backends) that can interact with code repositories, run linters, parse test results, and provide real-time feedback to AI agents.
  • Take full ownership of the services you build, from architectural design and implementation to DevOps (IaC), testing, and production operations.
  • Recommend and evaluate new technologies, architectures, and processes to ensure our AI platform is scalable, resilient, and cutting-edge.

Other

  • Bachelor's degree or higher
  • 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