Jonathan Westerfield

Résumé

Résumé

I'm a backend and platform engineer with 5+ years at Amazon. My recent work includes Java service and API-contract changes, production validation and diagnostics, and an open-source retrieval platform built with Python and FastAPI.

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Experience snapshot

Selected experience

  1. Librarian

    Independent Software Engineer July 2025–Present

    Building an open-source, local-first retrieval platform for long-form EPUB libraries.

  2. Amazon — Annapurna Labs

    Software Development Engineer II December 2022–July 2025

    Built diagnostics, APIs, and validation tooling for accelerator hardware platforms.

  3. Amazon Ads

    Software Development Engineer May 2021–December 2022

    Delivered Java services and platform capabilities for pricing experimentation and auctions.

  4. AWS Directory Service

    Software Development Engineer June 2020–May 2021

    Improved security, monitoring, and production change-management tooling.