Alejandro Rafael Castro

S

Senior ML Engineer at Orbit Systems | ex-American Express

Orbit Systems
Los Angeles, CA · PT (UTC-8)
5+ years experience
UCLA
English
Messaging unavailable

Overview

Currently at Orbit Systems, where I work on ML infrastructure. Brought on-call pages for ML platform down from 15 a week to 2. Shipped a rewrite that took build times from 42 minutes to under 3. Most at home with threat modeling and feature stores.

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Skills
CUDAPythonPyTorchKubeflowfeature storesmodel servingthreat modeling

Experience

  1. Senior ML Engineer
    Jul 2025 - Present
    Orbit Systems · 1 yr 3 mo · Full-time · Los Angeles, CA
    • Wrote the metric definitions the leadership team reviews every week.
    • Taught SQL to 80 non-analysts.
    • Built the recommendations models now used in 5 product decisions a quarter.
  2. ML Engineer
    Jan 2024 - Jul 2025
    American Express · 1 yr 6 mo · Full-time · Los Angeles, CA
    • Shipped a ranking change that increased conversion 7.7%.
    • Replaced 102 hand-built dashboards with one metrics layer people trust.
  3. ML Engineer
    Oct 2021 - Jan 2024
    Lyft · 2 yr 3 mo · Contract · Los Angeles, CA
    • Moved the homepage from rules to a learned ranker.

References

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Education

  1. UCLA
    BS, Electrical Engineering
    2016 - 2020

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