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Engineering2020

R to Python Migration

Migrated a critical R algorithm into Python so it could plug into modern services.

Architecture & workflows

How this product is built, deployed, and operated in production.

Delivery flow

End-to-end delivery flow for this project, from intake through the final handoff.

Challenge

The R black-box was hard to deploy beside the rest of the Python stack.

How we did it

Reimplemented logic in Python with parity tests against R outputs.

Outcome

Easier deployment, CI, and integration with APIs and pipelines.

Tech stack

RPythonNumPypytest

Step-by-step

  1. 1

    Baseline

    Capture R outputs on golden inputs

  2. 2

    Port

    Rewrite algorithm in Python

  3. 3

    Parity tests

    Diff Python vs R results

  4. 4

    Package

    Expose as a library/service

  5. 5

    Retire R

    Cut over callers to Python

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