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Grammarly Work Note 2023-05-25

Grammarly Work Note

Experiments Team's Goal is to...

  • Make experiments easy
  • Make experiments consistent
  • GNAR is the single source of truth that logs all of the relevant data. Grammarly is trying to move away from GNAR to Databricks.
  • Manakin has 4 versions: Dev, QA, Preprod, and Prod. Preprod and Prod must be the same, and whereas Dev and QA is relatively free to tamper with data.
  • Metrics is what we use to extract information.

Entity Relationships

Experiment Team services


  • Target Metrics (Cannot modify after creating the experiment. i.e., no cheating after the event)
  • Health Metrics
    • Guardrail Metrics (I don't want to screw this up accidentally)
    • Informational Metrics

Improving Scorecards


Managing metrics is easier with a scorecard as it serves as the front end. In the past, we didn't have a scorecard and relied on experimenting with birds to extract GNAR data, which only showed numbers and not the p-value. Our goal is to create historical lines to improve our metrics management.

Why not buy a solution at Grammarly?

The reasons for this are mainly historical. First, Grammarly boasts a comprehensive, personalized architecture. The initial setup did not include a data lake. At its inception, there were no suitable public alternatives available. Additionally, the experimentation culture is ingrained in the user interface. Finally, choosing to purchase the product means adopting its unique work style. Our goal was to establish a work style that suited our needs.

Some things to keep in mind

  • p-value hacking
  • E2E testing should be something we must do as a failsafe. It prevents the human problem from happening again.
  • Improving testing cadence: but we should be careful about Vanity Metrics
  • Interaction Effect. when two experiments affect each other.
  • Potential solutions:
    • 1 experiment at a time.
    • each experiment in one swim lane.
    • measure independently → Our goal!

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