As a new engineer on a team - how to contribute to system modernization by migrating legacy apps without creating a blip on the customer’s radar?

The answer is use-case dependent and very contextual.

But here are a few generic tips.

Perform the migration in stages.

Rather than attempting to migrate all of the legacy applications at once, break the process down into smaller chunks.

One service at a time?

Benefits - every stage can be tested thoroughly. Rollback is easier.

Blue-Green deployment

If this is already not a practice, recommend and establish one.

This involves creating a copy of the legacy app and its associated infra, and then directing traffic to the new version once it is ready.

Benefit - zero downtime

Transparent communication with stakeholders/customer

Provide regular updates, build and ensure that your customers feel confident in your ability to handle the migration smoothly

Finally - test like your life depends on it

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