Ramp up time for IC5

You have ~6 months to stabilize from your join date (9 months would be the maximum stretch). If you have a decent manager, they'll likely save you if you get a Meets Most (MM) trending towards Meets All (MA).

A lot of this will depend, of course, on the tech stack and domain. In a frontend product team, I'd expect the senior engineer to have run some experiments (or at least have committed decent code) within a few months. On the other hand, in a deep infra team, it will likely take much longer for a Senior Eng to be fully independent.

The tactic I'd recommend is to talk to and observe the following people:

• Other tenured E5 engineers. Look at their output and contrast it with your own output.
• Other engineers that joined with you ("a few months back"). If they are much more familiar with the tooling or code output, that's a problem.

You get a rating every 6 months with a full-blown PSC happening every year. Working backwards from that, 6 months is the absolute latest you can be at effectively 100% productivity.

In the current economic climate, particularly at Meta, I think it's much shorter nowadays. After 3 months, you should be 90%+ of the way to full productivity as an E5.

I made a case study about onboarding at senior+ levels at top companies here: [Case Study] Becoming A Tech Lead Again In Just 1 Month After Joining Robinhood From Meta

Check out the onboarding course too: The Complete Onboarding Guide For Software Engineers