Company I’m interested in has a 3.7 rating on Glassdoor - Is this okay?

It's not exactly great, but I don't think it's low enough to auto-reject the company. If you convert 3.7/5 to a 100% score, that's 74%. That's a C, which isn't too bad 😛

In general, take Glassdoor ratings and anonymous online data in general with a huge grain of salt. I've seen companies with low ratings that I personally think are great (Airbnb's rating tanked to below 4 pre-IPO due to some leadership issues) alongside companies with good ratings that I personally think suck.

At the end of the day, there are no shortcuts. You should definitely read the online data, but the highest quality signal comes from reverse-interviewing and leveraging your network as I talk about here: https://www.jointaro.com/course/master-the-behavioral-interview-as-a-software-engineer/interviews-are-a-2-way-street/

Big Tech also isn't a monolith. At 3,000+ employees, you're going to have good teams, average teams, and garbage teams. That nuance can't be captured by a single rating number.

What's important is trends. If you see a common theme then take note of it.

• I agree on the points about trends being more important than absolute score, esp if there's a CEO/leadership change
• I don't trust Glassdoor ratings in general:
  • it's easy for employers to manipulate up by asking employees to rank them
  • it's easy for ex-employees to manipulate down since they have an axe to grind

Best would be to talk to engineers (especially Data Engineers, given your profile) and ask about their experience.