Applied at Lumen Partners for trainee manager

I received an email from Lumen Partners today, inviting me to interview for a trainee manager role. This is the first time a company has reached out to me directly based on my CV, which feels a bit unusual. I've applied for several trainee manager positions in the past, but many turned out to be pyramid schemes, so I'm feeling cautious. I'm considering doing some research on Lumen Partners, including checking their Glassdoor reviews, to ensure they're a legitimate and decent place to work.