Career Counselling platform for working professionals

Hi All,

Asking on behalf on my friend cause he is not on Grapevine. To provide some background, he's an engineer who worked at Amazon for two years before pursuing an MBA at IIM. For the past year, he’s been working as a consultant at BCG. He's now looking for an online career mentorship platform where he can discuss his career trajectory. While I know LinkedIn and alumni networks are options, I’m curious if you use any other platforms for this purpose. The main expectation is that the mentors on the platform should have strong credentials and experience to offer valuable guidance.