omnichannel SaaS

Hey everyone,

I’m currently building a multi-tenant SaaS that requires unified omnichannel communication (WhatsApp, SMS, Instagram/Messenger, Email, etc.).

I started prototyping with Twilio, but frankly, I’m not really liking the developer experience and pricing structure for this specific use case. I'm looking for a solid backbone that handles multi-tenancy cleanly without becoming a nightmare to scale or manage credentials per workspace.

For those who have built something similar:

What providers/APIs or open-source engines are you using for your messaging pipeline?

Are you orchestrating individual providers per channel (e.g., direct Meta Cloud API + Resend) or relying on an aggregator (MessageBird/Bird, Sinch, Infobip, Novu)?

Any hidden traps or lessons learned with multi-tenant rate limits or webhooks?

Would love to hear what your current stack looks like and what you'd recommend. Thanks!