[meiuqer]

I know you're asking for advice and not looking for someone to hire here, but the company I work for does just what you are asking for: Creating custom made software for B2B companies.

Check us out at www.bizzomate.com

We are focused on low-code solutions but we try to understand the customers needs through service design. We also have our own business rule engine that might be useful to your case. We also have experience building mission critical ERP-systems.

Anyway, check us out and feel free to contact us!