Hello,
I have a lot of experience with customisation and modules development for Odoo ERP (from v10 to v14).
That basically concerned to modules of sales, invoicing, website, web sales, payments (a lot of experience with different payment gateways integrations), POS, integration with other systems (telephony, marketplaces etc.) and deep customisations of basic Odoo (development of new fields and widgets, core widgets and forms modiffications etc.), but projects, events, stock, delivery and mrp modules also.
I have successful experience of payment modules development (integration with payment aquirers) for Odoo.
So I think I can help you.
If you are interested, feel free to contact with me to discuss details.
Thanks,
Max.