SharePoint Guru 111
Sure we can help in building custom web parts as we are building it since 2005 since the days of SharePoint 2003 till SharePoint 2016.
There are multiple choices of moving custom web parts to SharePoint online, we can do it with wsp package when we build and further it depends upon other features too, sometime we have to create a custom webpart on destination and move file by file. We are following these methodologies while working with Pfizer, AstraZeneca and few more satisfied clients in Australia.
Lets connect, we will provide you a link of all the previous work.
I am ex Microsoft & HP employee, definitely my previous experience and best practices across in medium and enterprise can be useful.
Here you are with Microsoft certified SharePoint experts who are working on SharePoint from the last 12 years. I & my team has completed 125+ SharePoint / Office 365 projects which involved SharePoint branding & customization, Power Apps, flow, BI, Dashboards, workflows, SSO, provider hosted add ins, custom we parts, timer, event receivers and many similar nature use of SharePoint.
I am available on skype, please share your skype id to take it forward.
Regards,
Manoj Kumar, PMP
MCSE