Hey there !!
We can do all your given modification as Separate registration page, Linkedin integration,make notification icon on top and do all All PayPal integrations in your theme according to requirements.
We have 6+ years of experienced professional with expertise in graphic design,CSS & HTML design,responsive,bootstrap, theme development,theme customization,theme installation and theme setup,modules integration,modules development and customization.
We have very good commercial experience in analysis, design, development, testing,website migration and implementation of wordpress websites.
We would like to discuss on project in more detail manner so that we can explain you the working process and our understanding towards your project and our action plan.
Looking forward to receiving your positive reply.
Best Regards
Pranay