Completion of the site on 1C-Bitrix

Need to modify a site on 1C-Bitrix, a reference solution for the Aspro/Next (who in the subject he will understand)

You need to install on the home icon whatsapp
explore and resolve errors on site guided Google speed test sites
to configure rejecti with a non-existent 404 pages on existing
modify some items in the item card
Understand. that TK was not specific for complete specifics I need to figure out Your approximate cost for this work list.

Contact amp only with experience of 2 years, with positive feedback of 30 . And specialization specifically development on 1C-Bitrix

If you read the whole info, and comply with, the response from write to read