Site administration (on Bitrix)

Our Company needs a team of experienced professionals to administer and develop our Bitrix website.

The following tasks should be closed on an ongoing basis:
1. Administering the Companys website
1.1. A full audit of the site is required (written on Bitrix)
1.2. Refine and optimize everything that is needed (after the audit)
1.3. Ensure that all processes are integrated with Bitrix24 and 1C
1.4. Provide 24/7 site technical support (on pre-request, on certain days)
1.5. To quickly solve the problems of refining existing modules, developing and connecting new modules
1.6. Report on the work done (weekly)

The contractor will also have a number of design works (request to potential contractors to calculate the approximate number of working hours required to solve each of these tasks):
1. Issuing coupons to our customers
2. Option with the offer of goods that the customer does not take
3. The system of issuing promo codes to customers
4. Scoring system
5. Personal promotions for customers with an update every 3 days
6. Develop a mechanism to return customers to the site
7. Promotions for orders issued through the site
8. Mobile version of the site (perhaps non-adaptive on Bitrix, and a completely new site on another engine)

We are ready to discuss the budget with the responsible contractor (the ad indicates the budget "from").
We consider specialists with proven experience in solving similar problems.

We are waiting for your suggestions!