Looking for Full stack developer for multi-vendors system based on Yii2 (not agency)

Hi,
We are looking for long term relationship to develop multi-vendor startup.
We need full-stack devs to join existing one:

Skills Requirement
yii2, bootsrap, vue, elasticsearch, postgresql

You should have have experience with development of ecommerce website

System has the similar tasks like
A. Payment integration
B. 3rd party integration like google maps
C. Email sending management
D. Deep DB and performance management
E. User management (permissions, backend system, sign up with 3rd part services)
F. Vendors backend management
H. Bugs fixing.

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Please answer the following questions.

1. What is your backend experience, include yii2 - share links to project you developerd
2. What is your front-end experience (include vuejs, bootstrap) - share your experience
3. Do you have experience with gitlab
4. Do you have experience with payment integration? share links
5. Do you have experience with multi-vendors system? share links