We are looking for an expert Raspberry Pi developer with strong frontend & backend knowledge

We are looking for an expert Ruby on Rails Developer with significant experience with E-commerce Domain. We are looking for a developer who is familiar with the following skills: Ruby on Rails HTML / CSS Deployment via Heroku Admin Panels built using the forest RoR admin system Ecommerce ordering built on the Spree framework The modules we are expecting to have in the system: Brands Inventory Agents Retailers Orders User logins We are open to hearing your suggestions regarding which technology we should use for Front-end. What type of database we should use. Please feel free to share your suggestions in your proposal. While submitting the proposal please answer the following questions: 1. By reading the job description, do you have any suggestions regarding the tech stack like database & frontend tech? 2. You will be available for how many hours per week? Also please mention if you can provide support at night IST time if we are required anytime. We will ignore the proposals without answered questions. Thank you