System & Database Design for developers to work on highly scalable, highly available site 2

Looking for system design for developers to work on highly scalable, highly available site programming standards. Secondly, provide the cheap hosting servers to deploy on to Introduction we are Startup firm going to start writing code for our social media app. However, before writing code we want to set up scalable and highly available infrastructure to address needs in the best and cheapest way. System design Firstly, I am looking for design document for my developers to write code following highly available, highly scalable website standard patterns with an example good and cheap hosting provider. For e.g., Liquid Web. I like AWS cloud infrastructure but would be great if you can suggest with an example in a document Caching Caching is required to optimize the code so what & how to store in Memcache or Redis. Moreover, how to do/use local & global CDNs, image compression n al Media files How to use S3 Storage for media files Database Architect Looking for database architect for scalable site. We explored few things such as Vertical/Horizontal Sharding however we are not sure how good it is in real world to solve concurrency, outage, traffic, atomicity etc. and other database issues such as what if user relocate from one country to another having different servers to handle its request referring to local database and doesn't have user info. . Software Design How to design/write code for our scalable infrastructure. microservices or just one backend to make either thick or thin client web config settings how to use web config settings for highly available, scalable sites just some sample approaches, how to use IDs on different servers Cloud Infrastructure as a Service Provide cheap infrastructure to host our site to with an example