What modern tools exist in designing services like Instagram and Facebook?

Question

Software design

What services and applications exist for designing information systems, and not something simple and banal at the level of IDEF0 and DFD diagrams, but more serious and more widely used. What, for example, do Instagram, Facebook, VK design? What solutions are used for this?

Answer 1

It's called the head.
Services such as FB, VK, Instagram have been created over years and decades.

1. No one painted anything in advance for decades to come.
   
2. No one has drawn and does not draw schemes in full, only partial ones are drawn. for subsystems.
   

Answer 2

UML is quite comprehensive. And, rather, there are no design tools as such, but there are implementation approaches and technologies that are selected depending on the initial requirements: frameworks, ready-made blocks, self-written modules and services that glue everything together, implementing the main logic.

Answer 3

For example https://www.draw.io or https://www.lucidchart.com

Answer 4

There are complex CASE tools for developing information systems. For example ARIS and System Architect. In addition, there is such an approach to software development as model-driven development . The English version of this article lists the tools that implement this technology. From the point of view of these technologies, the applications you listed are not complex systems, but quantitative changes turn into qualitative ones, so they face difficulties in processing large volumes of requests and storing large amounts of data, maintaining system availability and delivering the application to users. This is highload.