Architecture

Architectural Forms

See:

4+1 architectural view model: https://en.wikipedia.org/wiki/4%2B1_architectural_view_model

Very rough and imprecise overview:

REST
Microservices
SOA
Monolithic but modularization using language constructs (namespaces, packages, modules)
CQRS
Event Sourcing
Streaming
Batch Job
MVC (UI)
DDD - https://docs.google.com/drawings/d/1E_hx5B4czRVFVhGJbrbPDlb_JFxJC8fYB86OMzZuAhg

Integration

HTTP/REST
Messaging? (Queing, Broker, Brokerless)
RPC
DB
File