A lot depends on two options:

 - Have everything ready and managed for you - MONEY

 - DIY (Do It Yourself) - TIME

OR

I am looking into:

- Having out own CI/CD based on Jenkins

- Manage container-based infrastructure by Kubernetes

- Define a more precise architecture (databases, protocols, patterns, etc)

Proposal for Development Workflow

- Design stage - (design document)

- Prototype stage - (optional)

- Implementation stage

- Review stage (Code reviews)

- Testing stage (QA)

- Deployment stage (going live)

- Planning stage - (feature definition)