During the initial phase of designing a microservice architecture, you will identify the different components and functionalities required for the success of your project. Some of these components will have their own individual life cycles and will evolve at different speeds, while others will remain largely untouched. During this process, you’ll have to make a choice: build, or buy?

For most developers, the urge to build is overwhelming. I’m as guilty of this as anyone.

We take great pride in our ability to plow through complex obstacles and projects. We can code our way out of anything, we just need a little more time. So when the prospect of buying infrastructure comes up, the typical developer scoffs.

Statements like, “Whatever, I can build that in a couple of weeks, tops!” and, “Why pay that much, when I can build it myself?” are regularly thrown around the office.

https://buttercms.com/books/microservices-for-startups/should-you-build-or-buy-microservices/