There's a few vendors that sell FreeRTOS forks that have that cert. SAFERTOS is a very common one

> mature tooling and ecosystem

Amazon has been working on freertos for a long time

> easy to hire experienced devs

tbh if you've used one rtos, you've used them all. the learning curve is in the concepts, not the api. any good vendor will have engineering support that helps you where appropriate

> “it worked for the last 5 projects”

inertia only takes you so far