Ideally yes. But realistically no.
Ideally there would be management available and coaching on any junior SWE, or at least you'd hope so. Realistically he may be looking at the business end of a PIP.
Ideally there would be blameless post mortems. Realistically there's no such thing, if you fuck up bad enough you're going to be shown the door.
Ideally if you're a great software engineer you would be with a company for the life of the company. Realistically, the politics and toxicity of workplaces limit the career of any employee.