You could try working on some open source projects. This will simulate what you would do on the job but the barriers of entry are low. A lot of projects have

You could try working on some open source projects. This will simulate what you would do on the job but the barriers of entry are low. A lot of projects have help wanted issues and many maintainers will support you Some maintainers are world class in their field. You'll be learning from the best and real people will use your code.