Honestly that sounds a lot like the org is unhealthy. A Junior causing such delays by a single mistake? Better shapen up your processes and add more (or at all!

Honestly that sounds a lot like the org is unhealthy. A Junior causing such delays by a single mistake? Better shapen up your processes and add more (or at all!) review and some safeguards. Also there should be someone responsible to guide you (even in the absence of the lead) that you can turn to with your question, even if they might be basic or something that you should definitely know at this point. Sometimes you just draw a blank and there should be no judgement involved. IMHO a healthy org has most of their processes documented, so you can always turn to that first to look something up. Also it is expected that a Junior is "costing" more at first, so don't worry about this too much. I also tend to forget things so I have setup OneNote and write everything down that is important - maybe doing the same will work for you? (Other tools like private Confluence space or even simple text files work too!) Also I want to touch on your last sentence: I have seen principal engineers doing absolutely stupid mistakes because... they are people and people screw up from time to time. Don't let it bother you too much. You are self reflecting and want to improve, this is the most important first step. Keep working hard and smart, don't try to rush things, write things down, ask for help and the rest will come totally naturally over time :)