First they make you take a personality test, which is quite odd as those are quite random and game-able, predicting little about future performance, but it doesn’t take long at least. Then homework in two parts. One, find errors and report characteristics of some given Java code that is a completely broken, and two, do some simple Javascript work. You are strictly given 3 days both, though they pretend to be flexible about it. They are lying when they say so, so you better know both stacks going into the process. You will not be allowed time to learn despite whatever they tell you. Thankfully it's not a hard problem, just a bit of extra work if coming from nothing. I wouldn't be here if I just failed on the homework alone. I am here because they outright lied to me on not having a Javascript background was no problem, and that the due date for it was no problem, telling me only after I got the spare time to finish it. This is for the flagrant dishonesty, not the homework itself.

So, the process began with a HR pre-screen, where one HR lady described more details about the company and further recruitment steps. I must admit here, that the position was based in Warsaw with hybrid type of work. My geo location did not belong to Warsaw area, but HR lady decided to continue the process with me further. Additionally, I had capabilities of relocation to Warsaw. As a next step, I was provided with a short tech assessment task, where small microservice had to be implemented according to their requirements. They gave me 3 days to prepare it with a promise to provide a feedback within next 3 days after day submission. I submitted it having one free day left, since the task was easy. In the end they were "checking" my task about 1.5 week. I was pinging HR lady almost every day and one thing only I received during those days was: "they are really busy and can't check your test". Finally, I got an email from hiring manager with next feedback. They admitted my solution was good, but main reason to decline me as a good candidate was: I'm not located in Warsaw. To sum up all above, we have next situation: Efficy does not give a damn about their given promises. They can decline a candidate for really artificial reason and feed you promises that everything will be fine. My strong recommendation: avoid their job opportunities as soon as You spotted it opened.