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I have hired dozens of engineers and have never failed do find great hires.
What I mostly do is just a conversation, which I call “geek conversation”, just like when you meet people at meet-ups or tech conventions.
With a simple talk I can first make the person relax, this allows me to have a great impression about her/his personality, passions, interests, personal roadmap, attitude towards problem solving and etc. Whenever we ponder on a more technical subject I throw some questions that might help me measure their technical level a bit, but what I care to measure is mostly awareness on things, nowadays software engineers need to be, above all, great at researching, for most roles they must have a broader overall knowledge and be able to creatively join the dots with a ton of pragmatism. I don’t care if they are able to implementing Dijkstra's or to modify a Trie in front of me, although having awareness of what problem these things solve is a good indication of some seniority.
These interviews take a lot more from me, I have to properly learn about the candidate and the role before I enter the interview and that requires people skills and real interest in the product, and of course I am not able to interview 40 candidates to find just “the best one” (which is ridiculous and something I actually don’t believe actually exists).
Yes there are roles which require the extreme algorithm coding skill, but those are a minority and it is unfortunate if your company is treating every candidate as if they were going to do that.
Ask HN: Should I fully test a take home interview challenge?
Also, how many hours do you think it would be fair to ask candidates to spend on these challenges?
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I couldn't find anything on the oficial web/blog, the single mention on security is this FAQ[1] which is about server/device encryption.
A friend also told me E2E is only available for US users but unfortunatelly I can't confirm this because of the lack of communication from WhatsApp.
[1] https://www.whatsapp.com/faq/en/general/21864047
Edit: fixed typos