An SDE-3, been in the company for 7 years (2.5 L4, 3 L5, and 1.5 L6), and still struggling to get over Imposter syndrome. I have always got positive feedback from my direct/skip but there is this constant feeling of "Not good enough" that I feel holds me back from achieving my full potential. Here is a few things that I regularly do to fight it off: 1.Maintain an above average rank on competitive programming websites (TopCoder and HackerRank). This helps get over 'What if I get fired'. 2. I have a mentor but I don't know how to talk openly about this issue. 3. Regular Design documents and getting feedback from other SDE-3s in the org. I am interested in knowing what other people do to get over this irrational feeling.
Topcoder is dead. Do codeforces!
My imposter syndrome comes because choices made in career trajectory. Look at this example ... I could have stayed in my previous job but took this one because of big data. I could have stayed in my previous big data job but took this one because it had ML. I could have stayed in my previous ML job but took this one because it pays 2x more and has people smarter than me all around me. So now I am working in a hyper competitive environment on a tech stack which is highly complex and something I learnt just yesterday. In the end if the imposter syndrome becomes too much, you have to take the foot off from the career accelerator and let things settle a bit. But that may mean less prestige and money.
If you're an imposter you can't get over it.
Conduct interviews
Man fight a PE. corner a sde and ask him to solve a DP problem in 20 mins. If you win at both, you the alpha here.
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Steven Furtick said it best: "The reason we struggle with insecurity is because we compare our behind-the-scenes with everyone else’s highlight reel." In some ways this feeling is what pushes us to go beyond our peers because we feel we are inadequate so we work harder, Dunning-Kruger effect describes this in more detail. I think you are doing all the right things OP but perhaps try to frame your insecurities in a more positive light - like "what do I need to do to be better than everyone in this room?" instead of stressing over "what if I get fired?".