Despite the modern tech stack the product is actually a distributed monolith, the microService architecture implementation is far from perfect causing numerous chronic repeatable bugs that require daily monitoring and fixing "by hands". The old-timers seem to be pretty comfortable with that (got used to repeatable fixing of their own lovely bugs) and patronizingly share their precious "know-how" as long as you obediently follow the instructions, but as soon as you point on a problem (or - God save you! - point the old-timers on their mistakes) and propose improvement - you become Persona non grata with your ideas and even pull-requests being blocked without explanation just because "they think there is an error" and don't apologise even after proved being wrong. All this is accompanied by toxic feedback culture when your people lead doesn't provide any constructive feedback during a year (what exactly you did good or bad and what to improve) and then on the annual performance review tells something like "you are just not good enough" - on one of your teammates opinion... again without any details or measurable improvement proposals. Of course that's true, as nobody can ever be good enough!... After the owner and CEO has changed in 2022, this new "feedback culture" was introduced and the policy became to shrink their own IT department and to outsource whatever they can to 3d parties so no perspective for career growth.