I personally wouldn't buy one from online. You need to go to store , sit on it and find one that suits you.
I also work in IT and spend 9hrs a day on a chair.
The link above actually is the closest one i could find of my chair.works decent enough. I got mine from a local shop for 7k.
This is a pretty comfy chair ..@8170
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I also spend 12+ hours on my chair I recently got from Amazon. 8.5k and worth it. The shops near my area didn't have good chairs so I went online.
So I have a family friend who manufacture chairs. Not a specific brand per se. But its very similar to this one
INNOWIN® Jazz High Back Mesh Office Chair (Black) for Office & Home https://www.amazon.in/dp/B07FTRJJPZ/ref=cm_sw_r_cp_apip_AGi33Wmn32kLw
Do these have different back designs?
The 2nd one seems to have the backrest a bit higher than the first one. I have the first one and i am experiencing back pains so im not sure if returning it and buying the 2nd one will solve it. Are they different enough that i might have a different experience with the 2nd chair?
This one but $10-$20 more for headrest which is out of stock right now.
Oddly, I feel much more comfortable after removing the lumbar support I don't know why...