Troubles reverseengineering a weight scale
Unfortunately even if that was a cheap scale, there is resin on one of the only chips of the board.

not even, but *because: packaging chips costs money. if you're producing a board in high quantities, and don't need to ever repair any of these, the direct wire bonding of silicon dies to boards is pretty common.
This is most probably an application-specific IC for scales. Scales are produced in the millions, under an extreme price pressure – thus making the design and manufacturing for an IC for this singular purpose sensible.
That design doesn't help you – you'll neither buy a wire-bonding machine nor 10000 of the scale ICs, so you probably won't even be able to buy this, even if you knew the manufacturer and type of the IC. Also, if you just want the features the all-in-one IC has, well, go buy a supermarket scale. Dropping an ASIC into the design that its manufacturer has prepared for you is... not that exciting.
So a simple microcontroller / ADC-based &quot;bespoke&quot; design of your own is the way to go.