Sounds a bit like something I'd started working on for home inventory. Of course, I didn't need a clean room. The QR codes were to be able to scan a box to pull it up online (with a URL). I used a CMS (Drupal 8) with a custom node type and fields, and included one for having parent/child relationships (e.g. you could have an item within a box within a box). The website was functional and I used a tablet, but data entry felt a little slow (something I could have eventually improved by making a more responsive client-side interface rather than the web server generating a web page each request). It was nice to be able to use the search function. Having pictures of my items was also a nice touch I thought. After some work, I decided a spreadsheet would be more productive for my purposes. I'd start with an empty box, write a number its sides with a marker (e.g. "Box 12"), and write everything in a spreadsheet. It saved me some development time, and I'm still able to determine quickly enough where I've stored some random thing I rarely use (e.g. the other day I needed a SVGA cable and located it in Box 20). I'm not sure about how to find someone good. I've helped with hiring other developers before, and it can be difficult to find good ones. You might want to try on guru.com or freelancer.com.