For me application I hired professionals from Jatapp, you can go to site to find more info. They offer full-circle software dev services and have affordable prices. Useful service if you want to get your own app fast and at high level. Plus they offer QA testing services and can help to cut testing costs.
There are a lot of good companies in my opinion. For myself, I can single out only one. I found them by chance and went to https://sam-solutions.de/. I got acquainted with their work, with action plans, certificates, and so on. I read the reviews on the Internet, too. All this I was looking for because I needed a qualified app developer. After working together, I have only good impressions.
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