I would definitely recommend Koval_Dev. From our very first interaction through to getting our enterprise mobile app for inventory accounting, it’s always a great experience. It’s an excellent mobile tool they made for us and I’m glad we chose Koval_Dev. Their team demonstrated great knowledge of the iOS ecosystem and was eager to suggest improvements to our existing application.
Chairman, Leica Camera AG

As a partner for launching OLX in Ukraine, Koval_Dev made invaluable job. The ability to manage everything effeciently and high technical expertise had a huge impact on our success. In addition the Koval_Dev team (support, marketing, development, sales – all of you!) are some of the best people I’ve had the opportunity to work with.
Super angel, entrepreneur

We hired Koval_Dev to improve one of our iOS apps and they coped very well. I had some initial questions, and my emails were answered almost immediately. Some problems were also found and were corrected immediately. Great customer support. Their team was able to rapidly familiarize himself with our codebase.
Manager mobile apps, Proximus

App they made for us has been a great addition to our extensive Poker fortfolio. Easy to work and communicate company. Great service from the team when I had a query, even offering me advice on how to maximise sales.
SBTech, Director of Playtech Bulgaria

Very prompt response times in relation to assistance. Happy customer. Lots of features and customization. I would recommend this team and their timely customer service. Keep up the good work guys. What’s coming next?
KBC Bank, Verzekering

Sergey and his team are a very professional mobile developers looking after delivering top quality iOS and Android applications. Based upon high level product requirements, Sergey is able to translate objectives into fully functional and tested deliverables within expected (agile methodology) timeframes. Especially his motivation and work ethics stand out, highest level of recommendation.
CPO, Co-Founder at Klarrio