"First of all, Square21 obviously has a team of highly skilled professionals. Besides, their approach is very flexible, very agile. They are focus and make an effort to really understand InterChange's needs."

"I`ve worked with several development teams before, and the team at Square21 was definitely one of the best. They are well-prepared, continuously improving, proactive, and flexible. On top of that, they are great individuals on a personal level as well, which plays a key role in ensuring that even under tight deadlines, projects can be delivered smoothly and successfully."

"Square21 transformed our existing pre-built checkout interface into a modern, highly scalable, fast, and extremely user-friendly solution. They started with a thorough technical audit and concluded with a complete redesign of the interface, allowing us to offer our customers a reliable, easy-to-manage, and future-proof payment process. Throughout the collaboration, we experienced a flexible and proactive approach – it was clear they love what they do – and they supported high-quality execution with valuable professional suggestions. The result exceeded all our expectations – we highly recommend them."

"I have worked with Daniel and Adam for many years as CTO for PrimeTradingFund, a Dutch hedge fund. They had a high work ethos, were always ready to improve, handled deadlines well, and added significant value to our fund."