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“Running our cooperation for just a few weeks by now, the Callstack team has already managed to upgrade the navigation library, which was invaluable in terms of addressing some tech debt issues. I recommend them as a trusted tech partner for running complex projects.”

Jin Chung
Co-Founder, CTO of Rainbow

“The team at Callstack are the most experienced and trusted engineers in the React Native community and ecosystem.”

Nader Dabit
Senior Developer Advocate at Amazon Web Services

“Callstack made the perfect staff augmentation partner. Their engineers proved to be a crucial part of our mobile app relaunch project.”

Brian Aznar
Engineering Director of Major League Soccer

“I appreciate their attention to detail, flexible approach and a high degree of expertise. I definitely recommend the Callstack team!”

Glen Moriarty
Founder and CEO of 7 Cups

“The collaboration was great throughout, with Callstack engineers seamlessly working as part of our agile teams.”

Gareth Jenkins
Head of Engineering ‑ Trades Product

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