Agata Kosior

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" Joining Callstack, I was excited, mostly because of one thing - I was going to work with experts who built open-source tools that I've been using in my projects...”

Jakub Urban

Senior Software Engineer

Technology

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Product Development and Growth

Optimization of Products and Processes

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Team Upskilling

Business Transformation

Product Development and Growth

We help companies of all sizes develop innovative products that let them stay on top of the game.

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Product Architecture Mobile App Development Web App Development

Integration Support For Wearables, TV, Consoles Integration Of New Features Into Existing Apps

App Testing and Quality Assurance App Maintenance

Nader Dabit - Senior Developer Advocate at Amazon Web Services

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

Optimization of Products and Processes

We provide everything you need to keep apps running smoothly and efficiently

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React Compiler Guided Implementation
App Performance Optimization

Technical Debt Reduction And Prevention Development Efficiency Boost

Brian Aznar - Engineering Director of Major League Soccer

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

Tech Stack Upgrade

TECH STACK UPGRADE

Use up-to-date technologies to unlock new levels of performance, scalability, and efficiency

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Architecture Redesign Adoption Of A Cross-Platform Approach Migration To The React Universe

Jin Chung - Co-Founder, CTO of Rainbow

“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.”

Team Upskilling