About us

" 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

Tech Stack Upgrade

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

We can equip your developers with the latest knowledge and tools

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Rapid Team Expansion Developer Training

Consulting Mentoring Program

Gareth Jenkins -Head of Engineering at Checkatrade

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

Business Transformation

We specialize in helping businesses transform and thrive by leveraging innovative solutions

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Learning And Development Strategies Workstreams’ Optimization Product Shipment Acceleration

Work Efficiency Tech Scalability

Glen Moriarty - Founder and CEO of 7 Cups

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

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react native performance optimization ebook

Your complete compendium for peak performance from React Native experts.

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All you need to know about the React Native Performance Optimization Course

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All you need to know about the React Native Performance Optimization Course

Webinar

Organized by

Callstack

Date, Place & Time

Online

July 17, 2024, 7:00 PM CEST

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Join our online webinar and discover the ins and outs of our React Native Perfromance Optimization Course‍. Register today as the number of spots is limited!

All you need to know about the React Native Performance Optimization Course

All you need to know about the React Native Performance Optimization Course

Get a thorough overview of all course modules

Witness a live demo of the course

Get all your questions answered

meet our speakers

Jakub Romańczyk

Jake Krukowski

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