most software is
built in silos

Most apps are built using multiple unconnected development approaches. This leads to duplication of teams, duplication of processes, and added complexity to daily work.

Software is only as good
as its surroundings

At Callstack, we believe an app is only as good as the environment it operates in. Which means siloed and dysfunctional organizations tend to create siloed and dysfunctional apps.

We use React Universe
to reverse Conway's law

Thanks to React Universe's cross-platform development approach, we not only help our clients build great apps, but great businesses, by streamlining their teams, simplifying their processes and transforming the way they work.

TOTAL SOFTWARE ENGINEERING

At Callstack we don’t just ship great code, but help break down structural barriers and remove points of friction across the business.

FOUNDED

2016

TEAM MEMBERS

200

HEADQUARTERS

WROCLAW

Meet our team

Architects of React Universe

Callstack is the Total Software Engineering consultancy that develops high-performing cross-platform apps using the React Universe tech stack. We work with global enterprise clients such as PwC, Major League Soccer and AutoZone, and fast-growing startups and SMEs like Evernote and Coinmine.

Tackling the toughest challenges

We make free Open Source tools and libraries that help millions of developers globally build better performing apps quicker and easier.

Leveling up the industry

We help raise industry standards by training developers around the world through business and technology podcasts, articles, and events, including React Universe Conf, the coolest React and React Native-focused conference in the world.

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our values

WE ALWAYS PLAY TO WIN

We lead the market by delivering the highest performance and exceptional value, setting ambitious goals and taking ownership to achieve them. With a focus on solving problems and creating opportunities, we continuously generate value for our customers by delivering the highest possible performance.

WE BUILD POSITIVE RELATIONSHIPS

We prioritize respect, understanding, and care for those around us by treating each other with respect, actively listening, and showing empathy. We address problems openly, seeking win-win solutions, and proactively share knowledge and experience. As active members of our professional communities, we support and uplift one another.

WE DRIVE FOR PERSONAL GROWTH AND WELL-BEING

We take responsibility for our growth and success by owning our professional development, seeking feedback to improve, and prioritizing our well-being. We recognize the importance of asking for help whenever needed to thrive.

WE INNOVATE FOR FUTURE SUCCESS

We shape the future by embracing the unknown, actively seeking and experimenting with new ideas while sharing the lessons we learn. We welcome innovation, challenge and improve existing processes, and have the courage to go beyond what is known today.