Work in Callstack - Company profile

UI engineer passionate about building mobile and web experiences, high quality JS tooling and Open Source. Core Jest & React Native Community contributor. Space exploration enthusiast.

Łukasz Chludziński

Expert Software Engineer

RN developer with mobile background, highly skilled in performance optimization. Mentor in the field of Community and Trainings at Callstack. Podcast host at The React Native Show Podcast and DevSpresso: JS News.

Satyajit Sahoo

Expert Software Engineer

React & React Native ninja that will make your apps stand above the crowd. Contributed to various OSS projects in form of code, design, translation etc. Indicated on Facebook’s 2016 TOP 5 external contributors list.

Tech stack

React Native

React

Node.js

JavaScript

TypeScript

Next.js

Take a closer look

Simply, Callstack

We are Callstack, a React & React Native consultancy trusted by global tech leaders. Founded in 2016, we have grown into a 200-person, remote-first company that helps companies build scalable apps, solve architectural challenges, and contribute back to the tools they use every day. We move fast, ship with purpose, and value people as much as code.

Clients & Projects

You’ve definitely heard of our clients, including companies like PwC, DIRECTV, Major League Soccer, Evernote, and Amazon. Our role goes beyond writing code. We bring architectural input, product-level thinking, and engineering support that helps their teams move faster without cutting corners. From global platforms to early-stage stacks, we collaborate as embedded partners because we’re treated like part of the team. And we build like it, too.

Perspectives & Growth

We take growth seriously, and that includes yours. You’ll have access to a personal development budget, ongoing feedback, and the freedom to try new things. Whether you’re building in sales, marketing, project management, or finance, you’ll have ownership from day one, support when it matters, and the kind of impact you can actually see.

React Universe Conf & Community

You might have heard of React Universe Conf: a conference we created to allow the brightest minds in the community to push the boundaries of what’s possible with React and React Native. That’s just one part of how we show up. We write blog posts, run podcasts, and contribute to Open Source; not to market ourselves, but to move the ecosystem forward. We share what we learn and invite others to build with us.

Benefits & Wellbeing

Regardless of the contract, you will get the same benefits as everyone else! That means flexible hours, paid time off, sick leave, and access to mental health resources. We also support your growth and well-being with our personal budget and real tools to do great things.