Company Profiles

Callstack

Callstack

Callstack provides top cross-platform consultancy & development in React Native and React.js. We co-create and shape the technology as core contributors and innovators. Our main goal is to drive and accelerate software development innovation.

Office locations

Centrum, Warszawa

Active offers

2

Company type

Software House

Industry

IT & Software

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About Callstack

Hi, we are Callstack! A Total Software Engineering Consultancy specializing in building cross-platform full-stack apps set in React Universe for global enterprises and fast-growing startups. Do not hesitate to join us!

Number of employees

200

Year of foundation

2016

Origin

Poland

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 & Collaborations

You’ve definitely heard of our clients, including companies like PwC, DIRECTV, Major League Soccer, Evernote, and Amazon. What makes these partnerships work isn’t just code or business relations. We offer strategic input, product insight, and operational support that help their teams ship smarter, scale faster, and stay focused on what matters. From global brands to early-stage ventures, we collaborate like part of the team, because that’s exactly what we are.

Perspectives & Growth

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So, ready to grow?

Want to do meaningful work in a company that backs you to grow?

Benefits at Callstack

Benefits & Wellbeing at Callstack

At Callstack, regardless of your contract type, you will receive the same comprehensive benefits. They support flexible working hours, paid time off, sick leave, mental health resources, and personal development budget to help you grow and thrive both professionally and personally.

Flexible Working Hours

Callstack photo gallery

Get to know our daily life

Our office is full of life – it's a place where new ideas are born and friendships are made. We celebrate successes together, support each other through challenges, and maintain a good atmosphere. We organize various events that bring the team together and help us get to know each other better.

Get to know Callstack better

Follow Callstack on Social Media

Discover Callstack, a Total Software Engineering Consultancy specializing in building cross-platform full-stack apps in the React Universe for global enterprises and startups. Follow us to see our projects, technology insights, consulting expertise, and the vibrant life of our remote-first team.

What is it like to work at Callstack

Welcome to Callstack - where React Universe comes to life!

We are a vibrant software engineering consultancy with a passion for building cross-platform full-stack apps in the React Universe. Founded in 2016, we have grown into a 200-person team that works remotely by default, delivering scalable apps and solving architectural challenges for global tech leaders and startups alike.

Here at Callstack, we move fast and ship with purpose, valuing people as much as code. Our culture thrives on collaboration, innovation, and continuous learning. Whether it's our React Universe Conf, community contributions through blogs, podcasts, or open source projects, we are dedicated to pushing the boundaries of what React and React Native can achieve.

Fun fact: We offer the same benefits to everyone regardless of the contract type, including flexible working hours, paid time off, and mental health resources to ensure a balanced and supportive work environment.

Working hours

9:00 - 17:00

Dress code

Casual

Work type

Remote

Employment type

Any

Our Team and Culture

At Callstack, we are proud of our inclusive and supportive culture. With a remote-first approach, our team members enjoy flexibility to balance work and life while staying connected through engaging events, feedback sessions, and personal development budgets. We believe in ownership, impact, and growth from day one. Our community is driven by passionate professionals who thrive on collaboration and sharing knowledge.

Engineering

Working hours

9:00 - 17:00

Dress code

Casual

Work type

Remote

Employment type

Any

Our engineering team is the heart of Callstack. We are passionate developers, architects, and consultants specializing in React and React Native. We tackle complex problems, craft scalable architectures, and contribute actively to the open source community, making an impact beyond our projects.

Technologies We Embrace

We focus on modern and cutting-edge technologies that empower us to build high-quality software. Leveraging React, React Native, TypeScript, and various supporting tools, we ensure that our solutions are robust, scalable, and maintainable. Innovation and continuous improvement are key to our technology culture.

Work at Callstack