6 weeks. 176% more conversions. A component-based build for Callstack that drives growth.

Intro

Callstack approached us with a clear vision: transform their digital presence to represent their position as React Native leaders worldwide. Their website wasn't doing justice to their technical expertise and world-class work with their clients.

They trusted us with a complete website redesign and rebuild, focusing on a content-first approach and performance-driven design.

And the results hit different:

+176% conversion rate after the redesign

+65.7% organic traffic growth

Performance score: 34 → 90 on Lighthouse

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Meet Callstack

When giants like Meta, Amazon, and Evernote need React Native expertise, they call Callstack. Based in Wrocław, Poland, this 150+ team of engineers and designers has been at the forefront of React Native development since 2016.

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From performance optimization to brownfield migrations, Callstack has built a reputation for delivering results where others struggle. Their GitHub repositories have thousands of stars, their blog posts become industry references, and their team members are recognized thought leaders in the community.

They're the minds behind essential open-source tools like Re.Pack and Reassure and the go-to consultancy for enterprises tackling their most complex cross-platform challenges. With millions of developers using their libraries and $30M+ in annual revenue, they're not just building apps, they're defining industry standards.

When your website performance is worse than your clients' apps, you have a credibility problem. That's exactly where Callstack found themselves, React Native experts whose own site was holding back.

The challange we tackled

Callstack's website wasn't keeping up with their reputation. While they were building world-class apps for major companies, their own site was holding them back from connecting with new clients who judge technical skills by every interaction. They needed a website that wouldn't just look good, but actually perform.

Performance that didn't reflect their expertise‍

Their site scored 34 on Lighthouse, a missed legitimacy-building opportunity for a company that optimizes apps reaching millions of users. The 78% bounce rate meant potential clients weren't staying long enough to discover their capabilities, while a 2.1% conversion rate showed significant potential for generating qualified leads.

Limited search visibility

Only 1 in 5 of their target keywords appeared in Google's top 10 results. Potential clients searching for React Native experts weren't finding them easily.

Outdated tech stack

‍Built with jQuery, heavy assets, and poor optimization that didn't reflect their cutting-edge expertise and the efficient work they do for clients.

Unstructured content

‍Their CMS needed better organization. The team already generated great content, but their setup made it hard to organize and update. The marketing team spent too much time fighting with the website instead of creating more valuable content.

Tight deadline

‍They needed a strategic roadmap to production within 2-3 weeks max because important business opportunities were coming up, and they couldn't wait months for a traditional redesign. This required a phased approach - some parts custom-built, others leveraging proven Relume components to go live quickly.

Previous technical debt‍

As mentioned by the team, "our previous site is just broken". Messy CMS, poor structure, and maintenance nightmares that they didn't want to repeat. It was time to start fresh with something that worked from the get-go.

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We need this to be clean and must be very component-driven, because it's simply faster to build that way. For us specifically, it's not the brand, animations, or fancy visuals that sell, it's the content. So it needs to be clean, content must be clear, but it also needs to have that delicate touch.

Aleksandra

Content Lead at Callstack

The Callstack team understood the project objectives and role of Grafit and Callstack team from the beginning. The challenge was going from concept to live in 6 weeks, but their clear vision and direct feedback loop allowed us to move fast and focus on what matters: execution

Jakub Startek

Co-founder & CEO at GRAFIT

“Working with Callstack was incredibly efficient. They knew exactly what they wanted and communicated it clearly from the start. Their team stayed involved and gave us quick feedback, so we could work efficiently and get things done instead of going back and forth with changes.”

Marcin Warno

Co-founder & CTO at Grafit

Within days of launch, we saw organic traffic surge while performance metrics hit industry-leading standards. The new component-based architecture didn't just look good, — it empowered Callstack's marketing team to move faster while maintaining perfect brand consistency.‍

Summary

This wasn't just a website redesign – it was a complete digital transformation. When you treat your website as a business asset rather than just a digital brochure, magic happens. We created a platform that doesn't just represent Callstack's technical expertise, it amplifies it.

The results speak for themselves: 164% performance improvement, 65% traffic surge, 176% conversion increase. Most importantly, Callstack now has a digital presence that matches their world-class reputation and a flexible foundation that grows with their business - giving their team the tools to create, update, and expand without bottlenecks.

Feels like working with an in-house team. Fast, efficient, and they know how to build for growth. Simple as that.

Mike Grabowski

Founder & CTO at Callstack

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