Mid Frontend developer:

🚀 Mid-Level Frontend Developer (React Native & React) | Kraków (Hybrid)

Join the Engagement Team and help create digital experiences that keep millions of users connected, engaged, and coming back for more.

You’ll be part of J focused on building exciting customer-facing features that enhance the overall platform experience beyond core trading functionality.

🌟 What you’ll do

• Build sleek, high-impact features using React Native and React
• Develop new functionalities and improve existing products
• Create fast, intuitive, and engaging user experiences across mobile and web
• Collaborate with Product, Design, and Engineering teams in a modern Agile environment

✅ What we’re looking for

• Commercial experience as a Frontend Developer (3+ years)
• Strong hands-on experience with React Native (must-have)
• Good knowledge of React
• Solid JavaScript / TypeScript skills
• Passion for building polished, user-focused applications

🎯 Nice to have

• Experience with app performance optimisation
• Familiarity with testing and CI/CD
• Background in consumer-facing digital products

💡 Why join?

• Work on products used globally by millions of users
• Modern tech stack & collaborative engineering culture

🏢 Hybrid work: 3 days/week in office in Kraków

💼 Perm: UoP (+ bonuses)

We’re looking for true engineers — people who think, design, optimise and take ownership, not just deliver tasks.