Mobile Developer - React Native

Mobile

Mobile Developer - React Native

Mobile
-, Kraków

StoneX Poland

Full-time
Permanent
Mid
Hybrid

Job description

Connecting clients to markets – and talent to opportunity

 

With 4,300 employees and over 400,000 retail and institutional clients from more than 80 offices spread across five continents, we’re a Fortune-100, Nasdaq-listed provider, connecting clients to the global markets – focusing on innovation, human connection, and providing world-class products and services to all types of investors.

 

At StoneX, we offer you the opportunity to be part of an institutional-grade financial services network that connects companies, organizations, and investors to the global markets ecosystem. As a team member, you'll benefit from our unique blend of digital platforms, comprehensive clearing and execution services, personalized high-touch support, and deep industry expertise. Elevate your career with us and make a significant impact in the world of global finance.

 

Corporate: Engage in a deep variety of business-critical activities that keep our company running efficiently. From strategic marketing and financial management to human resources and operational oversight, you’ll have the opportunity to optimize processes and implement game-changing policies.


Responsibilities

Position Purpose: We are looking for a Mobile Developer with experience in building high-performing, scalable, enterprise-grade applications. The role will focus on developing complex mobile applications build on React Native running across IOS and Android devices.

You will be part of a talented engineer team that works on low-latency mission-critical applications. Roles and responsibilities include application architecture and development across full software development lifecycle from concept and design to testing, collaborating with like-minded engineers.

Primary Duties will include:

  • Primary focus on mobile development

  • Contribute to all phases of the development lifecycle working within Agile methodology

  • Prepare and produce releases of software components

  • Support continuous improvement by investigating technologies and presenting for architectural review

  • Mentor and supports engineers with technical direction and best practices


Qualifications

To land this role you will need:

 

  • Minimum 3 years’ experience in mobile app development

  • Experience in development of Android/iOS applications and have deployed on Google Play/App Store

  • Strong knowledge with architecture and implementation of Android or iOS applications, experience with full mobile development life cycle

  • Thorough understanding of React Native and its core principles

  • Strong knowledge with JavaScript & TypeScript, virtual DOM, asynchronous programming

  • Understanding & experience in ES6, ES10, JSX

  • Experience working with popular libraries for networking, asynchronous, image loading, etc.

  • In-depth knowledge with React Native framework, patterns for code reuse, state management libraries, routing architecture

  • Experience optimizing app performance, manage memory, and reduce load times

 

What makes you stand out:

  • Experience with TDD/BDD, testing framework (Jest/React-testing-library/JUnit)

  • Some experience developing distributed systems using Microservice architecture (event-based)

  • Some experience with containerisation (Docker, Kubernetes)

  • Some experience with cloud platforms (Azure)

  • Knowledge of Relational Databases SQL and No-SQL databases

  • Previous experience working with global teams

Education: 

  • BS/MS degree in Computer Science, Engineering or a related subject

Working Environment:

  • Hybrid (4 days per week in office) 

Tech stack

    Android

    advanced

    iOS

    advanced

    JavaScript

    advanced

    TypeScript

    advanced

    Mobile Apps

    regular

    React Native

    regular

    ES6

    regular

    ES10

    regular

    JSX

    regular

Office location

Published: 17.02.2026

About the company

StoneX Poland

🔹 We are a member of the Fortune 100 with 4,500 employees. 🔹 140+ currencies - StoneX Group Inc. offers currencies across 185 countries. 🔹 StoneX Group Inc. connects with clients in nearly 80 offices across 6 continen...

Company profile

Mobile Developer - React Native

Summary of the offer

Mobile Developer - React Native

-, Kraków
StoneX Poland
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