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Permanent, full-time, hybrid (3 days per week in an office) #LI-Hybrid #LI-IM1


StoneX Ltd is an FCA authorised and regulated firm to provide trade execution, clearing and advisory services focusing primarily on the Commodities and Foreign Exchange sectors.

StoneX Ltd is part of the StoneX Inc. which is a Fortune 500 company, providing customers across the globe with services including execution and advisory services in Commodities, Capital Markets, Currencies and Asset Management.


We operate globally from offices in Europe, US and Asia Pacific. Our employees work closely together in multidisciplinary teams, making our success possible.

Technology - At StoneX, technology is at the heart of everything we do. Our technologists push the limits of possibility, embracing the right technology that adds value to our business. In our fast-paced environment, short feedback loops collaborating with our business partners allows us to deliver projects into... production quickly.

Focus – Our teams are business aligned developing and supporting complex solutions across Trading, Risk, Compliance and Operations.


We are looking for a Senior Software Engineer 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 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


• BS/MS degree in Computer Science, Engineering or a related subject
• Minimum 5 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
• 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
• Fluent English
Kraków Poland


Apply - Senior Mobile Developer - React Native Kraków