Senior Software Engineer (React Native)

Our mission is to 'help people to save and invest with confidence'. We are looking for great people to come and join us, so come and invest in YOUR future at HL.

Why join us?

• Work the way you want – fully remote from anywhere in Poland/the UK or hybrid from our modern offices.
• New products, no maintenance – focus on building innovative solutions from scratch, using the latest technologies.
• Healthy work-life balance – we value your time, which means no overtime culture.
• Be part of something big – your work directly supports a leader trusted by millions.
• Supportive, knowledge-sharing team – collaborate with experienced engineers who are passionate about clean code, best practices, and continuous learning.
• Modern tools & technologies – develop enterprise-scale solutions in a tech-driven environment.

Your responsibilities

• Develop and maintain mobile applications using React Native, React and TypeScript
• Frequently lead scoping of initiatives, consider boundaries and non-functional requirements
• Propose ideas, contribute to technology choices, and present solutions to the team
• Foster a culture of implementing commonly understood design patterns and processes
• Integrate with backend services via REST API and/or GraphQL
• Work with React Native’s new architecture, applying best practices for scalability and performance
• Write unit and integration tests using tools like Jest, Detox, and Testing Library
• Optimize the performance of mobile applications
• Implement and manage state management solutions (e.g., Redux, Mobx)
• Collaborate with backend teams and designers to ensure consistency and high-quality deliverables
• Strategically improve CI/CD processes and deployment strategies
• Troubleshoot complex technical issues and help scale mobile applications
• Actively participate in the Scrum process (stand-ups, retrospectives, and technology discussions).

Ideal candidate have

• At least 5 years of experience working with React Native, React and TypeScript including enterprise-grade experience (experience with large app decomposition, layers separation, and scalable architecture for enterprise-level applications).
• Experience with architecture and design patterns.
• Familiarity with different styling solutions (StyleSheet, Styled Components, Unistyles).
• Efficient React Native debugging skills — ability to troubleshoot and resolve complex issues with React Native applications using debugging tools, logs, and error tracking.
• Practical knowledge of JavaScript and testing frameworks (Jest, Detox, Testing Library).
• Experience in Brownfield Development.
• Experience working with REST API and/or GraphQL.
• Understanding of state management patterns and solutions like Redux and Mobx.
• Knowledge of native iOS development (Swift, SwiftUI, Combine) and Android development (Kotlin). Proficiency in using native build tools like Xcode, Gradle, and Android Studio.
• C1-level proficiency in both English and Polish – you will use both languages in all aspects of your daily work

Nice to have

• Experience integrating mobile apps with external services.
• Experience with TurboModules and TurboComponents.
• Experience with accessibility (a11y) best practices in mobile apps, including WCAG compliance and keyboard navigation support.
• Experience with UX/UI design best practices.

Soft skills & team fit

• Collaborative and communicative – you work well with others, share knowledge, and express ideas clearly.
• Solution-oriented and creative – you tackle challenges with practical, innovative solutions.
• Quality-driven with a continuous improvement mindset – you take pride in delivering clean, secure, and maintainable code while seeking ways to improve.
• Eager to learn and adapt – you embrace new ideas and grow with your team.
• Comfortable in Agile environments – you thrive in cross-functional collaboration and value constructive feedback.