Senior React Native Engineer

Tech Level: Senior
English Level: Upper-Intermediate
Employment Type: Full-time
Candidate Location: Poland
Working Time Zone: CET
Start Date: ASAP
Planned Duration: 12 months

Customer Description
A regulated digital asset company delivering services related to digital assets with a strong focus on regulatory compliance, security, and operational stability. The company operates in multiple global locations and serves both institutional and private clients.

Project Phase: Early-stage

Project Team
Project Manager, Internal Technical Lead, Internal Senior Engineer

Soft Skills

• Strong ownership mindset
• Proactive responsibility for assigned features
• Readiness to investigate and resolve issues efficiently
• High level of proactivity in communication and problem-solving
• Ability to spot gaps and incomplete work
• Willingness to suggest improvements and alternative solutions
• Ability to constructively challenge ideas
• Strong focus on quality
• Habit of independently testing own work
• Ability to improve acceptance criteria when needed
• Strong attention to detail
• Accountability for results rather than just tasks
• Creative and solution-oriented thinking

Requirements

• 5+ years of hands-on experience with React Native using TypeScript
• Strong understanding of modern React patterns and state management (e.g. Zustand, Jotai Toolkit)
• Experience with React Query or similar server-state management libraries
• Hands-on experience with mobile navigation solutions (React Navigation or Expo Router)
• Understanding of secure storage and basic mobile security principles
• Experience with unit and integration testing for React Native applications
• Ability to work with native modules
• Basic skills in configuring and troubleshooting Xcode and Android Studio
• High standards for code quality and delivery

Nice to Have

• Experience with banking or financial products
• Experience with enterprise-level CI/CD pipelines for mobile applications
• Familiarity with Expo modules and configuration plugins
• Experience designing scalable mobile application architectures

Responsibilities

• Develop a mobile application from scratch (greenfield project)
• Design and implement the overall application architecture
• Choose and configure the technology stack
• Set up and support CI/CD pipelines and core infrastructure
• Define development workflows and engineering best practices
• Contribute to building a solid technical foundation for the product
• Work closely with product management and internal technical leaders
• Take part in technical and architectural decision-making
• Deliver production-ready, high-quality solutions

Technology Stack
React Native, TypeScript, Zustand/Jotai, React Query, React Navigation/Expo Router, Expo, CI/CD, Mobile Security

Interview Process

• English check (15 minutes)
• Internal technical interview (1 hour)
• Client interview (1 hour)