Senior React / React Native Engineer

N-iX is looking for a Senior React / React Native Engineer to join our client’s Experience Platform engineering group. About the Client Our client is a leading Canadian online brokerage and wealth management fintech company. The platform provides retail investors with modern trading solutions, mobile applications, and a broad range of investment products within a highly regulated financial environment. About the Project The client is expanding its engineering presence in Ukraine and building a dedicated team consisting of a Team Lead, a Senior QA Engineer, and two product-focused development pods. Each pod includes four engineers and owns its domain end-to-end, covering web, mobile, and backend services. As a Senior React / React Native Engineer, you will join one of these product pods within the Experience Platform group. While the role has a strong focus on client-facing applications, you will also contribute to backend services and APIs that power mobile and web experiences. You will play a key role in shaping technical solutions, driving engineering excellence, and mentoring other developers. Responsibilities Lead technical design and implementation of complex features across React Native and ReactJS applications Build and maintain Node.js/TypeScript services and RESTful APIs supporting web and mobile platforms Drive application performance improvements, including rendering optimization, memory profiling, and bundle size reduction Break down complex business requirements into scalable technical solutions and deliverable increments Establish and promote best practices for code quality, testing, security, observability, and operational excellence Contribute to CI/CD pipeline improvements and application release processes Mentor engineers through code reviews, technical discussions, and knowledge sharing Collaborate closely with Product, UX, Architecture, and Security teams to deliver scalable and compliant solutions Participate in incident response activities and support production systems when required Evaluate and adopt modern engineering and AI-powered development tools to improve team productivity Requirements 6+ years of experience building and maintaining production-grade software systems 5+ years of commercial experience with React Native or ReactJS and at least 1+ year of experience with the complementary technology Strong expertise in JavaScript/TypeScript, component architecture, and state management solutions 1+ year of hands-on experience with Node.js and TypeScript Experience designing, building, or consuming RESTful APIs Solid understanding of microservices and service-oriented architectures Experience working with cloud platforms (GCP preferred; AWS or Azure is also acceptable) Practical experience with CI/CD processes and containerized environments Proven track record of leading technical initiatives and influencing engineering decisions Strong communication skills and upper-intermediate or higher English level Bachelor's degree in Computer Science, Software Engineering, or a related field, or equivalent practical experience Nice to Have Experience with real-time data streaming technologies such as WebSockets, Kafka, or Google Pub/Sub Background in financial services, brokerage, trading platforms, or other regulated industries Exposure to native iOS/Android development and native module integration Experience with mobile application delivery pipelines and release management Familiarity with AI-powered engineering tools such as Claude Code Knowledge of secure software development practices, threat modeling, or DevSecOps Experience building AI/ML-powered product features Angular experience   We offer*: Flexible working format - remote, office-based or flexible A competitive salary and good compensation package Personalized career growth Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more) Active tech communities with regular knowledge sharing Education reimbursement Memorable anniversary presents Corporate events and team buildings Other location-specific benefits *not applicable for freelancers