Full Stack Engineer - FinTech

Hong Kong, Hong Kong SAR, Hong Kong

Full Stack Engineer - FinTech

Job Description

About the Role

We're looking for a Full Stack Engineer to build and maintain features across our mobile and backend systems. You'll work on React Native for the mobile app and Java + Kotlin for backend services, collaborating closely with product, design, and QA to deliver reliable, high-performing experiences.

Responsibilities

• Develop and maintain mobile applications using React Native
• Build backend APIs and services using Java (and Kotlin where needed)
• Design, implement, and optimize backend components for performance, scalability, and reliability
• Integrate mobile app features with backend services (REST/GraphQL as applicable)
• Write clean, testable code and maintain strong engineering standards
• Participate in system design, architecture discussions, and technical planning
• Debug production issues and improve observability (logs/metrics/tracing)
• Collaborate with cross-functional teams to deliver new features from concept to release
• Maintain and improve CI/CD pipelines (as needed)

Required Qualifications

• 5+ years of professional software development experience
• Strong experience with React Native and building production-quality mobile features
• Strong backend development experience with Java
• Experience building and consuming APIs (REST/GraphQL)
• Solid understanding of object-oriented programming, data structures, and algorithms
• Proficiency with relational and/or NoSQL databases (e.g., PostgreSQL, MySQL, MongoDB)
• Experience with testing frameworks and practices (unit/integration testing)
• Familiarity with authentication/authorization (OAuth2/JWT or similar)
• Experience using Git and working with code review workflows
• Strong debugging skills and understanding of asynchronous/mobile-network behavior

Required Skills

Data FinTech Kotlin Mobile Applications Product Design REST Development Authorization Authentication Debugging React Native Pipelines Structures GraphQL Data Structures NoSQL Scalability CI/CD Algorithms Features Metrics Components Reliability React Architecture Software Development Programming Integration PostgreSQL Databases MongoDB Software Testing MySQL Git Planning Design Engineering Java

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