Senior Fullstack Engineer

You will take end-to-end ownership of Payment and Settlement systems, designing, building, and maintaining scalable backend services and user-facing frontend applications. You will implement and optimize payment, clearing, and settlement modules, contribute to Android integrations, apply AI tooling to accelerate delivery, write well-tested code, and solve complex concurrency and security challenges.

Responsibilities

• Design, build, and maintain scalable backend services
• Develop and maintain high-quality user-centric frontend applications
• Architect and optimize payment clearing and settlement modules
• Integrate and ensure consistency of business logic across Android and web platforms
• Produce clean, maintainable, and well-tested code and participate in code reviews
• Leverage AI tools to prototype and accelerate development cycles
• Diagnose and resolve complex technical challenges in high-concurrency and security contexts

Requirements

• 5+ years of professional software development experience
• Proficiency in Kotlin; willingness to transition from Java or Go is welcomed
• Deep understanding of microservice and distributed system architectures
• Expertise in React or Vue for frontend development
• Hands-on experience or strong willingness to work with Android
• Familiarity with AI tooling such as Copilot and Claude Code and AI agent workflows
• Mandatory experience in Fintech, payment gateway, or e-commerce settlement systems
• Strong grasp of data consistency and financial-grade security practices
• Based in Shenzhen or Hong Kong
• Fluency in Mandarin and professional proficiency in English