Senior Fullstack Architect: Go, React & Scale

Multicoin; Hong Kong; On-site; HKD 900,000 - 1,400,000; Full time

Job summary

Multicoin, based in Hong Kong, seeks a Senior Fullstack Engineer to lead design and implementation of scalable backend and frontend systems. You will architect APIs, build with Go on the backend and React/React Native on the frontend, and ensure seamless integration across client applications.

You will work with designers and engineers to shape the tech direction, make long-term architectural decisions, and drive performance, security, and maintainability in a fast-growing product.

Qualifications

• 5+ years of backend or lead engineering experience in a high-performance team.
• Proficient in Go; Rust or C++ for decentralized services is a plus.
• Strong architecture knowledge with MVC/MVCS/SOLID patterns.
• Experience building scalable services for tens of thousands to millions of users.
• Experience with PostgreSQL, Redis, and message queues.
• Knowledge of networking: TCP/UDP/QUIC/WebSockets.

Responsibilities

• Evaluate and optimize backend systems for scalability and performance.
• Develop and maintain RESTful APIs and server-side events.
• Build responsive frontend interfaces using React and React Native.
• Ensure secure, robust data handling and access control.
• Integrate with external systems and third‑party services.
• Monitor performance and drive architectural decisions.
• Review code and mentor junior engineers.
• Collaborate with designers to implement UI/UX designs.

Skills

Go

React

React Native

API design

Distributed systems

Tools

PostgreSQL

Redis

Message queues

libp2p

ZeroMQ

WebSockets

Job description

Multicoin, based in Hong Kong, seeks a Senior Fullstack Engineer to lead design and implementation of scalable backend and frontend systems. You will architect APIs, build with Go on the backend and React/React Native on the frontend, and ensure seamless integration across client applications.

You will work with designers and engineers to shape the tech direction, make long-term architectural decisions, and drive performance, security, and maintainability in a fast-growing product.