Full-Stack Developer: Build Apps & Demos

On On Technology Services Limited; Hong Kong Island; On-site; HKD 420,000 - 660,000; Full time

Job summary

On On Technology Services Limited is seeking a mid-level Full-Stack Developer to build mobile apps and web products for our clients end to end, covering front end, back end, and database work.

You will ship React Native mobile apps, Next.js web products, and manage databases and APIs while collaborating with designers to turn Figma concepts into production-quality interfaces and maintaining what you ship.

Qualifications

• 3–5 years of professional development experience.
• Production apps with React Native.
• Experience building web products with Next.js and TypeScript.
• Good knowledge of backend databases (PostgreSQL, MySQL, Firebase, Supabase, or similar) and API design.
• Ability to work across the full stack and own a feature from database to UI.

Responsibilities

• Build cross-platform mobile apps in React Native.
• Build web products in Next.js and TypeScript.
• Design and work with backend databases: schema design, queries, migrations, and performance.
• Build and integrate APIs, authentication, and third-party services.
• Work closely with designers to turn Figma files into production-quality interfaces.
• Deploy, monitor, and maintain what you ship.

Skills

React Native

Next.js

TypeScript

APIs

Database design

Tools

PostgreSQL

MySQL

Firebase

Supabase

OpenAI API

Claude Code

Cursor

Job description

On On Technology Services Limited is seeking a mid-level Full-Stack Developer to build mobile apps and web products for our clients end to end, covering front end, back end, and database work.

You will ship React Native mobile apps, Next.js web products, and manage databases and APIs while collaborating with designers to turn Figma concepts into production-quality interfaces and maintaining what you ship.