Senior Backend Engineer — Enterprise SaaS & AI Agents

Wati; Hong Kong; On-site; HKD 600,000 - 800,000; Full time

Job summary

A leading SaaS platform provider in Hong Kong seeks a Senior Backend Engineer to drive core backend features for their multi-tenant WhatsApp Business API platform. This role involves designing APIs, debugging production issues, and using AI coding agents as a core part of the development workflow. The ideal candidate will have over 5 years of experience in software engineering, a solid understanding of backend development, and the ability to collaborate with international teams in English.

Qualifications

• 5+ years of software engineering experience with strong backend development skills.
• Experience designing APIs and async workflows for multi-tenant SaaS systems.
• Proven ability to debug and resolve complex production issues.

Responsibilities

• Design and implement backend features for a multi-tenant SaaS platform.
• Own technical designs and drive cross-repo coordination.
• Debug complex production issues across distributed systems.
• Build and use AI agents to accelerate workflows.
• Collaborate directly with PM, CS, and international teams.

Skills

Backend development

API design

Debugging complex production issues

AI coding agents usage

Problem-solving ability

Tools

.NET

Java

Go

Python

Node.js

MongoDB

Google Cloud

Job description

A leading SaaS platform provider in Hong Kong seeks a Senior Backend Engineer to drive core backend features for their multi-tenant WhatsApp Business API platform. This role involves designing APIs, debugging production issues, and using AI coding agents as a core part of the development workflow. The ideal candidate will have over 5 years of experience in software engineering, a solid understanding of backend development, and the ability to collaborate with international teams in English.