# Full-Stack Engineer - Frontend Focus (SaaS)

**Company:** [WATI.io](https://jobs.workable.com/companies/sYuAkwkWwAW9SdiHKRYrxZ.md)
**Location:** Hong Kong, Hong Kong
**Workplace:** on site
**Department:** Engineering

[Apply for this job](https://jobs.workable.com/view/df45b109-3b58-4e86-a42c-a19a5e82628b)

## Description

**Wati** is the world's leading WhatsApp-first conversational growth platform, empowering businesses to build deeper customer relationships and accelerate revenue growth.

Trusted and loved by over 14,000 customers across 100+ countries, Wati has established itself as the premier choice for businesses leveraging WhatsApp and other messaging channels to connect with customers on their platform of choice.

In a world where real-time interactions drive growth, Wati's story is all about business growth through conversations. At Wati, we believe that every conversation matters, whether it's engaging a first-time prospect, nurturing a qualified lead, or deepening relationships with loyal clients. We transform these conversations into opportunities for building relationships, and strong relationships lead to increased revenue.

**Our Platform**

The AI-native platform simplifies complex business operations by bringing all customer interactions under one intelligent roof. Designed for scalability and ease of use, our solution delivers a measurable ROI while adapting to businesses of all sizes, from emerging startups to established enterprises.

**Our Backing & Partnerships**

Wati is proudly backed by world-class investors including Tiger Global, Sequoia Capital, DST Global, and Shopify. As a Premium-tier Partner of Meta, Google, and WhatsApp, we maintain the highest standards of integration and platform excellence.

**About The Role**

We’re looking for a Full-Stack Software Engineer with a strong frontend focus (about 80% frontend, 20% backend) to help build our next-generation AI Customer Service Agent. You’ll develop key user-facing features, integrate external APIs, and improve overall performance while working closely with the product and design teams.

**Job Responsibilities**

-   Participate in building the next-generation SaaS Customer Service Agent, responsible for the core architecture design and development of the AI Agent, ensuring seamless integration with existing products.
-   Engage in full-stack development and AI Agent construction, optimizing key modules such as decision-making, task scheduling, and multimodal data processing for performance and stability.
-   Integrate and call various external APIs to connect internal and external data sources.
-   Continuously optimize the Agent’s usability, stability, and effectiveness based on feedback and performance metrics, ensuring high performance and scalability.
-   Collaborate closely with product, design, and business teams to gather requirements, design scalable solutions, and drive rapid iteration and deployment.

## Requirements

-   Bachelor’s degree or above in Computer Science or a related field, with 3–5 years of relevant work experience.

-   Strong full-stack development capability, proficient in backend languages such as Python or Go, and good front-end experience including JavaScript / TypeScript and frameworks such as React, with clean and structured coding practices.
-   Familiarity with AI concepts and frameworks related to Agent development.
-   Strong problem-solving and independent working skills, with excellent communication and teamwork abilities.

**Preferred Qualifications**

-   Proficiency in using AI-driven development tools (e.g. Cursor) to improve front-end development efficiency.
-   Experience in developing Agent systems or automation frameworks; experience in secondary development on Dify or Coze is a plus.
-   Familiarity with cloud platforms such as GCP or AWS.
-   Fluency in English for daily work; management experience is an advantage.

**What You’ll Gain**

-   Opportunity to use cutting-edge AI technology to build and scale real-time communication systems supporting global users.
-   Close collaboration with senior engineers to rapidly grow your technical expertise.
-   Valuable experience in a fast-growing, international SaaS company.