Senior AI Agent Engineer - LLM Apps & Automation

Wati Dot I O; Hong Kong; On-site; HKD 600,000 - 900,000; Full time

Job summary

Wati is seeking a hands-on Senior Software Engineer to build customer-facing AI agents and the shared platform capabilities that power them at scale. You will collaborate with product, design, and platform engineers to translate LLM capabilities into reliable customer experiences.

This senior individual-contributor role focuses on shipping end-to-end product capabilities, making pragmatic technical decisions, and strengthening the foundation as the product grows.

Qualifications

• 4-7 years of software engineering experience with backend or full-stack foundations.
• Experience shipping production systems with Python, TypeScript, or similar languages.
• Practical experience building LLM-powered applications, such as RAG, tool calling, agents, evaluation systems, or AI workflow automation.
• Strong ownership and debugging skills, and comfort working across product and infrastructure boundaries.
• Sound engineering judgment around reliability, privacy, latency, and cost in customer-facing systems.
• Clear written and spoken communication in a fast-moving, collaborative team.

Responsibilities

• Build and operate customer-agent capabilities, including conversation flows, knowledge retrieval, tool calling, human handoff, and messaging-channel integrations.
• Develop reliable LLM application services: prompts, context management, RAG, guardrails, fallback behavior, and structured tool execution.
• Build evaluation and observability workflows that measure answer quality, task success, latency, cost, and common failure modes.
• Partner with product, design, and customer-facing teams to turn real customer problems into shipped agent experiences.
• Improve the shared agent platform where needed: reusable primitives, APIs, testing, deployment, monitoring, and developer experience.
• Contribute to technical design and raise engineering quality through thoughtful implementation and code reviews.

Skills

Python

TypeScript

LLM apps

Backend

Observability

Debugging

Cross-functional

Job description

Wati is seeking a hands-on Senior Software Engineer to build customer-facing AI agents and the shared platform capabilities that power them at scale. You will collaborate with product, design, and platform engineers to translate LLM capabilities into reliable customer experiences.

This senior individual-contributor role focuses on shipping end-to-end product capabilities, making pragmatic technical decisions, and strengthening the foundation as the product grows.