Senior Full-stack AI Engineer (Vietnam based only)

About the Opportunity

On behalf of our client, we are hiring aFull-Stack AI Engineerto join an innovative product team building next-generation AI-powered customer experiences.

Our client is a fast-growing technology company focused onconversational AI, intelligent automation, and customer engagement solutions.This role offers the opportunity to work on cutting-edge AI applications that combine large language models (LLMs), real-time voice interactions, and modern web technologies to create impactful user experiences at scale.

As aFull-Stack AI Engineer,you will be responsible for designing and delivering AI-powered products end-to-end — from agent orchestration and backend services to real-time user interfaces and embedded web experiences.

Key Responsibilities

• Design single/multi-agent systems(OpenAI & Anthropic)with robust routing, tool calling, state, and recovery logic, primarily using Vercel AI SDK.

• Build low-latencyreal-time voice pipelines(streaming STT/TTS, emotion-aware responses, sub-second turn-taking, and clean barge-in handling).

• Operate theWebRTC-basedreal-time transport layer (audio rooms, agent workers, and session lifecycles).

• BuildModelContext Protocol (MCP)servers/clients to securely connect databases; implement agentic browser automation to execute real-world tasks.

• Deliver end-to-end featuresusingNode.js (TypeScript) and React/Svelte, streaming agent states over AG-UI, and shipping embeddable widgets.

• Tune for latency, cost, and reliability (streaming, caching, fallbacks) ; set up tracing(Langfuse, OpenTelemetry),implement prompt-injection & PII defenses, and run online A/B tests.

Requirements

Technical skills:

• 5+ years of production experiencein Node.js and TypeScript.

• Hands-onLLM experience(tool calling, structured outputs, multi-step orchestration, context management), ideally with Vercel AI SDK.

• Production experience inreal-timevoice/streaming media(STT/TTS, turn detection, latency tuning) and WebRTC infrastructure.

• Familiarity with agent protocols (MCP, AG-UI) and agent-driven browser automation.

• StrongReactorSvelteskills with advancedTypeScript,and comfort building framework-agnostic, embeddable components.

• Grasp of prompt engineering, agent evaluation, non-deterministic debugging, and security-first development (input validation, prompt-injection defense, secrets management, least-privilege).

Preferred Qualifications:

• Bachelor’s degree in Computer Science, Engineering, or equivalent

• Background in conversational commerce, personalization, or consumer web CRO.

• Deployment experience onAWSandVercelserverless/edge runtimes.

• Familiarity withRAG,vector databases,andretrieval pipelines.

• Experience embeddingJSinto third-party funnels and multi-tenant environments.

• LLM observability(Langfuse, OpenTelemetry) and online A/B testing.

• Experience with model routing, fine-tuning, and model cost-benefit trade-offs.

• Knowledge ofWCAG AA accessibilityfor voice and conversational UIs.

Benefits

• Competitive salary paid in USD.

• Social insurance coverage in accordance with Vietnamese regulations.

• 20 annual leave days plus 10 public holidays per year.

• Company-provided laptop.

• 100% remote working environment.

• Sponsored training, workshops, and industry conferences.

• Clear career growth opportunities with support from both local & international teams.

Send your updated resume

For more details, contact:Ngoc Tran (Ta Hy) - Recruitment Consultant

• ngoc.tran@sunbytes

• Zalo/Phone number: +84 (0) 945 555 790