Senior Full-stack AI Engineer (Vietnam based only)

Job Description This is a remote position. Location: Vietnam (Remote) Employment Type: Full-time About the Opportunity On behalf of our client, we are hiring a Full-Stack AI Engineer to join an innovative product team building next-generation AI-powered customer experiences. Our client is a fast-growing technology company focused on conversational 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 a Full-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-latency real-time voice pipelines (streaming STT/TTS, emotion-aware responses, sub-second turn-taking, and clean barge-in handling). Operate the WebRTC-based real-time transport layer (audio rooms, agent workers, and session lifecycles). Build Model Context Protocol (MCP) servers/clients to securely connect databases; implement agentic browser automation to execute real-world tasks. Deliver end-to-end features using Node.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 experience in Node.js and TypeScript. Hands-on LLM experience (tool calling, structured outputs, multi-step orchestration, context management), ideally with Vercel AI SDK. Production experience in real-time voice/streaming media (STT/TTS, turn detection, latency tuning) and WebRTC infrastructure. Familiarity with agent protocols (MCP, AG-UI) and agent-driven browser automation. Strong React or Svelte skills with advanced TypeScript, 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 on AWS and Vercel serverless/edge runtimes. Familiarity with RAG , vector databases , and retrieval pipelines . Experience embedding JS into 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 of WCAG AA accessibility for voice and conversational UIs. Benefits Competitive salary paid in USD via Remote.com (EOR model). 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. How to Apply Send your updated resume to [email protected] For more details, contact: Ngoc Tran (Ta Hy) - Recruitment Consultant ngoc.tran@sunbytes Zalo/Phone number: +84 (0) 945 555 790