VIETTEL CYBER SECURITY | AI ENGINEER

Hanoi

Full-time

12/11 — 26/11/2026

Job Description

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esponsibilities

As an Experienced AI Engineer (AI Agent), you will take ownership of building reliable AI agents for assigned use cases, with a focus on basic evaluation, monitoring, and production quality.

  • Develop AI Agents for Product Use Cases
  • Develop AI agents for use cases such as conversational Q&A, data retrieval (text-to-SQL / Data Platform querying), compliance review, data analysis, and insight generation — as well as new use cases emerging along the product roadmap.
  • Build and optimize RAG pipelines, including chunking, embedding, vector search, reranking, and citation-based responses to ground agents in internal data and documentation and reduce hallucinations.
  • Apply prompt engineering, function/tool calling, and structured output; integrate LLMs with APIs, databases, and internal tools, with MCP (Model Context Protocol) as a preferred standard.
  • Test and validate AI agent accuracy, continuously optimize agent performance, and ensure safe operation in production environments.
  • Production Deployment & Quality Assurance

Implement basic evaluation (eval), monitoring, and tracing for AI agents; apply existing guardrails such as out-of-scope query handling and authorization enforcement, while optimizing token usage and latency according to product requirements.

Translate business requirements into AI agent workflows with clear error handling and fallback mechanisms; collaborate with Analytics, Backend/Data, and Product teams to bring AI capabilities into production.

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As a Senior AI Engineer (AI Agent), you will design AI agent systems that maximize the value of a unified and interconnected data platform. You will define technical standards for multi-agent systems, semantic layers, and release-gating evaluation, ensuring that the platform is reliable, secure, and scalable for sensitive cybersecurity data.

As use cases continuously expand with user needs and the product roadmap, you will design a general-purpose and reusable agent platform — including shared tools/MCP, semantic layers, and evaluation frameworks — that enables rapid development of new use cases while maintaining quality. You will also provide technical leadership and mentorship to the AI engineering team.

  • AI Agent Architecture & System Development
  • Design end-to-end AI agent architectures for use cases such as conversational Q&A, Data Platform querying (text-to-SQL / semantic layer), compliance review, data analysis, and new use cases driven by the product roadmap.
  • Design multi-agent workflows with agent handoffs, fallback mechanisms, and human-in-the-loop controls for irreversible or high-impact actions.
  • Build a semantic layer with consistent definitions of metrics, entities, and data lineage to improve agent reasoning and query generation across the unified data platform; standardize reusable tools/MCP services across the platform.
  • Build and evolve production-grade RAG systems, including hybrid search, reranking, retrieval quality optimization, and citation-based responses; establish data-driven mechanisms for continuously measuring and improving retrieval quality.
  • Quality, Reliability & Security
  • Build an evaluation framework that gates deployment, including golden datasets, model-graded evaluation, and regression suites integrated into CI pipelines; establish end-to-end observability and tracing.
  • Optimize LLM usage, latency, and cost; design monitoring and usage-management mechanisms across AI agents.
  • Design AI agents with protection against prompt injection, data leakage, unauthorized access, and other AI-specific security risks.
  • Make architectural decisions around scalability and maintainability; evaluate and select technologies aligned with the system architecture and product requirements.
  • Technical Leadership & Collaboration
  • Provide technical leadership through mentoring Middle/Junior engineers, conducting code reviews, and collaborating with Product, Data, and DevOps teams to improve the team’s engineering capabilities and delivery efficiency.

Qualifications

Experienced AI Engineer (AI Agent)

  • 3+ years of experience in software development and/or AI/ML, including hands-on experience building products powered by LLMs or AI agents.
  • Strong proficiency in Python and solid software engineering fundamentals, including Git, REST APIs, modular design, and unit testing.
  • Hands-on experience integrating LLM APIs, including prompt engineering, function/tool calling, and structured output.
  • Practical experience building RAG systems, including embeddings, vector databases such as Qdrant, Milvus, or pgvector, retrieval, and citation.
  • At least one hands-on Agentic AI project using frameworks such as LangGraph, LangChain, CrewAI, or AutoGen.
  • Experience working with tabular and text data.
  • Bachelor’s degree in Computer Science, Information Technology, Cybersecurity, or a related field.

Bonus Points

  • Experience with MCP (Model Context Protocol) and/or text-to-SQL / semantic layers.
  • Basic LLMOps experience, including evaluation frameworks such as RAGAS, DeepEval, or promptfoo, and observability tools such as Langfuse or LangSmith.
  • Knowledge of system architecture, including SQL/NoSQL databases, containers, message queues, and big data technologies such as Spark and notebooks.
  • Strong systems thinking and a product-oriented mindset.

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