AI Engineer (LLM / Prompt & Fine-tuning)

Department: Platform

About the Role

This role is not about wiring up an LLM API. You will own the layer that decides how our models actually behave - prompt architecture, agentic tool use, fine-tuned models, and the evaluation system that tells us whether any of it is working. If you want to spend most of your time on model behavior rather than CRUD endpoints, this is that role.

Required

• 2+ years in software engineering, including at least 1 year building and shipping LLM-based features to production.
• Hands-on production experience with at least one major LLM API (Anthropic, OpenAI, or Google) and at least one open-weight model family (Llama, Qwen, Mistral, or similar).
• Hands-on fine-tuning experience (SFT, LoRA or QLoRA)
• Strong Python, with practical use of the Hugging Face stack or PyTorch.
• Experience designing prompts as engineered artifacts.
• Sufficient back-end ability to ship your own work: Python or Node.js, REST APIs, and endpoints consumed by web clients (streaming, cancellation, timeout handling).

Preferred

• Experience with inference optimization (vLLM, TensorRT-LLM, quantization) or GPU training infrastructure.
• Working knowledge of vector databases and embedding-based retrieval.
• Experience with multi-agent frameworks and orchestration.
• Experience with Vietnamese- or Korean-language model work, or multilingual evaluation.

Soft Skills

• Comfortable working with ambiguity - this field changes monthly.
• Evidence-driven: you reach for an eval set before you reach for an opinion.
• Positive, proactive, and highly collaborative.
• Comfortable reading recent articles and models, and translating them into something shippable.
• Strong analytical and problem-solving skills.

Application

• CV and a link to your GitHub or Hugging Face profile.
• A short description of one LLM feature or model you built: what the problem was, what you tried, how you measured whether it worked, and what you would do differently now. Half a page is enough.

- Mức lương cạnh tranh, xét tăng lương định kỳ.
- Đầy đủ BHXH, BHYT, thưởng tháng 13 và chế độ phúc lợi công ty.