[HN] Middle AI Engineer (LLM)

Full-time · Hanoi

• Job Type : Full-time, Onsite
• Location : H10 Building, 475 Nguyen Trai, Thanh Xuan, Hanoi
• Working Hours : Monday - Friday (08:00 AM - 05:30 PM)
• Website : https://wigin.ai/

ABOUT WIGIN AI :

Wigin is a product-led AI company powered by a team of leading engineers across the artificial intelligence and technology sectors. The company specializes in building production-grade solutions that transform frontier AI research into reliable, scalable systems engineered to deliver real, measurable value for businesses. Rather than just creating theoretical models, Wigin focuses on engineering practical products that win at scale and optimize how businesses actually run.

The company operates across three core domains:

(1) AI Services

(2) AI Investment Intelligence

(3) AI Products

ABOUT THE ROLE:

We are looking for a Full-time AI Engineer to join our team and work on projects involving Large Language Models (LLMs) and Generative AI .

You will work closely with a technical team to design, fine-tune, evaluate, optimize, and deploy advanced language models for real-world applications. This is a great opportunity for candidates who want to work deeply with frontier LLMs, Retrieval-Augmented Generation (RAG) architecture, AI Agent systems, and large-scale GPU infrastructure

WHAT YOU'LL DO :

• Research, develop, and apply state-of-the-art Large Language Models (LLMs) and Generative Text/Multimodal AI models.
• Build, optimize, and evaluate advanced LLM applications, including RAG (Retrieval-Augmented Generation), AI Agents, and workflow automation systems.
• Design, pre-train, fine-tune (SFT, LoRA/QLoRA), and align (RLHF/DPO) open-source LLMs for domain-specific tasks.
• Optimize model latency, throughput, and inference cost using modern frameworks and techniques.
• Read research papers, experiment with new methods (Prompt Engineering, Context Extension, Function Calling), and apply them to practical AI products.
• Collaborate with backend and product engineering teams to integrate LLM pipelines into scalable production systems.
• Monitor model safety, hallucinations, performance, and continuously improve model quality.

WHAT WE'RE LOOKING FOR:

• Strong foundation in Machine Learning, Deep Learning, and Natural Language Processing (NLP).
• Solid understanding of Transformer architectures, Attention mechanisms, and modern LLM paradigms.
• Hands-on experience working with LLMs (commercial APIs like OpenAI/Anthropic or open-source models like Llama/Qwen).
• Practical experience in building RAG architectures , Vector Databases (e.g., Milvus, Qdrant, Pinecone), or AI Agent frameworks (e.g., LangChain, LlamaIndex, AutoGen/CrewAI).
• Ability to read and implement research papers and technical documentation effectively.
• Strong problem-solving skills, clean coding practices, and a proactive engineering mindset.
• Ability to work independently and collaborate effectively with a multi-disciplinary team.

Nice to have:

• Experience in fine-tuning LLMs (LoRA, QLoRA, DeepSpeed, Unsloth, PEFT).
• Experience with LLM inference optimization engines (e.g., vLLM, TensorRT-LLM, Ollama, TGI) and techniques (Quantization, Speculative Decoding).

THE BENEFITS & PERKS

1. Competitive Compensation & Comprehensive Benefits

• Competitive salary package, up to 40M VND/month
• Attractive project bonus for outstanding contributions and successful project delivery.
• 13th-month salary and full benefits in accordance with Vietnamese labor law
• Annual leave, social insurance, health insurance and other statutory benefits
• Regular salary review twice a year.

2. Flexible & Modern Working

• Monday–Friday , with flexible check-in time from 08:00–10:00
• 1 WFH day/week
• Focus on results, ownership, and sustainable work-life balance

3. Work on Challenging AI Projects

• Work on diverse, challenging, and high-impact AI projects
• Directly tackle real-world problems across LLM, Generative AI, AI Agents, RAG and AI infrastructure
• Work with large-scale GPU infrastructure and modern AI frameworks
• Freedom to experiment, research, and turn ideas into production-ready products

4. High Ownership & Direct Impact

• Join a small, highly technical team with a high level of autonomy
• Work directly with the CEO and core technical team
• Take ownership of meaningful problems and see your work go from idea to production
• Fast decision-making, minimal bureaucracy, and plenty of room to make an impact

5. Premium AI Tools & Resources

• Unlimited access to Claude Max and Codex
• Access to large-scale GPU infrastructure for research, experimentation, and model development
• Premium technical resources and the latest AI tools to accelerate your work

To apply, send your resume and a short note about what you've built to hr@wigin.ai or Contact 035.602.1236 (Ms.Thu Trang)