Research Scientist (Generative & Agentic AI) - Tokyo,Japan.

The role

You will research and build agentic AI systems including reasoning, planning, and multi-agent collaboration. You will advance post-training techniques and improve foundation model performance to turn research into product impact.

What you will do

• Research and build agentic AI systems powered by LLMs and VLMs.
• Advance post-training techniques to improve model capability, alignment, and reliability.
• Improve performance, efficiency, and scalability of foundation models.
• Design rigorous evaluations and benchmarks for models and agents.
• Collaborate with cross-functional teams to ship research into production applications.
• Track frontier research and publish findings at leading AI/ML venues.

Required qualifications

• Master's degree or Ph.D. in Computer Science, Electrical Engineering, Mathematics, or a related field, with research experience in AI/ML.
• Deep understanding of modern foundation models, with expertise in at least one of: LLMs, VLMs/multimodal models, RL, or agentic systems.
• Hands-on experience building with LLMs: fine-tuning, RAG, agent frameworks (e.g., tool use, function calling), or product prototyping.
• Proficient in Python and PyTorch.
• Strong ability to analyze model behavior, diagnose bottlenecks, and improve training and inference pipelines.
• Clear communication skills.
• Team-first attitude in a fast-paced, collaborative environment.

Nice to have

• Fluency with AI-assisted coding workflows
• Publications in top AI/ML conferences (e.g., NeurIPS, ICML, ICLR, CVPR, ACL, EMNLP)
• Experience with large-scale distributed training or LLM post-training pipelines
• Contributions to open-source projects (e.g., agent frameworks, model or benchmark releases)
• Passion for pushing the frontier of generative and agentic AI and bridging research with impactful real-world applications

Before you apply

• Appier's Japan office provides visa sponsorship to international candidates.

About the company

Appier is an AI-native Agentic AI as a Service (AaaS) company that uses artificial intelligence to power business decision-making. It is listed on the Tokyo Stock Exchange.