Senior Fullstack Engineer (AI, RAG & Automation)

Employment Type: Full-timeDepartment: AI Solutions & Product Engineering
Position Overview

We are seeking an innovative Senior Fullstack Engineer (AI) to lead the charge in building, optimizing, and scaling our next-generation AI systems. In this role, you will bridge the gap between robust web architectures and bleeding-edge AI capabilities.

We are looking for a developer who doesn't just write code but is highly passionate about researching new products and translating emerging AI trends into concrete business solutions.

To succeed in this role, you must have a solid fullstack foundation, proven experience deploying practical AI systems (either through RAG or AI Automation Workflows) in live production environments, and a deep familiarity with the quality and delivery expectations of Japanese projects or companies.

Key Responsibilities

·        Architect, deploy, and maintain end-to-end AI applications, leveraging either RAG architectures or complex multi-agent automation workflows.

·        Build high-performance, secure backend services (e.g., Python/FastAPI, Node.js) and clean, intuitive frontends (e.g., React, Next.js).

·        Actively research, benchmark, and prototype new AI models, developer tools, and automation frameworks to keep our product suite ahead of the curve.

·        Work closely with product stakeholders and engineering teams to ensure that deliverables meet the rigorous quality standards typical of Japanese clients and businesses.

·        Seamlessly integrate third-party APIs, vector databases, LLM orchestration platforms, and workflow automation engines.

Required Qualifications

·        At least 4 years of professional experience in Fullstack software development.

·        At least 1 year in one of the following:

o   RAG (Retrieval-Augmented Generation): Experience building live RAG pipelines utilizing vector databases (e.g., Pgvector, Pinecone, Qdrant) and orchestration frameworks (e.g., n8n, LangChain, LlamaIndex).

o   AI Automation Workflows: Experience designing and deploying autonomous AI agents, multi-agent workflows, or complex LLM-driven automation (using tools like n8n, Langflow, Flowise, or custom crew/agent frameworks).

·        Proven experience working within a Japanese company or delivering projects for Japanese clients. You are comfortable with the detail-oriented, systematic, and high-quality expectations of the Japanese business ecosystem.

·        You love tracking AI developments, reading research papers, and tinkering with new open-source tools. You are excited to recommend and build proof-of-concepts (POCs) for fresh product ideas.