Full Stack Assistant Manager

Appealing Points:

• Opportunity to work on cutting-edge AI/LLM technologies, designing and building scalable AI agents and automation solutions
• Gain full-stack development exposure, from backend APIs to frontend interfaces and automation pipelines
• Enhance both technical expertise and leadership skills through collaboration, code reviews, and mentoring in an agile environment

Annual salary : 8 Million yen and above

Job Responsibilities:

• AI Agent Development: Design, develop, and maintain scalable AI agents for workflow automation. Implement agent logic, including prompt design, tool usage, and response handling, while ensuring reliability and performance.
• Full-Stack Integration: Integrate LLMs into applications using Python, JavaScript, TypeScript, or Java. Build backend services, APIs, and automation pipelines. Craft intuitive, responsive user interfaces using modern frameworks (e.g., React, Remix, Angular, Vue.js).
• Testing & Quality Assurance: Test AI outputs for accuracy, consistency, and edge cases. Debug AI workflows, resolve integration issues, and continuously improve system quality through feedback loops.
• Cross-functional Collaboration: Partner with product managers, designers, QA, and DevOps teams to gather requirements, ensure alignment, and deliver high-impact features.
• Code Excellence & Mentorship: Write clean, efficient, and reusable code. Conduct thorough code reviews and provide mentorship to junior engineers to foster a culture of continuous learning.
• Innovation & Security: Stay abreast of the latest AI/LLM trends and proactively apply them. Implement robust security measures to ensure data protection and industry compliance.

Job Qualifications:

• Education: Bachelor’s degree in Computer Science, Engineering, AI, ML, or a related field (or equivalent work experience).
• Experience: 7+ years of progressive experience in programming (Python, Java, Kotlin, or Node.js) with a strong background in designing/maintaining REST APIs and microservices.
• Frontend Proficiency: Strong command of HTML, CSS, and modern JavaScript (ES6+). Experience with frameworks like React (Remix), Angular, or Vue.js, and state management libraries (e.g., Redux, MobX).
• AI/LLM Expertise: Proven experience designing and implementing scalable AI agents and automation platforms using LLMs. Solid understanding of ML, Deep Learning, and NLP fundamentals (TensorFlow, PyTorch, JAX, or Keras).
• Technical Foundations: Deep understanding of full-stack software development principles, design patterns, data structures, and algorithms.
• Soft Skills: Excellent analytical and problem-solving skills, with the ability to articulate complex technical concepts to both technical and non-technical stakeholders.
• Methodology: Experience working within Agile development environments.

Language: Conversational-level Japanese (JLPT N5) and Business-level English

About Company

The largest eCommerce company in Japan, and the third-largest eCommerce marketplace company worldwide. The organization provides a variety of consumer and business-focused services including e-commerce, e-reading, travel, banking, securities, credit card, e-money, portal and media, online marketing, and professional sports. The company is expanding globally and currently has operations throughout Asia, Western Europe, and the Americas.

[Measures against passive smoking]
No smoking indoors allowed
Designated smoking area

. Skillset Required: Python, JavaScript, TypeScript, React, JavaScript , PyTorch