Full Stack Engineer

Full-Stack Engineer (AI Platform)

Location: Tokyo, Japan (Remote/Hybrid Available)

Salary: ¥6,000,000 – ¥15,000,000/year

Japanese Level: Advanced

Open for applicants who is currently residing in Japan with valid working visa for non-Japanese citizen

About the Company

Join a fast-growing AI startup that's transforming the way AI models are built through an innovative AI data platform. The company provides end-to-end solutions for AI data collection, annotation, and management, helping enterprises develop high-quality AI models faster and more efficiently.

Their platform supports technologies such as AI-OCR, object detection, Large Language Models (LLMs), and other cutting-edge AI applications. With clients ranging from major Japanese enterprises to international organizations, the company is rapidly expanding across Japan, Southeast Asia, Africa, and Europe.

If you're passionate about AI, cloud technologies, and building products with real-world impact, this is an excellent opportunity to work on meaningful projects in a fast-paced startup environment.

What You'll Do

As a Full-Stack Engineer, you'll take ownership of developing and enhancing the company's AI data platform across the entire technology stack.

Your responsibilities include:

• Develop and maintain web and mobile application features
• Design and build scalable backend APIs and database architecture
• Design, deploy, and optimize cloud infrastructure
• Improve the UI/UX of AI annotation and data collection tools
• Build and maintain DevOps/MLOps environments and CI/CD pipelines
• Collaborate closely with Product, Business, and Engineering teams to deliver high-quality solutions

Tech Stack:

Backend

• Python (Django)
• Node.js

Frontend

• TypeScript
• React
• Next.js
• React Native

Database

• PostgreSQL

Cloud & Infrastructure

• AWS
• Google Cloud Platform (GCP)
• Docker
• Kubernetes
• GitHub Actions

AI Technologies

• Google Vertex AI
• AWS SageMaker
• LLM & AI integration

Required Qualifications:

• Practical experience in web application development
• Development experience using languages such as Python, Node.js, or TypeScript
• Experience in designing and operating relational databases (e.g., PostgreSQL)
• Experience developing and operating applications in cloud environments such as AWS or GCP

Nice-to-have:

Candidates must meet the following criteria:

• Experience developing services that utilize large-scale models such as LLMs or VLMs
• Experience with modern frontend development using React, Next.js, or React Native
• Development experience in containerized environments using Docker and Kubernetes
• Experience in building systems that support multilingual content and handle image/video data processing
• Experience in building and operating data pipelines or MLOps infrastructure

Ideal Candidate

• End-to-end experience in AI data infrastructure, from design and scaling to continuous optimization.
• Hands-on experience addressing failures and driving improvements for AI products in real-world production.
• Growth opportunities in a role with ownership over technical decision-making.
• A clear career path toward becoming a future Tech Lead or Architect.

We have more positions available—if you're open to new opportunities, don’t hesitate to apply!

Job ID: 06511