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Full-Stack Engineer - AI Agent - 20M/Hybrid

Posted by Specialized Group • Japan, Japan, Japan

📍 Japan, Japan 🕒 February 28, 2026

About the Role

Our client is a Japan-based AI startup building a next-generation voice AI agent platform designed to go beyond traditional chatbots and actively drive sales. Their product is already live, monetized, and used globally, with strong early traction. We’re focused on scaling a Japanese-born AI product to the world.

You’ll be deeply involved in zero-to-one global AI product development, working closely with leadership and a small, elite engineering team based in Japan. This role offers hands-on ownership, rapid iteration, and the chance to shape the future of AI-powered sales technology in an international environmen. 

Requirements:
  • 5+ years of production software engineering experience
  • Strong experience with Ruby on Rails, along with backend experience in Go, Python, C#, etc. 
  • Fluency in Japanese is highly-preferred 
  • Comfortable owning architecture and shipping end-to-end
  • Startup mindset with interest in AI/LLM-powered produ...
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