English summary for screening — check the original posting before applying.
Lead Full-Stack Engineer to drive new product development and growth for the overseas media (game8.co). You will collaborate with the business side to maximize product value through technology, including designing and implementing AI solutions.
Must-haves
- Web application development experience
- Experience with frameworks like Ruby on Rails
- AWS infrastructure operation and construction experience
- Experience in technology selection, architecture design, or development policy formulation for web applications
- Experience solving business challenges with technology and achieving results
- Experience integrating AI agents or LLMs into development/business flows or product features and continuously operating/improving them
Nice-to-haves
- Experience with React
- Proven track record of growing a product as an engineer
- Experience designing agent loops including task decomposition, tool use, state management, and self-evaluation
- Experience designing harness, permission management, evaluation, and monitoring infrastructure for safe and reproducible AI agent execution
- Experience developing AI applications using RAG, MCP, Agent SDK, Amazon Bedrock
Tech stack
RubyTypeScriptRuby on RailsAstroHonoMySQLRedisDockerAWSGitHub ActionsGitHubNotionGoogle DriveSlackDiscordChatGPTGitHub CopilotGemini Enterprise Agent PlatformGeminiCursorDevinClaudeAmazon Bedrock
Work style
Hybrid: 1 day onsite in Tokyo (Shibuya), 4 days remote. Japanese language required for business operations.
Other notes
Salary: 6,000,000 - 8,000,000 JPY/year (Monthly base: 500,000 - 666,800 JPY)