Lead Full Stack Engineer

About the role

We are looking for a Lead Full Stack Engineer to build and scale an internal workflow automation platform on n8n, supporting a Japan-based pilot rollout within the Recruit domain. You’ll work across Node.js, React, PostgreSQL, and MongoDB — designing integrations, extending platform capabilities, and partnering directly with stakeholders in Japan to drive adoption. Business-level Japanese proficiency is required.

What you will do

• Build, extend, and scale our internal workflow automation platform built on top of n8n;
• Design and implement backend services and integrations to support complex automation workflows;
• Develop and maintain scalable integrations with internal services, third-party SaaS platforms, and APIs;
• Collaborate closely with stakeholders and pilot users in Japan, particularly within the Recruit domain, to ensure successful platform onboarding and adoption;
• Customize workflows and platform capabilities based on user needs and operational requirements;
• Contribute to platform architecture decisions and ensure long-term scalability and reliability;
• Provide technical leadership and best practices for automation design, system integrations, and platform stability;
• Support users by troubleshooting issues, improving platform usability, and ensuring successful adoption.

Must haves

• 5+ years of experience;
• Business-level to native Japanese proficiency, written and spoken — non-negotiable;
• Ability to communicate effectively with stakeholders and users in Japan;
• Strong experience with Node.js as a primary backend language;
• Experience building, extending, or operating automation platforms using n8n;
• Python as a secondary language for backend services, scripting, or supporting components;
• Experience with React for building modern, responsive interfaces and integrating frontend applications with backend services;
• PostgreSQL – relational database design, querying, and optimization;
• MongoDB – experience with NoSQL data modeling and document-based storage;
• Strong experience building and maintaining REST APIs;
• Experience integrating internal systems and third-party SaaS platforms;
• Experience with Docker and containerized environments;
• Strong stakeholder management and relationship-building skills;
• Comfortable working directly with users and partners to understand needs and ensure successful platform adoption;
• Ability to translate technical capabilities into practical solutions for business teams;
• Strong collaboration and communication skills in cross-functional and international environments;
• Upper-intermediate English level.

Nice to haves

• Experience designing workflow automation systems;
• Experience with SaaS integrations across multiple platforms;
• Background in platform architecture or internal developer platforms;
• Experience building internal tools or automation platforms used across multiple teams.