Senior Frontend (React) Engineer
Location: Tokyo
Department: AI App Studio – Engineering
Employment Type: Full-Time
About the Role
We are looking for a Senior Frontend Engineer to lead the development of advanced applications that harness the power of generative AI and large language models (LLMs) to solve business challenges for global brands. As part of the AI App Studio team, you will take ownership of frontend architecture for BI dashboard applications and corporate/service websites. Your leadership in frontend development, team mentoring, and technical direction will directly enhance organizational capabilities and business impact.
Key Responsibilities
Technical Leadership
Design and standardize frontend architecture using modern frameworks (e.g., React, Next.js)
Lead technical decision-making and tool selection
Conduct code reviews and mentor junior/mid-level engineers
Drive improvements in frontend performance, maintainability, and scalability
Development Lead
Architect and lead the development of BI dashboard applications
Collaborate on backend API development and optimization using Python, Node.js
Design and implement ETL pipelines and data processing workflows
Build and maintain corporate and service websites
DevOps & Infrastructure
Design, build, and automate CI/CD pipelines
Practice Infrastructure as Code (IaC) using Terraform
Optimize cloud infrastructure costs and ensure scalability
Apply and promote security best practices throughout the stack
Required Qualifications
3+ years of experience developing frontend applications using React/Next.js
Deep experience with TypeScript
and type-safe programming practices
Experience designing and optimizing infrastructure with AWS/GCP
Strong knowledge of Git flow, team-based development, and code review practices
Native-level fluency in Japanese
Preferred Qualifications
Proven experience leading teams of 3+ engineers
Prior experience as a Tech Lead
or Architect
Backend development experience using Python
or Node.js
Hands-on experience with ETL, data pipelines, and tools like BigQuery
or Redshift
Proficiency with SQL
for data analysis and query optimization
Experience managing infrastructure using Terraform
UI/UX design collaboration using tools like Figma
Development of AI/ML-powered features
English communication skills for working with global team members
Tech Stack & Tools
Languages:
TypeScript, Python, PHP
Frameworks/CMS:
React, Next.js, WordPress
Cloud/Infra:
GCP (Cloud Run, Cloud SQL), AWS, Vercel
Source Control:
BitBucket, GitHub
Communication:
Slack
Project Management:
JIRA (Agile Board)
Documentation:
Confluence
Benefits
Annual bonus
Biannual performance reviews
Commuting allowance
Full 5-day workweek + public holidays + New Year break
Paid vacation
Special leave (marriage, childbirth, bereavement)
Parental leave
Social insurance: health, pension, employment, and workers’ compensation
Working hours:
10:00 AM – 7:00 PM