【Fukuoka / Miyagi / Hokkaido | Product Development】Global Full-Stack Engineer | Hybrid Work

★ 【Product Development】Global Full-Stack Engineer | Security x Generative AI

• Japanese: Business Level Required

★Location: Fukuoka / Miyagi / Hokkaido

★Start-up Company

★Flextime & Hybrid Work

★In-house Service

★Annual salary: 6 million yen - 10 million yen

-------------【About the company】-------------

Based on the philosophy of “creating a society that does not have to worry about cyber security,” the company is engaged in the security business, including various vulnerability assessments, and the system development business.

In system development, it is important not only to diagnose vulnerabilities after development, but also to design with security in mind from the design stage, and to conduct security checks during the development process.

-------------【 Job Description】-------------

▼Responsibilities

The company is seeking a hands-on engineer to drive development during the global expansion phase of its proprietary SaaS platform. In this role, the candidate will co-create the core pillars of the product, including generative AI utilization log aggregation and analysis infrastructure, visualization dashboards, and security detection functionalities.

Design and implementation of AI Monitoring’s backend and frontend (primarily using Go, Python, and TypeScript)

Implementation of a platform for collecting and analyzing generative AI usage logs, as well as visualization dashboards

Development of security features such as prompt detection and anomaly detection

Implementation of integrations with various generative AI services (ChatGPT, Microsoft Copilot, Gemini, etc.)

API design, database design, and architecture design and improvement

Design, deployment, and operation of cloud infrastructure using AWS

Code reviews, quality improvement, and refinement of development practices within the team

Feature development and improvement in collaboration with PMs, designers, and security experts

▼Position Highlights

・Opportunity to build a proprietary product from scratch; participating in this 0-to-1 phase offers a steep trajectory for personal and technical skill development.

・Go beyond purely technical execution—sharpen a diverse range of competencies including project management, stakeholder communication, and organizational leadership.

・Directly contribute to building innovative security solutions essential for the Generative AI era, ensuring continuous opportunities to learn, experiment, and implement the absolute latest technologies.

▼Skills & Experience You Will Gain

・By collaborating closely with stakeholders across various roles while driving both business growth and technical initiatives, the candidate will develop a highly versatile, multi-dimensional worldview.

・As a position that entails frequent, direct alignment with the executive management layer, this role naturally cultivates long-term strategic thinking from a corporate governance perspective.

Development Environment

Programming Languages: Go, TypeScript

Frameworks: Go (Clean Architecture / Gin), Next.js, React

Testing: Go testing, Jest, Playwright (E2E), Chromatic (visual)

Infrastructure & Middleware: AWS (ECS/Fargate, RDS, Cognito, S3, CloudWatch), PostgreSQL, Redis, Docker, Nginx

CI/CD: GitHub Actions, AWS CodeBuild

Tools: GitHub, Teams, Terraform, Terragrunt, AWS CDK, Dependabot

AI Tools: GitHub Copilot, Google Gemini, Claude (Claude Code / Cowork)

-------------【 Requirements】-------------

■Required

3+ years of experience developing web applications using Go, Python, or TypeScript

Experience with source code management and code reviews in a team environment using Git/GitHub

Experience with development, deployment, and operations in cloud environments (e.g., AWS)

▼Language

Business-level English proficiency (sufficient to collaborate with overseas clients and teams)

■Preferred

Experience developing and operating applications that utilize generative AI and large language models (LLMs)

Experience developing products related to data infrastructure, log analysis, and visualization

Basic knowledge of security (including threat detection, vulnerabilities, and attack methods) and relevant training

Experience with design using GraphQL, gRPC, or JSON-RPC, as well as database design

Experience designing, building, and operating systems in an AWS environment (Lambda, ECS, CloudWatch, etc.)

Experience developing products in a small team during the startup phase

■Ideal Applicants

Calmly and flexibly derive solutions for complex specifications and areas with a high degree of uncertainty

Possess interest in and a desire to continuously learn about new technological fields, such as security and AI

Produce results while collaborating with team members, even in remote or global environments

Treat the product as “your own” and approach it with a sense of ownership

Within a small team, take an interest not only in technology but also in improving processes and culture

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【Working Time 】

Flextime System

【 Welfare 】

• Full social insurance (employment, workers' accident compensation, health, and employee pension)
• Defined Contribution Pension

【 Holiday 】

• 2 days a week (Saturday and Sunday)
• National Holidays
• New Year holiday
• Annual Paid Leave
• Parental Leave
• Special Paid Leave
• Congratulations & Condolence Leave
• Bereavement Leave

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