nidoneko Full-Stack Engineer
Building scalable web applications with modern TypeScript stack.
From frontend to cloud infrastructure.
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View My Skills →Who I Am
I'm a freelance full-stack engineer based in Japan with 8+ years of hands-on experience delivering production systems across healthcare, finance, HR, and IoT domains. I specialize in building high-quality web applications using TypeScript, React.js, Nuxt.js, and Node.js, with a strong focus on usability, performance, and maintainability.
My approach combines deep technical expertise with real-world project leadership. I've led development teams of 5-10 engineers — handling hiring, 1-on-1 mentoring, architecture decisions, and sprint planning. I'm equally comfortable building responsive frontend UIs and setting up scalable cloud infrastructure with CI/CD pipelines on AWS and GCP.
I believe in writing clean, testable code and choosing the right tools for each project. Whether it's migrating a legacy system to a modern stack, building a greenfield SaaS product, or optimizing an existing application's performance, I bring a pragmatic, results-driven mindset.
Tools I Build With
A full-stack engineer's toolkit — from frontend frameworks to cloud infrastructure.
Languages
Frameworks
Database
Cloud & Infrastructure
DevOps & CI/CD
What I Bring
Real-world engineering experience across diverse industries and technology stacks.
| Domain | Key Technologies | Scale & Impact |
|---|---|---|
| Healthcare | Node.js, PostgreSQL, AWS | 99.9% uptime, HL7/FHIR compliant |
| Finance & HR | React, Spring Boot, PostgreSQL | Thousands of daily active users |
| IoT | GCP, Firestore, WebSocket | 10,000+ connected devices |
| Team Leadership | Agile, Code Review, CI/CD | 5-10 engineer cross-functional teams |
Healthcare Systems
Developed patient management and electronic medical record systems under strict regulatory compliance requirements (HL7/FHIR standards). Built real-time data pipelines processing sensitive health information with 99.9% uptime using Node.js, PostgreSQL, and AWS. Implemented end-to-end encryption and audit trails for data integrity.
Finance & HR Platforms
Architected financial transaction systems and HR management platforms serving thousands of daily active users. Implemented secure OAuth2 authentication, granular role-based access control, and comprehensive audit logging. Built with React, Spring Boot, and PostgreSQL on AWS infrastructure with automated CI/CD pipelines.
IoT & Real-Time Apps
Built IoT device management dashboards processing data from 10,000+ connected devices with real-time monitoring and alerting. Designed event-driven architectures using WebSocket, MQTT, and message queues (SQS/SNS) for sub-second data delivery. Deployed on GCP with Firestore and Cloud Functions for auto-scaling.
Team Leadership
Led cross-functional development teams of 5-10 engineers across multiple projects. Responsible for technical hiring, 1-on-1 mentoring, architecture reviews, and agile sprint planning. Established coding standards, code review processes, and CI/CD best practices. Bridged the gap between business stakeholders and engineering execution.