Hire the Best Front-End Developers
in Japan

𝐈’𝐦 𝐚 𝐒𝐞𝐧𝐢𝐨𝐫 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 & 𝐌𝐨𝐛𝐢𝐥𝐞 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐟𝐫𝐨𝐦 𝐉𝐚𝐩𝐚𝐧 𝐰𝐢𝐭𝐡 𝟏𝟓+ 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐬𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞. I help clients build and maintain web and mobile applications, improve existing systems, fix difficult bugs, integrate APIs, and test products for the Japanese market. My strongest areas are: • PHP / Laravel backend development • React / Next.js and Vue.js frontend development • Flutter / React Native mobile development • REST API and third-party API integration • QA / manual testing / bug investigation • Japanese QA, localization, and product review I’m especially comfortable taking over existing codebases, understanding how they work, and improving them without unnecessary rewrites. ━━━━━━━━━━━━━━━━━━━━━━ 🛠️ Full-Stack Development ⚡ Backend PHP / Laravel / CakePHP Node.js / NestJS / Express Ruby / Ruby on Rails REST APIs / Authentication / Admin Systems External API Integration Shopify ⚡ Frontend React / Next.js Vue.js / Nuxt.js JavaScript / TypeScript Storybook HTML / CSS / jQuery ⚡ Database & Cloud MySQL / PostgreSQL Supabase / Firebase AWS Docker / Redis ━━━━━━━━━━━━━━━━━━━━━━ 📱 Mobile Development Flutter / Dart React Native Firebase iOS / Android App Store / Google Play release and maintenance I have experience working on production mobile applications across both the mobile and backend sides, including APIs, authentication, user-facing features, testing, and release support. ━━━━━━━━━━━━━━━━━━━━━━ 🔍 QA, Testing & Japanese Localization As a native Japanese software developer, I can support both technical QA and Japanese-language testing. • Manual testing for web and mobile applications • Functional and regression testing • Bug reproduction and investigation • Clear bug reports with steps to reproduce • Japanese UI and localization review • English-to-Japanese localization • Japanese usability and product review • iOS / Android app testing • Cross-browser and cross-device testing My software engineering background allows me to go beyond basic testing. I can investigate application behavior, understand APIs and system flows, and communicate technical issues clearly with development teams. ━━━━━━━━━━━━━━━━━━━━━━ 🤖 AI-Assisted Development I regularly use Cursor, ChatGPT, Claude, Claude Code, and Codex in my development workflow. I use AI to improve development speed, but I do not rely on generated code blindly. With 15+ years of engineering experience, I review architecture, logic, security, and maintainability before changes are released. I also have experience integrating AI APIs and AI-powered features into applications. ━━━━━━━━━━━━━━━━━━━━━━ 🌏 Background • 15+ years of professional software development experience • Former IBM Japan engineer • Experience with enterprise and mission-critical systems • Founder of Monkuro Inc. • Experience working with international clients • Native Japanese speaker My project experience includes web applications, mobile apps, SaaS products, internal business systems, reservation platforms, payment-related services, and AI-powered features. Some client projects are covered by confidentiality agreements, so I cannot publicly share every app or production URL. However, I can explain my responsibilities, the features I developed, the technologies used, and how I approached the technical challenges. If you need an experienced developer for Laravel/PHP, React, Flutter, React Native, QA/testing, or a product for the Japanese market, I’d be happy to discuss your project.

There is a Japanese saying that goes: “One who chases after two hares won’t catch even one.” I was that person in the past - trying to be the jake-of-all-trades, aka master of none. Over time, as I gained more experience and skills, I realized that it was not good enough to know many things - it was the practice and actual development experience that mattered. Software development is a huge subject, and being a jack-of-all-trades is important, not in the sense that you take any project and expect to succeed, but in the sense that you need to know what is going on in different parts of your software system even if you are not building its entirety, and that you should always keep learning and honing your skills. After graduating from one of the top computer science colleges in Japan and spending several years in high-profile software companies, the biggest thing I learned probably is the skill of learning. And the need for learning. Even for the technologies you are strong at, you will be outdated after a few weeks of not updating yourself. Of course, to be excellent at it. Lastly, I take one-at-a-time approach to doing everything. Make a commit, push the code and move on to the next thing. Don’t go about messing up things and making zero progress. The lines of code doesn’t matter - progress matters. This is my work philosophy. Currently, I mainly work on the frontend development with JavaScript frameworks such as React, Angular, Vue.js and Ember, and a bit of backend development with Node/Express, Ruby, PHP and Python/Django. Here are some of my skills: - Basics HTML/CSS/JavaScript/jQuery, ES6/ES7/ES8, TypeScript, Responsive design (Bootstrap), Git, TDD/CI, SQL/NoSQL - Frontend React (redux, redux-saga), Angular (1, 2, 4), Ember, Vue.js - Backend Node (express, sails, hapi, loopback), Ruby (rails, sinatra), PHP, Python, MongoDB, Postgres, MySQL, AWS/Firebase

I’m a Japan-based Web Developer specializing in frontend development and WordPress, with 20+ years of professional experience in commercial web production. I help businesses and agencies build, improve, and maintain responsive websites, landing pages, and WordPress sites, with a strong focus on clean implementation, accuracy, and reliable delivery. WHAT I CAN HELP YOU WITH • Frontend Development — HTML, CSS/SCSS, JavaScript, jQuery • WordPress Development & Customization • Responsive Website Development • Landing Page Development • Figma / Adobe XD / Photoshop to HTML • Website Maintenance & UI Improvements • A/B Testing Implementation • Japanese Website Localization WHY WORK WITH ME I’ve worked on 50+ landing pages and supported corporate websites across industries including finance, healthcare, real estate, travel, beauty, and B2B services. My experience goes beyond coding. I have also worked in web design and end-to-end website production, so I understand how design intent, usability, content, and frontend implementation need to work together. As a native Japanese speaker, I can also help international clients localize websites and landing pages for the Japanese market. My frontend background allows me to consider not only language, but also UI text, layout, responsiveness, and the technical structure of the website. I’m comfortable joining existing projects, working with established codebases, and collaborating remotely with designers, developers, directors, and other team members. LOOKING FOR ONGOING SUPPORT? I’m particularly interested in long-term and ongoing collaborations. If you need a reliable developer for continuous website development, WordPress work, maintenance, or Japanese localization, feel free to send me a message. Let’s discuss how I can support your project.

Senior Backend / Full-Stack Engineer | Java (Spring/Spring Boot) | Python | React | APIs | Cloud (AWS/GCP) --- I help businesses build reliable backend systems, APIs, and scalable cloud applications. I’m a backend-focused software engineer with 9+ years of experience developing enterprise systems using Java (Spring Boot), SQL, and modern cloud technologies. I have worked on large-scale platforms in logistics and financial systems where stability, performance, and maintainability are critical. In addition to backend development, I also build modern web applications and dashboards using React and JavaScript. My main strength is understanding complex systems quickly and delivering clean, reliable solutions across both backend and frontend systems. I can help with: • Backend development using Java / Spring Boot • REST API design and integration • Fixing backend bugs and improving system performance • Database design and SQL optimization (Oracle / relational databases) • Microservices architecture and system integrations • Cloud infrastructure and deployment on Google Cloud Platform • Python automation, data processing, and backend tooling • Frontend development using React and modern JavaScript frameworks • System refactoring and improving existing codebases I am comfortable joining existing projects, understanding legacy systems, and improving them step by step while maintaining stability. I focus on clear communication, reliable delivery, and building maintainable systems that scale with your business. If you need help with backend APIs, integrations, dashboards, or improving an existing system, I would be happy to discuss your project.