Hire the Best Firebase Developers
in Japan

I’m a Senior Full-Stack Developer from Japan with over 15 years of software development experience. My main areas are Laravel/PHP, Flutter, and full-stack web development. I work on new development, bug fixes, API integrations, performance improvements, and maintenance of existing systems. I have experience with web applications, mobile apps, internal business systems, SaaS products, reservation systems, payment-related services, and AI-powered features. My background includes enterprise banking systems at IBM Japan, large-scale business systems, mobile applications, and projects for international clients. ━━━━━━━━━━━━━━━━━━━━━━ 🛠️ Main Skills ⚡ Backend PHP / Laravel / CakePHP Ruby / Ruby on Rails Node.js / NestJS / Express REST API / Authentication / Admin Panels ⚡ Frontend React / Next.js Vue.js / Nuxt.js JavaScript / TypeScript HTML / CSS / jQuery ⚡ Mobile Flutter / Dart React Native Firebase iOS / Android ⚡ Database & Cloud MySQL / PostgreSQL Supabase / Firebase AWS / Docker / Redis ⚡ AI & API Integration OpenAI API Claude API External API Integration AI-powered features ━━━━━━━━━━━━━━━━━━━━━━ ✅ What I Can Help With • New web and mobile application development • Maintenance and improvement of existing PHP/Laravel systems • Bug fixes and performance improvements • REST API and external service integrations • Firebase and Supabase integration • Payment, notification, chat, and real-time features • App Store and Google Play release support • Japanese QA and localization for software products ━━━━━━━━━━━━━━━━━━━━━━ 🌏 Background • Over 15 years of software development experience • Former IBM Japan engineer • Founder of Monkuro Inc. • Experience working with international clients • Native Japanese speaker Some client projects are covered by confidentiality agreements, so I may not be able to share all live URLs publicly. However, I can explain my role, the features I worked on, and the technical approach. If you're looking for a reliable developer to build or improve your product, I'd be happy to help.

Hi I am Edmer, I live in Shibuya, Tokyo, with around 10 years of IT experience as a web app and mobile app Engineer, I specialize in Kotlin, Swift, Dart, Objective-C and Java Throughout my career, I’ve developed a strong track record in product design, implementation, integration testing, and bug fixing for Web, Android, iOS applications. I've had the opportunity to work on a variety of mobile applications, particularly in the E-COMMERCE space, including shopping carts and IoT applications. I’m passionate about creating user-friendly and innovative mobile solutions, and I’m excited to bring my expertise to new challenges. I have a Project Leader experience with my first IT company in Kawasaki, Kanagawa. I had experience making an app from scratch. I can help you build your app that will be modern, visually appealing and can be user friendly.

Full-Stack Developer | Nuxt.js, Next.js, Laravel, Django, FastAPI | AWS, Firebase | No-code I’m a seasoned Full-Stack Developer with expertise in building scalable web applications and backend systems using JavaScript, TypeScript, Python, PHP, and modern frameworks like React, Node.js, Laravel, Django, and FastAPI. What I deliver: • Responsive frontends using React, Next.js, Vue, and Nuxt • Scalable backends with Node.js (Express), Django, FastAPI, Flask, Laravel, and PHP • API-first architecture with REST and GraphQL • Cloud-based systems with AWS, Firebase, and Supabase • DevOps & deployment with Docker, GitHub Actions, CI/CD • Database management with PostgreSQL, MySQL, MongoDB • Automation tools, batch scripting, and backend jobs Tech Stack: JavaScript, TypeScript, Python, PHP, C#, Java, React, Next.js, Node.js, Vue, Nuxt, Express, Laravel Django, FastAPI, Flask, Docker, AWS, Firebase, Supabase, PostgreSQL, MongoDB, Bash, REST, GraphQL, Bubble.io, Softr, Airtable, Tally, Wix, Zapier, Make, DocuSign Why choose me? • Clear communication, fast turnaround, and proactive updates • Clean, well-documented, and maintainable code • Full ownership from architecture to deployment • Proven track record working with startups, agencies, and enterprise teams • Committed to delivering high-quality work that solves real business problems Whether you need a sleek frontend, a powerful backend, or an all-in-one full-stack solution — I’m here to help bring your ideas to life, on time and at scale. Let’s build something remarkable together! 🤝 keywords: JavaScript, TypeScript, Tailwind CSS, HTML, CSS, Bootstrap, React, React Native, Expo, Python, Django, FastAPI, Flask, Vue.js, Next.js, Nuxt.js, PHP, Laravel, Postman, Figma, Adaptive Web Design, User Experience Design, User Interface Design, Style Guide, Landing Page, builder.io, Design Mockup, Design Enhancement, Automation, Data Visualization, Zapier, Make, DocuSign, Airtable, Softr, Bubble.io, Tallyform, AWS, EC2, S3, Cloudfront, DynamoDB, RDS, Terraform, VPC, MySQL, PostgreSQL, MongoDB, GraphQL, ElasticSearch, PostGIS, Google Map, Foot traffic, heatmap, dashboard, analytics, C#, windows application, VPN

I specialize in backend development and DevOps, with over 10 years of experience building stable, maintainable systems. My approach is grounded in clarity, precision, and the quiet discipline of Japanese engineering values. ⚙️Backend & Fullstack Engineering I design and build modern backend systems for SaaS, eCommerce, and AI platforms. ✅ RESTful and GraphQL API development using FastAPI, Django, Express, NestJS, Ruby on Rails ✅ Microservices and event-driven architecture using Redis, Kafka, and Celery ✅ Database design and optimization (PostgreSQL, MySQL, MongoDB, ElasticSearch) ✅ Secure authentication (OAuth2, JWT, Firebase Auth) ✅ Frontend development with React, Vue, and TypeScript 🧠AI Integration & Automation I help teams integrate AI into their systems to improve productivity and automation. ✅ GPT-based agents for customer support, task orchestration, and document processing ✅ LangChain, Pinecone, Weaviate, and vector DBs for semantic search ✅ AI workflows using OpenAI, Claude, LLaMA, and Stable Diffusion ✅ NLP pipelines and intelligent scripting to reduce manual work 🛠️Cloud & DevOps (10+ yrs) I design cloud infrastructure that is secure, reliable, and cost-effective. ✅ AWS expert (Lambda, EC2, RDS, S3, CloudFront, SNS/SQS, etc.) ✅ IaC with Terraform, AWS CDK, and CloudFormation ✅ CI/CD with GitHub Actions, Docker, CodeBuild, and GitLab CI ✅ Serverless architecture and hybrid cloud solutions ✅ Multi-region deployments, IAM, encryption, and secret management What I Value 🛠 Quiet, clean engineering over flashy solutions 📏 Precision, simplicity, and structure in system design 📈 Long-term reliability and maintainability 🤝 Respectful, honest communication and careful planning I work with focus and care. Let’s build something strong, secure, and lasting together.

Hi! I'm Cyan, a software engineer based in Japan with 7+ years of professional experience. I currently work as an iOS Engineer at Mercari, where I use Claude Code daily to manage 18 parallel development sessions, automate code reviews, and ship features across a massive codebase. I don't just use Claude Code — I've built a full system around it: 35+ custom slash commands, a symlinked Obsidian knowledge vault, persistent auto-memory, scheduled agents, browser automation, and MCP integrations. I run this setup in production every day on a codebase used by millions. What I can do for you: - Claude Code setup & coaching — I'll build your CLAUDE.md rules file, custom commands, MCP integrations, and workflow automation from scratch. 1-on-1 sessions or team workshops. - Workflow design — I'll study how your team works and design a Claude Code system tailored to your stack, conventions, and pain points. - iOS development — Swift, SwiftUI, UIKit, Combine, async/await, Swift Testing, WidgetKit, Firebase, Xcode Cloud, App Store deployments. Shipped multiple apps independently + production apps at scale. - Translation & localization (JP ↔ EN) — Native-level English, professional Japanese. App/website localization, document translation, transcription, proofreading, localization QA. I live and work in Japan and use both languages daily in a professional engineering context. - Web & general dev — JavaScript, React, Firebase Hosting, Google Apps Script. Why hire me for Claude Code work: - I run 18 git worktrees with independent Claude Code agents in parallel — daily - 35+ custom slash commands that automate everything from commits to full feature implementation - A persistent knowledge vault that makes Claude smarter every session - A YouTube series documenting the entire system (live demos, not theory) - 7+ years Senior iOS at Mercari — this isn't weekend hobbyist advice, it's battle-tested at scale I'm reliable, responsive, and care a lot about quality. Whether it's a 2-hour coaching call or a full workflow buildout, I treat it like my own. Looking forward to working with you!

Fullstack TypeScript Developer | React · Next.js · NestJS · Node.js I'm a fullstack developer with 4+ years of professional development experience building production web applications end to end, from database schema and API design through to polished performant interfaces. I hold a Master's degree in Computer Science and currently lead engineering on a web-based 3D product configurator, where I own architecture, delivery, and team direction. I work in TypeScript across the entire stack, which means fewer integration surprises, shared types between client and server, and code that stays maintainable as the product grows. What I bring: FrontEnd - React and Next.js (App Router, SSR/ISR, RSC), state management with Redux Toolkit and React Query, animation with Framer Motion, and React Native for mobile. Strong focus on Core Web Vitals, code splitting, and accessibility BackEnd - NestJS and Express APIs, PostgreSQL and Redis, authentication and authorization flows, payment processing integrations, and Supabase/Firebase when speed to market matters. Infrastructure - AWS (S3, Lambda, Amplify), Docker, Kubernetes, and CI/CD pipelines. Comfortable owning deployment, not just handing off a build 3D & interactive web - Three.js/React Three Fiber, WebGL, GLSL shaders, and asset optimization for real-time rendering across desktop and mobile. This is a specialty of mine and a rare one. AI-assisted workflows - I use Claude Code, MCP integrations, and agentic tooling daily to move faster without sacrificing code quality or review discipline. Selected work: Automotive 3D configurator (Lead Engineer) - Built a browser-based configurator for premium automotive products with React and Three.js. Led a cross-functional team, defined system architecture and engineering standards, optimized rendering and asset delivery for mobile, and integrated payments and cloud services on AWS. NFT marketplace & launchpad - Delivered marketplace and launch features for a blockchain automotive platform, including wallet connectivity and digital asset workflows. Fashion e-commerce platform - Built a responsive Next.js storefront with SSR, dynamic content, and a reusable component system, with measurable gains in SEO and load performance. How I work: I ask questions before writing code, communicate proactively, and treat your codebase as something someone else will maintain. Fluent in English, Ukrainian; conversational Japanese. If you're looking for someone who can take a project from architecture to launch - or step into an existing codebase and improve it - let's talk.