10/21/2025 updated
100 % available
Full-Stack Mobile Developer - Web | Mobile | Desktop App
Tokyo, Japan
Only remote
Master's in Software EngineeringAbout me
I’m Riku Sato — a freelance full-stack developer from Japan passionate about crafting digital products that combine clean logic, pixel-perfect design, and reliable performance. I specialize in Flutter, React, React Native, and Node.js, helping startups and businesses turn their ideas into success.
User Experience (UX)Application Programming Interfaces (APIs)Agile MethodologySoftware ApplicationsDatabasesE-CommerceUser Interface DesignHealth CarePush TechnologyMobile Application SoftwareNode.jsSocial MediaSystems IntegrationManaging Client ExpectationsGoogle Firebase
Freelance | Jan 2019 - Present Full-Stack Mobile Developer
• As a Full-Stack Mobile Developer in a freelance capacity, I have been instrumental in the design
and development of cross-platform mobile applications.
• Built scalable backends using Node.js and Firebase, integrating APIs and real-time databases.
• Delivered user-friendly applications tailored to industries such as e-commerce, healthcare, and
social networking.
• Proven track record of providing top-notch mobile app solutions exceeding client expectations.
• Significantly contributed to the growth and success of multiple client organizations.
TechForward Solutions | Jan 2017 - Dec 2018 Mobile Application Developer
• Created high-quality Android and iOS apps following agile methodologies.
• Implemented payment solutions, push notifications, and third-party API integrations.
• Executed seamless UI/UX designs for intuitive user experiences.
• Optimized performance, reducing crash rates by over 30%.
SmartApps Studio | Jan 2015 - Dec 2016 Junior Developer
• Developed mobile applications and web dashboards to enhance user experience.
• Collaborated on backend systems and REST API integration.
• Managed databases and implemented authentication systems.
• Deployed apps ensuring performance and reliability
Experience
Professional experience10+ years
Freelancer since2010
Languages
EnglishFluent
Project history
Design und Entwicklung von Cross-Platform Mobile Applications, Backend-Entwicklung mit Node.js und Firebase, API-Integration und Real-Time Datenbanken für E-Commerce, Healthcare und Social Networking
Entwicklung von Android und iOS Apps mit agilen Methodologien, Payment-Lösungen, Push-Notifications und Third-Party API-Integrationen, UI/UX Design und Performance-Optimierung
Entwicklung von Mobile Applications und Web Dashboards, Backend-Systeme und REST API Integration, Datenbank-Management und Authentifizierungssysteme, App-Deployment