Dream. Build. Achieve!
Biography
Hi, I'm Ethan Okawa, a full-stack developer with a passion for creating beautiful, functional, and user-centered digital experiences. With 10+ years of experience in the field. I am always looking for new and innovative ways to bring my clients' visions to life.
I believe that design is about more than just making things look pretty – it's about solving problems and creating intuitive, enjoyable experiences for users.
Whether I'm working on a website, mobile app, or other digital product, I bring my commitment to design excellence and user-centered thinking to every project I work on. I look forward to the opportunity to bring my skills and passion to your next project.
80+Satisfied Clients
100+Projects Completed
10+Years Of Experience
Skills
Fluency in Front-End Technologies and Frameworks
Proficiency in Back-End Technologies and Frameworks
Database Management Skills
Proficiency in Version Control Systems
API Development and Integration
DevOps Expertise
Cybersecurity skills
Problem-Solving & Analytical Skills
Project Management Skills
Experience
Freelance Full Stack Developer @Self-Employed / Upwork
February 2025 – December 2025 | Remote- Delivered end-to-end solutions for SaaS platforms, blockchain applications, AI chatbot systems, and custom web applications.
- Designed and developed scalable frontend and backend features, including responsive interfaces, business logic, database structures, and secure API-driven functionality.
- Built and integrated RESTful APIs and connected third-party services such as payment gateways, WhatsApp platforms, authentication systems, CRM tools, and other external business services.
- Developed chatbot and automation solutions to improve customer support, lead management, and communication workflows for client projects.
- Optimized application architecture, database queries, and overall system performance to improve scalability, reliability, and user experience.
- Diagnosed and resolved bugs, handled production issues, and supported testing, deployment, and post-launch maintenance.
- Collaborated directly with clients to understand requirements, propose technical solutions, and deliver reliable products aligned with business goals.
Senior Full Stack Developer @Habitat
February 2023 – January 2025 | Tokyo, Japan- Developed and maintained a SaaS platform as a Full Stack Developer, delivering scalable and reliable web application features across both frontend and backend.
- Designed and implemented user-facing interfaces, backend services, and database-driven functionality to support core product operations and improve the overall user experience.
- Built chatbot systems and WhatsApp automation workflows to streamline customer communication, automate repetitive business processes, and enhance response efficiency.
- Integrated payment gateways and multiple third-party APIs, including messaging, authentication, notification, and external business service providers, ensuring secure and seamless data exchange across the platform.
- Designed, developed, and consumed RESTful APIs to connect internal and external systems and support feature expansion across the platform.
- Improved database queries, application architecture, and overall system performance to increase scalability, stability, and maintainability.
- Diagnosed and resolved bugs, handled production support and troubleshooting, and contributed to reliable day-to-day platform operations.
- Collaborated closely with cross-functional teams to deliver new features, enhance existing functionality, and support ongoing product growth.
Senior Full Stack Developer @Cybozu
July 2019 – November 2022 | Chuo-ku, Tokyo, Japan- Developed and maintained full-stack web applications using C#, .NET, Angular, TypeScript, and SQL Server.
- Built and integrated RESTful APIs to support frontend features, internal tools, and third-party services.
- Designed scalable backend architecture, improved database queries, and optimized application performance.
- Collaborated with product, design, and QA teams to deliver new features, fix bugs, and improve user experience.
- Implemented authentication, role-based access control, and secure coding practices across the platform.
- Wrote reusable frontend components, added unit/integration tests, and supported CI/CD deployment workflows.
- Monitored production issues, performed troubleshooting, and delivered stable releases in an agile environment.
Education
Master of Business Administration
2020 | Graduate School of Management, GLOBIS University • Tokyo, JapanStrategy, Marketing, Finance, Leadership, Entrepreneurship.
Bachelor's degree — Minor in Computer Science
2018 | Waseda University • Shinjuku, TokyoACM/IEEE student member, Programming/Developer Club.