Taku Yamamoto

Sr Full Stack Engineer

Upwork

Mar 2024 - Current (2 years 8 months)

• Built and scaled SaaS web applications using React, Node.js, TypeScript, and GraphQL.
• Owned features end-to-end, from API design and data modeling to pixel-perfect UI implementation. Partnered closely with product and design teams to deliver scalable client-facing capabilities and improve user experience.
• Implemented scalable microservices, RESTful APIs, and backend performance optimizations for high-traffic workloads.
• Integrated modern APIs and automation features while maintaining secure, scalable backend services.
• Collaborated asynchronously with global product and design teams in a remote-first environment. Produced technical guidance, shared implementation best practices, and supported knowledge transfer a

F

Sr Full Stack and DevOps Engineer

Favary

Feb 2021 - Feb 2024 (3 years 1 month)

• Developed full-stack applications using React, Node.js, REST APIs, and GraphQL for consumer-facing products.
• Contributed to backend architecture, service boundaries, REST API design, database performance, and scalability.
• Mentored engineers, led code reviews, and improved overall code quality and test reliability.
• Worked closely with product stakeholders to ship features iteratively with strong UX focus.
• Collaborated with QA and product teams to deliver secure, high-quality software on schedule.
• Improved CI/CD pipelines and deployment automation for reliable production releases.

Sr Full Stack Developer

Rivalry

May 2020 - Dec 2021 (1 year 8 months)

• Built interactive, high-performance web applications using React, TypeScript, Node.js, and REST APIs.
• Designed and implemented scalable RESTful backend services supporting high concurrency.
• Improved application performance and reliability through testing and CI/CD automation.
• Collaborated with designers to refine UI/UX details for user-facing flows.
• Participated in architecture discussions to improve maintainability and system scalability.
• Implemented authentication, authorization, and secure API communication across services.

i

Sr Full Stack Developer

iRidge

Apr 2017 - Jun 2019 (2 years 3 months)

• Delivered large-scale platforms serving 1M+ monthly users.
• Built modern React frontends and scalable Node.js backend services with REST API integrations.
• Introduced reusable component systems and improved frontend performance.
• Played a key role in evolving product architecture and development workflows.
• Participated in architecture discussions to improve maintainability and system scalability.
• Implemented authentication, authorization, and secure API communication across services.

A

Full Stack Developer

Alpha Telemed

Feb 2014 - Feb 2017 (3 years 1 month)

• Engineered a HIPAA-compliant telehealth platform with secure RESTful services and digital consultations.
• Built and scaled secure backend services handling sensitive patient data, SQL transactions, and appointment workflows.
• Supported 10× user growth while improving response times by 45%.
• Collaborated with clinical and operational teams to ensure reliability and compliance.
• Monitored production environments and resolved performance bottlenecks proactively.
• Developed reusable backend modules and integration services for internal and external systems.

C

Back End Developer

Creema

May 2011 - Dec 2013 (2 years 8 months)

• Contributed to Japan’s leading handmade-goods e-commerce platform, implementing high-performance backend modules in PHP / Symfony / Laravel.
• Collaborated with design and QA teams to deliver pixel-perfect UX, resolving 50+ critical issues and increasing customer satisfaction 15%.
• Optimized SQL queries and caching, cutting page-load time ~35%.
• Supported continuous improvement through user-behavior analytics and A/B testing that raised conversion rates 20%.
• Worked closely with frontend engineers to deliver reliable API integrations and seamless user experiences.
• Developed RESTful backend endpoints supporting scalable e-commerce functionality.

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Taku Yamamoto

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