08/12/2025 updated
JM
100 % available
Senior Full Stack Engineer with React, Next.js and Angular expertise
Pasadena, USA
Worldwide
Master of Science in Web and Application DevelopmentJavaScriptA/B TestingUser Experience (UX)Agile MethodologyAmazon Web ServicesArchitectureLAMP StackCloud ComputingDevOpsEnzymesUser Interface DesignInfrastructure ManagementPostgreSQLMongoDBNode.js
JavaScript Framework Expertise
Expertise in modern JavaScript frameworks including React, Next.js, Vue, Angular, and Redux. Skilled in building responsive, modular Single Page Applications (SPAs) and reusable UI components.
Full Stack Development
Proficient in both frontend and backend development with Node.js, Express.js, RESTful API design, MongoDB, PostgreSQL, and Ruby on Rails. Experience in implementing containerized solutions using Docker/Kubernetes.
Performance Optimization
Strong background in performance optimization, reducing latency by 40% during a major migration from LAMP to MERN stack, and boosting conversion rates by 80% through optimized UX/UI and frontend architecture.
Cloud & DevOps
Experience with cloud migration (AWS to GCP), containerization with Docker/Kubernetes, and infrastructure-as-code solutions using Terraform, resulting in reduced annual cloud costs by $260,000.
Testing & Quality Assurance
Competent in unit and integration testing using Jasmine, Jest, Enzyme, and Cypress. Experience in conducting A/B testing for UI/UX improvements and resolving usability issues proactively.
UI/UX Design Collaboration
Skilled in collaborating with designers to create efficient, technically sound UI designs with a focus on performance, achieving Lighthouse scores above 85 for performance, accessibility, and best practices.
Agile & Team Leadership
Strong background in Agile/Scrum methodologies, facilitating team transitions from waterfall to Agile, participating in sprint ceremonies, and mentoring junior developers to expand frontend skills.
Expertise in modern JavaScript frameworks including React, Next.js, Vue, Angular, and Redux. Skilled in building responsive, modular Single Page Applications (SPAs) and reusable UI components.
Full Stack Development
Proficient in both frontend and backend development with Node.js, Express.js, RESTful API design, MongoDB, PostgreSQL, and Ruby on Rails. Experience in implementing containerized solutions using Docker/Kubernetes.
Performance Optimization
Strong background in performance optimization, reducing latency by 40% during a major migration from LAMP to MERN stack, and boosting conversion rates by 80% through optimized UX/UI and frontend architecture.
Cloud & DevOps
Experience with cloud migration (AWS to GCP), containerization with Docker/Kubernetes, and infrastructure-as-code solutions using Terraform, resulting in reduced annual cloud costs by $260,000.
Testing & Quality Assurance
Competent in unit and integration testing using Jasmine, Jest, Enzyme, and Cypress. Experience in conducting A/B testing for UI/UX improvements and resolving usability issues proactively.
UI/UX Design Collaboration
Skilled in collaborating with designers to create efficient, technically sound UI designs with a focus on performance, achieving Lighthouse scores above 85 for performance, accessibility, and best practices.
Agile & Team Leadership
Strong background in Agile/Scrum methodologies, facilitating team transitions from waterfall to Agile, participating in sprint ceremonies, and mentoring junior developers to expand frontend skills.
Experience
Professional experience5 - 10 years
Freelancer since2017
Languages
EnglishFluentJapaneseGood
Project history
Led front-end and full-stack development of scalable, responsive single-page web applications using React, Angular, Node.js, and related technologies, implementing containerized solutions, optimizing UI with modern frameworks, conducting comprehensive testing, and mentoring junior developers within Agile teams.
Led payment system improvements, cloud migration, invoice processing optimization, Agile transition, and frontend training to enhance customer experience, reduce costs, and increase team efficiency. Developed modern features using React, TypeScript, and Redux, migrated from AWS to GCP, and re-architected invoice processing engine, eliminating over 125,000 hours/month of manual processing.
Delivered end-to-end client solutions as part of an agile team by developing responsive, modular websites and UI components, collaborating with designers, optimizing user interfaces, and reducing support tickets through custom dashboards. Developed applications using React, TypeScript, Redux Toolkit, and modern CSS methodologies.