Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Senior React Engineer with 10 years of experience building e-commerce frontend applications. I develop scalable, responsive UI components using React and Next.js, lead migrations to modern frameworks, and focus on performance, code quality, and maintainable architecture. I collaborate closely with design and cross-functional teams to deliver user-focused experiences, establish frontend development processes, and troubleshoot issues to keep production stable. I bring strong testing and automation practices and a performance-first mindset to every project.…Senior React Engineer with 10 years of experience building e-commerce frontend applications. I develop scalable, responsive UI components using React and Next.js, lead migrations to modern frameworks, and focus on performance, code quality, and maintainable architecture. I collaborate closely with design and cross-functional teams to deliver user-focused experiences, establish frontend development processes, and troubleshoot issues to keep production stable. I bring strong testing and automation practices and a performance-first mindset to every project.

James Muehlner

Front-End Developer, Software Engineer, Web Developer, +3





Senior React Engineer with 10 years of experience building e-commerce frontend applications. I develop scalable, responsive UI components using React and Next.js, lead migrations to modern frameworks, and focus on performance, code quality, and maintainable architecture. I collaborate closely with design and cross-functional teams to deliver user-focused experiences, establish frontend development processes, and troubleshoot issues to keep production stable. I bring strong testing and automation practices and a performance-first mindset to every project.…Senior React Engineer with 10 years of experience building e-commerce frontend applications. I develop scalable, responsive UI components using React and Next.js, lead migrations to modern frameworks, and focus on performance, code quality, and maintainable architecture. I collaborate closely with design and cross-functional teams to deliver user-focused experiences, establish frontend development processes, and troubleshoot issues to keep production stable. I bring strong testing and automation practices and a performance-first mindset to every project.

Available to hire

Senior React Engineer with 10 years of experience building e-commerce frontend applications. I develop scalable, responsive UI components using React and Next.js, lead migrations to modern frameworks, and focus on performance, code quality, and maintainable architecture.

I collaborate closely with design and cross-functional teams to deliver user-focused experiences, establish frontend development processes, and troubleshoot issues to keep production stable. I bring strong testing and automation practices and a performance-first mindset to every project.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Language

English

Advanced

Work Experience

Senior React Engineer at MAISA AI

November 1, 2024 - Present

Rebuilt an existing React web application using Next.js and Webpack, reducing load time by 24% and improving overall performance and user experience. Established a frontend development process across the team, partnering with design to standardize responsive design and UX practices. Defined technical requirements for migrating the React application to Next.js to ensure a smooth transition. Migrated the codebase to accelerate feature development, reduce bug-fix time, and improve code quality using ESLint. Overhauled a UI component library by refactoring 15 components to improve reusability and consistency. Scaled frontend infrastructure for increased traffic and worked closely with backend to support high availability across the e-commerce platform. Modernized architecture with modular design patterns, reducing latency by 200ms and improving UX, and reduced legacy technical debt by removing ~1200 lines of code. Introduced new coding standards using Prettier to improve readability, reduc

React Engineer at Sprinter Health

February 1, 2022 - November 1, 2024

Integrated and enhanced a company-wide web application using React and Next.js to improve responsiveness and page load performance across the e-commerce platform. Built and tested UI components to improve overall application quality and customer experience. Helped transition the app from a monolithic architecture toward a microservices-based system using Next.js to improve scalability and reduce load time. Refactored 12 services to reduce duplication and improve maintainability, alongside implementing coding standards and best practices. Migrated the application to Next.js, supporting a timely release and adoption of Next.js features. Implemented responsive design and UX improvements using HTML, CSS, and JavaScript to increase engagement and reduce usability complaints, improving customer satisfaction.

Frontend Engineer at Amazon

May 1, 2017 - January 1, 2022

Delivered frontend development across multiple teams, improving code quality and application performance using JavaScript and React. Modernized UI components by moving from outdated HTML to modern CSS (CSS Grid), improving load times and engagement. Shipped multiple rounds of responsive design updates to refine UX for the entire checkout flow, supporting better customer interaction and conversion. Automated testing for 10 UI components using jQuery and Jest to maintain reliable functionality and quality. Improved frontend workflow using Next.js to speed up migration and help teams focus on new features. Designed scalable frontend architecture for high-traffic e-commerce with an emphasis on UX, responsive design, and performance optimization.

Junior Software Engineer at Accenture

April 1, 2016 - April 1, 2017

Developed a responsive web application from a basic layout over six months using JavaScript, React, and CSS, partnering with design to ensure consistent UI/UX. Maintained high-quality UI components in the payments platform through regular code reviews and updates to HTML/CSS, using jQuery for DOM manipulation. Delivered a migrated e-commerce platform to Next.js, using React for the frontend and supporting the migration team by addressing layout issues and improving the UI/UX experience.