Available to hire
Hello! I’m Randy Caballero, a React and Next.js developer with over 5 years of experience building high-performance, scalable web applications. I’ve freelanced for diverse clients, delivering full-cycle solutions focused on speed, resource optimization, accessibility, and outstanding user experience. I specialize in modern frontend development with React and Next.js, and I have hands-on experience integrating RESTful APIs, working with PostgreSQL databases, and managing state with Zustand. I also bring knowledge in digital marketing and WordPress to align technical execution with business goals and user engagement.
My professional journey includes roles at Atser Systems Inc., Revature, and Empresa Agropecuaria de Camaguey, where I contributed to full-stack development in collaborative Agile environments. I thrive in cross-functional teams, designing accessible interfaces, optimizing performance across browsers, and delivering maintainable code. I stay current with industry trends and best practices, and I enjoy building polished, scalable solutions that drive impact for users and businesses.
Skills
Language
Spanish; Castilian
Fluent
English
Fluent
Work Experience
Freelance Web Developer at Self-Employed
September 1, 2022 - PresentWorked directly with clients to gather project requirements and define objectives aligned with business goals. Designed and developed modern, user-focused responsive websites emphasizing functionality, usability, and visual consistency. Delivered maintainable code using HTML, CSS, JavaScript, and React. Integrated third-party APIs and plugins to broaden website capabilities. Ensured performance optimization, SEO, accessibility compliance, and provided continuous maintenance and technical support.
Software Developer at Revature
April 1, 2022 - September 1, 2022Wrote and maintained clean, functional code to enhance website features and functionality. Collaborated with senior developers to troubleshoot bugs and improve system stability. Applied web development best practices, integrated third-party APIs, conducted code reviews for quality assurance, and performed cross-browser/device testing to ensure consistency. Supported routine website updates and kept informed on emerging frontend technologies. Maintained technical documentation of requirements and workflows.
Software Developer at Atser, Systems. Inc
April 30, 2025 - July 20, 2025Developed and implemented responsive web applications using Next.js, Tailwind CSS, and ShadCN UI, enhancing user experience across devices. Successfully integrated RESTful APIs built with C#, ensuring smooth data flow and consistent system functionality. Collaborated in cross-functional teams within an Agile environment, actively participating in daily Scrum meetings and sprint planning using Jira. Designed accessible, user-centric interfaces tailored to project specifications and end-user feedback. Connected the frontend with PostgreSQL databases to render and manage dynamic content efficiently. Contributed to code reviews, applying best practices in version control, performance optimization, and responsive design. Identified and resolved UI/UX issues, significantly improving usability and performance across multiple browsers and devices.
Freelance Web Developer
September 1, 2022 - PresentMet with clients to gather project requirements and define clear objectives, ensuring alignment with business goals. Designed and developed modern, user-focused websites with an emphasis on functionality, usability, and visual consistency. Built fully responsive layouts adaptable to various devices and screen sizes, enhancing mobile and cross-platform performance. Delivered clean, maintainable code using technologies like HTML, CSS, JavaScript, and React, ensuring scalability and maintainability. Integrated third-party APIs and plugins (e.g., maps, payment gateways, forms) to expand functionality and user interaction. Performed thorough testing and debugging to ensure smooth website operation and a bug-free user experience. Optimized websites for performance, loading speed, and SEO, improving visibility and user retention. Ensured compliance with web standards, accessibility (WCAG), and basic security protocols, increasing reliability and trust. Provided continuous maintenance and tech
Software Developer at Revature
September 30, 2022 - July 20, 2025Wrote and maintained clean, functional code to support new website features and enhance existing functionalities. Collaborated with senior developers to troubleshoot bugs, implement fixes, and improve system stability. Applied modern web development best practices, contributing to cleaner, more maintainable codebases. Assisted in the integration of third-party APIs and services, improving website capabilities and user experience. Participated in code reviews to ensure code quality, readability, and adherence to team standards. Conducted cross-browser and cross-device testing to identify and resolve compatibility issues, ensuring consistent behavior across platforms. Supported routine website updates and content changes to meet evolving client or business needs. Proactively stayed informed on emerging trends and technologies in frontend development, contributing to ongoing innovation. Helped maintain technical documentation for project requirements, workflows, and code references.
Software Developer at Atser Systems Inc
April 30, 2025 - July 26, 2025Developed and implemented responsive web applications using Next.js, Tailwind CSS, and ShadCN UI to enhance user experience across devices. Integrated RESTful APIs built with C# to ensure smooth data flow and system functionality. Collaborated in Agile teams, participating in Scrum meetings and sprint planning using Jira. Designed accessible, user-centric interfaces and connected frontend with PostgreSQL databases. Contributed to code reviews and optimized performance and responsive design. Identified and resolved UI/UX issues, improving usability and performance across multiple browsers and devices.
Freelance Web Developer
September 1, 2022 - PresentMet with clients to gather project requirements and define clear objectives aligned with business goals. Designed and developed modern, user-focused websites emphasizing functionality, usability, and visual consistency. Built fully responsive layouts adaptable to various devices and ensured cross-platform performance. Delivered clean, maintainable code using HTML, CSS, JavaScript, and React. Integrated third-party APIs and plugins to expand functionality. Performed testing and debugging for bug-free operation. Optimized websites for performance, speed, and SEO while ensuring web standards compliance and accessibility. Provided ongoing maintenance and technical support.
Software Developer at Atser Systems Inc.
April 1, 2025 - October 3, 2025Developed and implemented responsive web applications using Next.js, Tailwind CSS, and ShadCN UI, enhancing user experience across devices. Integrated RESTful APIs built with C#, ensuring smooth data flow and consistent system functionality. Collaborated in cross-functional teams within an Agile environment, actively participating in daily Scrum meetings and sprint planning using Jira. Designed accessible, user-centric interfaces tailored to project specifications and end-user feedback. Connected the frontend with PostgreSQL databases to render and manage dynamic content efficiently. Contributed to code reviews, applying best practices in version control, performance optimization, and responsive design. Identified and resolved UI/UX issues, significantly improving usability and performance across multiple browsers and devices.
Freelance Web Developer at Self-Employed
September 1, 2022 - PresentMet with clients to gather project requirements and define clear objectives, ensuring alignment with business goals. Designed and developed modern, user-focused websites with emphasis on functionality, usability, and visual consistency. Built fully responsive layouts adaptable to various devices and screen sizes. Delivered clean, maintainable code using HTML, CSS, JavaScript, React, Next.js, Node.js, and Express, ensuring scalability and maintainability. Developed RESTful APIs and backend services with Node.js and Express, integrating with PostgreSQL and Supabase for data persistence, authentication, and RBAC. Integrated third-party APIs and plugins to expand functionality. Performed thorough testing and debugging across both frontend and backend, ensuring smooth operation and bug-free UX. Optimized websites and APIs for performance, loading speed, and SEO. Ensured compliance with web standards, accessibility (WCAG), and security best practices (HTTPS, JWT, input validation). Provided
Software Developer at Revature
September 1, 2022 - October 3, 2025Wrote and maintained clean, functional code to support new website features and enhance existing functionalities. Collaborated with senior developers to troubleshoot bugs, implement fixes, and improve system stability. Applied modern web development best practices, contributing to cleaner, more maintainable codebases. Assisted in the integration of third-party APIs and services, improving website capabilities and user experience. Participated in code reviews to ensure code quality, readability, and adherence to team standards. Conducted cross-browser and cross-device testing to identify and resolve compatibility issues, ensuring consistent behavior across platforms. Supported routine website updates and content changes to meet evolving client or business needs. Proactively stayed informed on emerging trends and technologies in frontend development, contributing to ongoing innovation. Helped maintain technical documentation for project requirements, workflows, and code references.
Frontend Developer at Empresa Agropecuaria de Camaguey
February 1, 2022 - October 3, 2025Developed interactive and responsive user interfaces using React.js, JavaScript, and CSS. Optimized application performance through code splitting, memoization, and efficient component rendering. Created reusable and modular components to maintain clean and scalable code. Implemented global state management with Redux or Context API to ensure data consistency. Integrated REST APIs and WebSockets to display dynamic, real-time data. Debugged and resolved issues using React DevTools and Chrome DevTools. Designed navigation flows with React Router to enhance user experience. Wrote unit and integration tests using Jest and React Testing Library to ensure code quality.
Software Developer at Atser Systems Inc.
April 1, 2025 - October 3, 2025Developed and implemented responsive web applications using Next.js, Tailwind CSS, and ShadCN UI; integrated RESTful APIs built with C#; collaborated in Agile environments with Jira; designed accessible, user-centric interfaces; connected frontend with PostgreSQL; contributed to code reviews and performance optimization.
Freelance Web Developer at Self-Employed
September 1, 2022 - PresentMet with clients to gather requirements, designed modern, responsive websites, and delivered clean, maintainable code using HTML, CSS, JavaScript, React, Next.js, Node.js, and Express; developed RESTful APIs and backend services with PostgreSQL and Supabase; integrated third-party APIs and plugins; performed thorough testing and optimization.
Software Developer at Revature
September 1, 2022 - October 3, 2025Wrote and maintained clean, functional code to support new website features; collaborated with senior developers to troubleshoot bugs and improve stability; applied modern web development practices to produce maintainable codebases; assisted in API integration and cross-browser compatibility testing.
Frontend Developer at Empresa Agropecuaria de Camaguey
February 1, 2022 - October 3, 2025Developed interactive and responsive user interfaces with React.js; optimized performance; created reusable components; implemented global state management; integrated REST APIs and WebSockets for real-time data; conducted testing and debugging to ensure a smooth user experience.
Software Developer at Atser Systems Inc.
April 30, 2025 - October 3, 2025Developed and implemented responsive web applications using Next.js, Tailwind CSS, and ShadCN UI, enhancing user experience across devices. Successfully integrated RESTful APIs built with C#, ensuring smooth data flow and consistent system functionality. Collaborated in cross-functional teams within an Agile environment, actively participating in daily Scrum meetings and sprint planning using Jira. Designed accessible, user-centric interfaces tailored to project specifications and end-user feedback. Connected the frontend with PostgreSQL databases to render and manage dynamic content efficiently. Contributed to code reviews, applying best practices in version control, performance optimization, and responsive design. Identified and resolved UI/UX issues, significantly improving usability and performance across multiple browsers and devices.
Freelance Web Developer at Self-Employed / Freelance
September 1, 2022 - PresentMet with clients to gather project requirements and define clear objectives, ensuring alignment with business goals. Designed and developed modern, user-focused websites with an emphasis on functionality, usability, and visual consistency. Built fully responsive layouts adaptable to various devices and screen sizes, enhancing mobile and cross-platform performance. Delivered clean, maintainable code using HTML, CSS, JavaScript, React, Next.js, Node.js, and Express, ensuring scalability and maintainability. Developed RESTful APIs and backend services with Node.js and Express, integrating with PostgreSQL and Supabase for data persistence, authentication, and role-based access control. Integrated third-party APIs and plugins (e.g., maps, payment gateways, forms) to expand functionality and user interaction. Performed thorough testing and debugging across both frontend and backend, ensuring smooth operation and a bug-free user experience. Optimized websites and APIs for performance, loading
Software Developer at Revature
September 30, 2022 - October 3, 2025Wrote and maintained clean, functional code to support new website features and enhance existing functionalities. Collaborated with senior developers to troubleshoot bugs, implement fixes, and improve system stability. Applied modern web development best practices, contributing to cleaner, more maintainable codebases. Assisted in the integration of third-party APIs and services, improving website capabilities and user experience. Participated in code reviews to ensure code quality, readability, and adherence to team standards. Conducted cross-browser and cross-device testing to identify and resolve compatibility issues, ensuring consistent behavior across platforms. Supported routine website updates and content changes to meet evolving client or business needs. Proactively stayed informed on emerging trends and technologies in frontend development, contributing to ongoing innovation. Helped maintain technical documentation for project requirements, workflows, and code references.
Frontend Developer at Empresa Agropecuaria de Camaguey
February 28, 2022 - October 3, 2025Developed interactive and responsive user interfaces using React.js, JavaScript, and CSS. Optimized application performance through code splitting, memoization, and efficient component rendering. Created reusable and modular components to maintain clean and scalable code. Implemented global state management with Redux or Context API to ensure data consistency. Integrated REST APIs and WebSockets to display dynamic, real-time data. Debugged and resolved issues using React DevTools and Chrome DevTools. Designed navigation flows with React Router to enhance user experience. Wrote unit and integration tests using Jest and React Testing Library to ensure code quality.
Education
Doctor of Education at NOVA SOUTHEASTERN UNIVERSITY
May 1, 2024 - December 31, 2024Master of Science at NOVA SOUTHEASTERN UNIVERSITY
May 1, 2021 - April 30, 2024Software Engineer at UNIVERSIDAD DE CAMAGÜEY
May 1, 2021 - April 30, 2024Doctor of Education at NOVA SOUTHEASTERN UNIVERSITY
May 1, 2024 - December 31, 2025Master of Science at NOVA SOUTHEASTERN UNIVERSITY
May 1, 2021 - April 30, 2024Software Engineer at UNIVERSIDAD DE CAMAGÜEY
May 1, 2021 - April 30, 2024Doctor of Education at NOVA SOUTHEASTERN UNIVERSITY
May 1, 2024 - April 30, 2025Master of Science at NOVA SOUTHEASTERN UNIVERSITY
May 1, 2021 - April 30, 2024Software Engineer at UNIVERSIDAD DE CAMAGÜEY
May 1, 2021 - April 30, 2024Doctor of Education at NOVA SOUTHEASTERN UNIVERSITY
May 1, 2024 - December 31, 2024Master of Science at NOVA SOUTHEASTERN UNIVERSITY
May 1, 2021 - April 30, 2024Software Engineer at UNIVERSIDAD DE CAMAGÜEY
May 1, 2021 - April 30, 2024Doctor of Education at Nova Southeastern University
January 11, 2030 - October 3, 2025Master of Science (Education) at Nova Southeastern University
January 11, 2030 - October 3, 2025Doctor of Education at Nova Southeastern University
May 1, 2024 - October 3, 2025Master of Science (Education) at Nova Southeastern University
May 1, 2021 - April 1, 2024Software Engineer at Universidad de Camaguey
May 1, 2021 - April 1, 2024Doctor of Education at Nova Southeastern University
May 1, 2024 - October 3, 2025Master of Science (Education) at Nova Southeastern University
May 1, 2021 - April 30, 2024Software Engineer at Universidad de Camaguey
May 1, 2021 - April 30, 2024Qualifications
Industry Experience
Software & Internet, Professional Services, Education, Manufacturing, Real Estate & Construction, Media & Entertainment
Skills
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