Kelvin O

Full Stack Developer | API Integration & Website Developer

Development Plus • Autônomo

Feb 2023 - Present • 3 yrs 5 mos

As a Full Stack Developer, I specialize in API Development, REST API Integration, and custom website solutions for businesses. I build secure, scalable, and high-performance applications while delivering clean, maintainable code. My expertise includes WordPress API, PHP API Development, Stripe Integration, Payment Gateway Integration, Custom Website Development, Website Development, Backend Development, and workflow Automation. I also provide Shopify, WooCommerce, and Squarespace custom coding, bug fixes, performance optimization, and third-party API integration. I develop and integrate secure REST APIs, connect external services, troubleshoot complex website issues, optimize website performance, and implement responsive, user-friendly solutions tailored to business goals. Every project is carefully tested to ensure security, reliability, and long-term scalability. I am committed to delivering high-quality development solutions, clear communication, on-time delivery, and ongoing technical support to help businesses grow through modern web technologies.

Full Stack API Integration Developer

Software Engineering Daily • Autônomo

Jan 2023 - Present • 3 yrs 6 mos

I specialize in building and managing API integration, REST API, and custom backend solutions for businesses that need reliable software connections and automation. I help clients connect third-party platforms, payment systems, ecommerce tools, and business applications through secure and scalable integrations. My experience includes developing API development solutions using Node.js, PHP API, and backend technologies, integrating Stripe integration, payment gateway integration, WordPress API, and Shopify API solutions. I also build workflow automation using tools like Zapier automation, webhooks, and AI-powered integrations to help businesses improve efficiency. I have worked on projects involving custom API, API automation, payment integration, CRM integration, ecommerce platforms, and full-stack web applications. I focus on creating clean, secure, and optimized solutions that solve real business problems and improve digital workflows. Skills: API Integration, REST API, API Development, API Developer, Automation, Stripe Integration, Payment Gateway Integration, Node.js, PHP API, WordPress API, Shopify API, Zapier Automation, Webhooks, AI Integration, Backend Development, Full Stack Development

Mobile App Developer | Flutter & React Native Developer

Mobiles Studio • Autônomo

Mar 2022 - Present • 4 yrs 4 mos

As a Mobile App Developer, I specialize in App Development, Mobile App Development, and cross-platform application solutions for startups, businesses, and entrepreneurs. I build fast, secure, and user-friendly Android Apps, iOS Apps, and hybrid mobile applications using modern development frameworks. My expertise includes Flutter Development, React Native App Development, App Creation, Android Development, iOS App Development, and Website Development with seamless backend integration. I also develop AI-powered mobile apps, SaaS applications, Firebase-integrated apps, and business applications tailored to client requirements. From planning and UI implementation to API integration, testing, optimization, and app publishing, I focus on delivering scalable, high-performance mobile applications that provide an excellent user experience across Android and iPhone devices. I am committed to writing clean, maintainable code, delivering projects on time, and providing reliable technical support to help businesses launch and grow successful mobile applications. Skills Mobile App Development Flutter React Native Android Development iOS App Development App Development Firebase REST API Integration Mobile UI Development Cross-Platform Development