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mrrandy630

Sergey Y

@mrrandy630
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Sobre mim
Full-stack web developer specializing in modern e-commerce solutions with React, Node.js, Express, and MongoDB. I recently developed a complete online store from scratch, including a custom admin panel, product and order management, 1C integration, SEO optimization, Schema.org, sitemap generation, Google authentication, image optimization, and performance improvements. I build scalable, responsive, and business-focused web applications with clean, maintainable code.... Saiba mais

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mrrandy630
Sergey Y
offline • 
Tempo médio de resposta: 1 hora

Conheça meus serviços

Webflow
I will develop a modern responsive ecommerce website
A partir deUS$ 100 /projetoMais detalhes
Sites Personalizados
I will build a custom mern stack e commerce website
A partir deUS$ 100 /projetoMais detalhes

Portfólio

Experiência profissional

Freelancer.com

Full-Stack Web Developer

Freelancer.com • Freelance

May 2022 - Present • 4 yrs 2 mos

Full-Stack Web Developer | Freelance Worked as a freelance Full-Stack Web Developer, designing, developing, deploying, and maintaining custom web applications and e-commerce platforms from concept to production. Specialized in building modern, responsive, and high-performance websites using React, JavaScript (ES6+), Node.js, Express.js, and MongoDB. Developed scalable REST APIs, optimized database architecture, implemented authentication systems, and integrated third-party services for real business projects. Key responsibilities included: • Full-cycle web application development from planning to deployment • Frontend development with React, HTML5, CSS3, and modern JavaScript • Backend development using Node.js and Express.js • REST API architecture and secure API integration • MongoDB database design, optimization, and data synchronization • Authentication and authorization using JWT • Payment gateway integration and order processing systems • Google SEO optimization, Schema.org structured data, XML sitemaps, robots.txt, and metadata optimization • Performance optimization including lazy loading, image optimization, caching, and Core Web Vitals improvements • Responsive UI/UX implementation for desktop, tablet, and mobile devices • Development of custom administration panels for content and product management • Third-party API integrations, automation tools, and synchronization systems • Deployment, maintenance, debugging, and long-term technical support Throughout my freelance work I have successfully delivered complete business solutions including custom e-commerce platforms, inventory management features, product synchronization systems, advanced search and filtering, SEO optimization, and user account functionality. My focus is always on writing clean, maintainable, scalable code while delivering reliable and user-friendly applications that help businesses grow.