Janusz Mazur

*Developed a sophisticated web application using React.js and Node.js. *Collaborated with the design team to create a visually appealing and user-friendly interface. *Coordinated with the QA team to identify and resolve bugs in the application. *Developed a sophisticated web application using React.js and Node.js. *Collaborated with the design team to create a visually appealing and user-friendly interface. *Coordinated with the QA team to identify and resolve bugs in the application.

*Developed web applications for a tech start-up, achieving a 50% improvement in customer retention. *Created a website for a prominent retail store, leading to a 59% increase in web traffic. *Implemented a content management system for a major magazine publisher, reducing support costs by 42%. *Designed and managed a small business website, which resulted in a 26% growth in their customer base. *Built a responsive e-commerce website for a global clothing retailer, boosting online sales by 23%.