Anastasiia-Oli contributed to the fur-seal-team and fur-seal-team-js repositories by building core front-end features using HTML, CSS, and JavaScript. She developed a responsive hero section with optimized images and avatars, and implemented a dark-themed footer with structured navigation, social links, and legal policies, ensuring consistent performance across devices. Her work included targeted bug fixes, such as correcting navigation links for reliability. In a later phase, she delivered a dynamic My Projects Gallery with a load-more mechanism, focusing on scalable, data-driven UI components. Her approach emphasized maintainable code, responsive design, and improved user engagement through thoughtful interface enhancements.