Ivar Kallejärv focused on enhancing UI stability and build reliability within the TEHIK-EE/tedi-design-system repository during April 2025. He addressed a critical webpack serialization issue by standardizing SCSS alignment, replacing 'align-items: start' with 'align-items: flex-start' across multiple files. This targeted CSS and SCSS update resolved layout inconsistencies and reduced runtime errors, directly improving component reliability and maintainability. Although no new features were introduced, Ivar’s work concentrated on quality assurance and long-term stability. His approach demonstrated a strong command of front end development principles, with careful attention to traceability and alignment standards across the codebase.