May 2025 performance snapshot across Netcracker's API hub projects focused on delivering developer experience improvements, reliability, and performance at scale. Key features delivered spanned two repositories: qubership-apihub-rest-playground and qubership-apihub-ui. Highlights include: 1) Playground Documentation with Storybook and OpenAPI samples, plus published Storybook on GitHub Pages to accelerate API consumer onboarding; 2) Frontend CI/CD workflow modernization with npm-gitflow, extending hotfix/bugfix triggers and aligning with updated gitflow; 3) UI Publish Dialog UX enhancements for robust form validation, preselection of status/labels for republish, and controlled enabling of dependent fields; 4) Global UI asset caching and performance improvements via HTTP caching for static assets, a Vite plugin for content-hash-based cache busting of Monaco Editor workers, and updated Nginx cache-control headers. Major bugs fixed include correcting API operation example rendering in the Playground and resolving version handling/display issues in Publish Dialogs. Overall impact: faster release cycles, more reliable OpenAPI rendering, improved UX consistency, and reduced misconfigurations. Technologies/skills demonstrated: React, Storybook, OpenAPI, npm-gitflow, GitFlow alignment, Vite, HTTP caching strategies, Monaco Editor, and Nginx cache-control tactics.