I’m Ervin Kacar, a frontend-focused full-stack engineer. I build web and mobile apps with React/Next.js and React Native, backed by Node.js/Express and relational databases (PostgreSQL/MySQL). My strongest domain is telecom, where i delivered real-time analytics dashboards and voice/SMS platforms, improving UI latency through smarter caching, pagination/virtualization, and tighter API contract, owning features end-to-end. I’ve also contributed to production React Native apps (500k+ downloads) and EdTech/B2B products,owning core flows like authentication, onboarding, and notifications while measuring and improving UX quality. In parallel, I’m building BookUp, a global appointment-scheduling platform (Node/Express API + modern React UI, multilingual, multi-step booking), which keeps me hands-on with end-to-end ownership and clean architecture. As a lecturer at a technical high school, i taught HTML/CSS/JavaScript/React, which sharpened my communication, code quality, and team practices. I bring deep frontend skills (SSR/ISR, state management, React Query/RTK, MUI/Tailwind), pragmatic backend (REST, auth, RBAC, file upload), a performance/UX mindset, and reliable, iterative delivery with clear estimates.…I’m Ervin Kacar, a frontend-focused full-stack engineer. I build web and mobile apps with React/Next.js and React Native, backed by Node.js/Express and relational databases (PostgreSQL/MySQL). My strongest domain is telecom, where i delivered real-time analytics dashboards and voice/SMS platforms, improving UI latency through smarter caching, pagination/virtualization, and tighter API contract, owning features end-to-end. I’ve also contributed to production React Native apps (500k+ downloads) and EdTech/B2B products,owning core flows like authentication, onboarding, and notifications while measuring and improving UX quality. In parallel, I’m building BookUp, a global appointment-scheduling platform (Node/Express API + modern React UI, multilingual, multi-step booking), which keeps me hands-on with end-to-end ownership and clean architecture. As a lecturer at a technical high school, i taught HTML/CSS/JavaScript/React, which sharpened my communication, code quality, and team practices. I bring deep frontend skills (SSR/ISR, state management, React Query/RTK, MUI/Tailwind), pragmatic backend (REST, auth, RBAC, file upload), a performance/UX mindset, and reliable, iterative delivery with clear estimates.WWWW…