Vitalii K.

Reliable development partner with 19,000+ hours tracked on Upwork, focused on custom web application development. Backend: PHP, Laravel, API integrations, AI agents, cloud services, performance optimization, deployment. Frontend: Vue, Nuxt. 24/7 availability for emergencies 💼 20+ years of experience as a full stack web developer, ⭐ 5-star feedback on every job, 🕒 19,000+ hours tracked, 💸 $1M+ total earnings, 💯 100% Job Success, ✨ Top Rated Plus Backend Development - PHP development, custom web development, REST API design and development - Laravel framework: queues and background jobs, task scheduling, real-time events and broadcasting, Eloquent ORM, authentication, caching, monitoring, testing - Admin panels: Laravel Filament, Laravel Nova - Databases: MySQL, MariaDB, PostgreSQL, BigQuery, ClickHouse - Caching and search: Redis, Memcached, Sphinx Frontend Development - JavaScript, TypeScript - Responsive interfaces with Vue.js and Nuxt, built with Vite - Tailwind CSS, Bootstrap, shadcn-vue components - Frontend as a standalone SPA consuming a REST API, or tightly integrated with a Laravel backend via Inertia.js AI MVP Development - Rapid prototyping and MVP development using AI-assisted tools - AI features built on the Laravel AI SDK: chatbots, AI agents with tool calling, embeddings and vector search - Provider-agnostic setup supporting OpenAI, Anthropic, Google Gemini and more, so you can switch providers without rewriting code - MCP servers built with Laravel MCP, letting AI assistants like Claude and ChatGPT securely access your app's data and actions Legacy System Modernization - Auditing legacy code on older PHP versions (PHP 5, PHP 7) and upgrading to modern PHP 8.x - Upgrading frameworks to their latest versions - Rebuilding legacy codebases on modern Laravel - Migrating backends from other frameworks (Yii, Yii2, Symfony) to Laravel - Clear upgrade recommendations and a roadmap before any work begins Platform Integrations - Payments & subscriptions: Stripe, Worldpay, RevenueCat - Product analytics & attribution: Mixpanel, Adjust - Customer engagement & messaging: Klaviyo, CustomerIO, Twilio - Authentication & identity: Auth0 - Push notifications & real-time: OneSignal, Pusher - Email delivery: SendGrid, Mailgun - Monitoring & error tracking: Better Stack, Sentry - Integrations with various third-party data providers and APIs Performance & Speed Optimization - Tracing slow pages, profiling slow database queries, finding and fixing bottlenecks - Measuring and improving Core Web Vitals: LCP (loading speed), INP (responsiveness), CLS (visual stability) - Improving user interface and user experience Deployment & Ongoing Support - Server setup, environment configuration and monitoring: Linux (Ubuntu), Docker, Laravel Forge, Laravel Cloud - Deployment to VPS and cloud platforms, including Vercel for Nuxt frontends - Cloud experience: AWS, Google Cloud Platform, DigitalOcean, Cloudflare - Version control and team collaboration with Git and GitHub 🌍 Flexible with time zones and location. Happy to adapt to your workflow and willing to travel for in-person meetings. 🤖 Please note: I don't take part in AI-conducted interviews, but I'm always glad to talk with you directly.