Vlad Vivian

As a Senior Frontend Developer at BeInCrypto, I architect and develop high-performance web applications for a global crypto news platform serving 10+ million monthly readers across 25+ languages, specializing in microfrontend architecture, Web3 integrations, and real-time blockchain data visualization. BeInCrypto - Top 3 global crypto media serving 10M+ readers in 25+ languages with real-time blockchain news and Web3 insights. Trust Project member. Key achievements: • Architected migration from legacy monolith to scalable microfrontend architecture using Next.js Multi-Zones, achieving 99.9% uptime, failure isolation, and enabling 10+ engineers to work in parallel • Implemented secure multi-auth system integrating NextAuth.js, Keycloak SSO, and Web3 wallets (MetaMask, WalletConnect) for seamless cross-chain authentication across EVM and Solana ecosystems • Developed real-time crypto market visualization using lightweight-charts, Apollo GraphQL, and WebSocket connections to Binance/CoinGecko APIs, handling 100+ trading pairs with <200ms latency • Built Web3 browser extension for Ethereum blockchain monitoring, tracking wallet activities, gas fees, and transaction history with Chrome Extension APIs • Integrated AI-powered development workflow with Claude Code, reducing code review time by 40% and improving code quality metrics from 3.2 to 4.5/5 • Optimized performance for high-traffic spikes during market volatility, ensuring smooth user experience for millions of daily visitors Key responsibilities: ▪ Leading frontend architecture decisions for scalable, maintainable solutions ▪ Implementing Web3 integrations and blockchain data visualization ▪ Optimizing real-time data streams and WebSocket connections Technologies: React, Next.js, TypeScript, Web3.js, ethers.js, MetaMask SDK, WalletConnect, Apollo GraphQL, WebSockets, lightweight-charts, Microfrontend Architecture, NextAuth.js, Ethereum, Solana, EVM, Binance API, CoinGecko API, Claude AI, SonarQube, Docker, i18n

As a Frontend Developer at Emex Group, I design and develop high performance web applications for an international automotive marketplace, emphasizing scalable architecture, web accessibility, and user experience optimization. Emex Group - International automotive aftermarket leader providing SaaS solutions and expert services for transportation products. The platform connects buyers with thousands of sellers, offering 40+ million product listings and fulfillment services across 40 countries worldwide. The ecosystem includes marketplace, expert consultation services, and warehouse management solutions. Key achievements: • Architected and developed a new Next.js project from scratch, implementing clean architecture patterns and best practices for maintainable, high-performance web applications • Engineered modern faceted search functionality using React and MobX, reducing page load time by 35% and improving user retention by 22% through optimized state management • Rebuild legacy registration system using React Hook Form and Yup validation, resulting in 32% performance improvement and 7% increase in successful registrations • Integrated Next.js shopping cart with infinite scrolling optimization, boosting cart-related performance by 30% and increasing transaction completion by 10% • Improved web accessibility from 81 to perfect 100 Lighthouse score, significantly improving SEO rankings and user experience • Created scalable UI component library with 16 reusable components using Radix UI and Storybook, accelerating team development velocity Key responsibilities: ▪ Leading frontend architecture decisions and implementing scalable solutions ▪ Working with UX/UI designers and backend teams ▪ Performing code reviews and ensuring code quality ▪ Optimizing performance and implementing accessibility standards Technologies: React.js, Next.js, TypeScript, MobX, RHF, Radix UI, SCSS, CSS Modules, Jest, React Testing Library, Storybook

As a Frontend Developer at Babbel, I created interactive features for the world's top-selling language learning platform, emphasizing user engagement and educational effectiveness through innovative React applications and data visualization solutions. Leading language learning platform serving millions of users worldwide with 1000+ employees and 20k+ teachers providing interactive lessons across 15 languages, helping people connect and communicate across cultures. Key achievements: • Built enhanced React-based translator with advanced language learning features and interactive UI, increasing user engagement by 10% and improving vocabulary retention by 7%, measured through app usage time and reduced churn rate • Developed interactive word relationship visualization system using React and D3.js, boosting vocabulary comprehension by 17% and average interaction time by 13%, helping users better understand word connections • Integrated real-time word breakdown feature with React-DnD, enabling dynamic word part exploration and resulting in 15% increase in user interaction • Guided junior developers and created comprehensive onboarding documentation covering project environments, tech stack specifics, and deployment processes • Worked with linguists and UX researchers to optimize learning experience through data-driven improvements Key responsibilities: ▪ Designing and implementing interactive educational features with React ecosystem ▪ Building intuitive data visualization solutions for language learning ▪ Working with cross-functional teams including linguists, designers, and UX researchers ▪ Creating and maintaining reusable component library ▪ Producing technical documentation and contributing to team knowledge base ▪ Performing code reviews and ensuring code quality standards Technologies: React.js, TypeScript, D3.js, React-DnD, MobX, HTML5, CSS3, Jest, React Testing Library, Webpack, Git, Storybook

As a Frontend Developer at F5-STUDIO, I focused on creating responsive web applications and e-commerce solutions, emphasizing user engagement and conversion optimization through React-based development and modern frontend practices. Digital creative agency providing web development, UX/UI design, and marketing solutions across various industries. With 100+ successful projects and 200+ employees, delivering comprehensive digital solutions including website development, mobile applications, and SEO optimization. Key achievements: • Developed interactive route builder using React.js and Google Maps API, enabling real-time route customization and route point management, boosting user engagement by 13% and improving overall platform usability • Enhanced mobile interface for travel planning platform using Tailwind CSS and responsive design principles, resulting in 38% improvement in mobile session duration and enhanced cross-device compatibility • Developed 15 reusable UI components including dynamic cost calculator and payment forms, implementing clean architecture patterns and reducing development time for similar features by 80% • Integrated new payment system with Stripe API and React, enhancing transaction security and user experience, boosting payment success rate by 4% and reducing support tickets by 6% Key responsibilities: • Building responsive web applications using the React ecosystem, TypeScript and state management tools like MobX or Redux • Creating reusable UI component libraries for e-commerce solutions while adhering to SOLID principles • Enhancing mobile-first designs, improving performance, and ensuring cross-browser compatibility • Working with UI/UX design teams, backend developers, and product managers to deliver scalable solutions • Writing and maintaining technical documentation, performing code reviews Technologies: React.js, JavaScript (ES6+), Tailwind CSS, Google Maps API, Stripe API, HTML5, CSS3, Git, Webpack, MobX, REST API, Jest

Throughout my academic journey, I gained extensive experience in frontend development, focusing on modern web technologies. I worked extensively with JavaScript (ES6+), React.js, HTML5, and CSS3, implementing responsive web designs and single-page applications with TypeScript and Material UI. My understanding of software architecture was strengthened through practical application of design patterns (Factory, Observer, Singleton), SOLID principles, and clean code practices (DRY, KISS, YAGNI). My coursework project involved developing a dynamic web application with interactive UI components and modern styling approaches using CSS modules and Tailwind CSS. This hands-on experience enhanced my skills in Git version control, npm package management, and development tools like Webpack and ESLint. Regular practice with data structures and algorithms, coupled with unit testing (Jest) experience, helped me build a strong foundation in computer science fundamentals.