Elijah Zaichenko Email & Phone Number

Los Angeles, Ca, Us

San Jose, California, United States

TASQA CORP – A startup by engineers for the IT sector, where people gain skills using AI.Key Responsibilities and Achievements:✔️ Team Leadership: Direct and manage a diverse team to ensure project delivery on time and within budget.✔️ AI Integration: Utilize AI and ML (Google, OpenAI) to enhance training tasks and simulations.✔️ Personalized Training: Implement customizable training modules for various professional goals.✔️ Tech Stack Management: Leverage React, Node.js, TypeScript, Express, JWT, and Docker.✔️ Security Measures: Implement and maintain robust data protection strategies and secure

Moscow, Moscow City, Russia

Experience with a high-load enterprise project with over 1 million users and 600+ corporate clients. Addressed challenges in an outdated codebase and implemented strategic improvements: reduced network latency by 13%, decreased development time by 11%, and improved Time to Interactive by 15%, updated to React 16+.Key Responsibilities and Achievements:✔️ Application Functionality and User Experience: Redesigned key application features to enhance user interaction and accessibility using React 17 and Material-UI, significantly improving customer satisfaction and engagement metrics.✔️ Optimized Rendering Performance: Improved rendering processes in complex financial tables using virtual DOM techniques and hooks like useMemo, useCallback, and useEffect, resulting in a 37% increase in rendering speed and reduced load on client systems.✔️ Network Latency: Refined API calls and integrated Axios for efficient data fetching, throttling, and canceling responses, reducing network latency by 13% and enhancing real-time staff interaction responsiveness.✔️ Transition to Modern React Components: Transitioned from React class components to functional components using Hooks with React 17, improving project maintainability, reducing development time by 11%, and enhancing project scalability.✔️ Improved Time to Interactive (TTI): Enhanced critical loading paths and JavaScript bundles using Webpack, React Lazy Loading, and CDN, boosting Time to Interactive by 15%, making the application quicker for end-users.

Krasnodar, Russia

These initiatives enhanced the user interface and experience within the SPA, resulting in a 14% reduction in bounce rate and a more engaging and efficient user experience.Key Responsibilities and Achievements:✔️ Content Delivery Network (CDN) Utilization: Deployed assets across multiple servers using UNPKG, significantly decreasing load times for users in different regions.✔️ Browser Caching Enablement: Configured HTTP cache headers to allow browsers to store previously downloaded resources, drastically reducing load times on subsequent visits.✔️ Rendering Efficiency Optimization: Improved the efficiency of rendering complex nested financial tables by adopting virtual DOM techniques and integrating React refs to manage component instances more effectively.✔️ Mobile Optimization: Ensured the website's mobile responsiveness by adjusting layouts, buttons, and interactive elements to work seamlessly on mobile devices, improving the user experience for mobile users.

Krasnodar, Russia

At this stage of my development, guidance and mentorship from experienced developers accelerated my learning curve and proficiency in React, Next.js, UI frameworks, axios, React Hooks, and SOLID and OOP paradigms.Key Responsibilities and Achievements:✔️ Customizable Theme Implementation: Implemented a customizable theme using SCSS and Styled Components, enhancing the application's visual appeal and user customization options. This resulted in increased user satisfaction and engagement, with the feature showcased on wilix.ru.✔️ Bug Resolution for Seamless Experience: Resolved various user experience bugs using TypeScript and comprehensive debugging techniques, ensuring seamless and stable application functionality across all platforms.✔️ Optimization of Page Load Time: Utilized server-side rendering with Next.js and optimized assets to significantly reduce the application’s page load time, enhancing user retention and boosting SEO performance.✔️ Mobile Optimization: Implemented advanced CSS and JavaScript techniques for mobile optimization, ensuring the application delivers a superior mobile user experience. This improvement led to enhanced engagement metrics and better accessibility on mobile devices.

Krasnodar, Russia

This early experience allowed me to understand client requirements deeply and enhance my project management skills, laying a strong foundation for my career growth.Key Responsibilities and Achievements:✔️ Backend Optimization: Boosted app performance by 100% through backend and API enhancements, resulting in faster response times.✔️ Automated Deployment: Rebuilt architecture for fully automated web app releases, reducing deployment errors by 50%.✔️ React App Development: Created a 10-screen React web app, enhancing user experience and scalability.✔️ Multilingual Localization: Localized the website in Russian, English, and German, increasing user engagement by 30%.