oleksiivolkov

Built high-performance charting components handling 10k–50k live data points, enabling smooth interaction with large datasets and removing UI performance bottlenecks for analysts. Integrated the yFiles graph visualization library to represent multi-level corporate ownership structures, introducing a new analytical capability for exploring fund relationships. Designed a unified client-side data model across multiple APIs, eliminating recurring data inconsistencies and reducing frontend mapping errors in production. Delivered responsive, WCAG-compliant dashboards across a wide range of screen sizes, maintaining usability under high data density conditions. Established modular architecture in a Turborepo monorepo, enabling shared components across applications and reducing cross-package regressions.

Migrated state management from Redux to Zustand, reducing boilerplate by ~60% and simplifying state logic across the application. Designed a reusable data-table component supporting sorting, filtering, pagination, and inline editing — became the core UI building block across the product. Built a shared component library and custom hooks that accelerated feature development and reduced setup time for new screens. Collaborated with the backend team on API contracts, identifying schema mismatches early and preventing integration issues before QA.

Delivered full-stack features across a Node.js/GraphQL API and React admin interface, supporting continuous product development. Maintained a distributed order-processing system using MongoDB, Redis, and RabbitMQ, ensuring stable operation without data-loss incidents. Contributed to 80%+ test coverage on new code, enabling frequent and reliable production releases.

Built layouts in React with Redux, integrated backend APIs, implemented project cards (sorting, viewing, navigation), marketplace section, and newsfeed for a Cryptocurrency Marketplace. Built an interactive online exhibition with Next.js, TypeScript, Directus CMS, and Styled Components, with server-side rendering for SEO and performance for Ukrainian Architecture Exhibition. Integrated a React frontend with a Drupal 8 CMS for a major Ukrainian bank; implemented AMP pages, improved form functionality, and provided ongoing maintenance for IdeaBank. Built product, category, and user pages in React with a Magento 2 backend for Fancy Factory.