pilkevych

Optimized a performance-critical identity verification flow (capture => validation => result) by reducing redundant GraphQL requests by ~33%, improving TanStack Query caching, and eliminating unnecessary re-renders, accelerating data load time from 4.1s to 3.2s (~21%). Refactored a legacy biometric UI used across 4 production applications into a modular React component architecture within a shared monorepo, eliminating cross-module duplication and improving maintainability. Contributed to the development of a biometric identity verification platform that processed 83M+ successful verification requests within the first two months of production. Collaborated with QA to redesign the Playwright E2E test architecture across three production applications in a shared monorepo, introducing shared fixtures and reusable helpers that reduced CI test runtime from 1h17m to 53m (~31%) and improved test reliability and maintainability. Designed a shared frontend verification package used across multiple applications, standardizing domain logic and reducing duplicated implementation across teams.

External development team for Slovenská Sporiteľňa (one of the largest banks in Slovakia). Implemented complex multi-step banking form flows with strict validation and regulatory requirements, improving data consistency and reducing user input errors. Optimized Redux-based state management and asynchronous data flows in banking dashboards, reducing unnecessary component re-renders and improving UI update performance by ~11%. Refactored legacy React components to standardize state handling and reduce duplicated logic across multiple dashboard modules. Investigated and resolved production issues by tracing failures across the frontend and API layers using logs, network debugging, and error monitoring tools.

Built responsive UIs using HTML/CSS and React. Integrated frontend with Node.js / Express APIs including authentication flows. Implemented Stripe checkout integration with Apple Pay and Google Pay support.