Andrii Panchenko

Worked on a React legal-document platform and two production products for a confidential financial-services client.

• Built module- and action-level permissions for a React 18 legal platform. Administrators could edit access rules directly in the UI.
• Built a split-view legal-document composer with live preview and stabilised it after launch.
• Delivered a three-step employee-equity flow with live calculations, document review and approval. Covered calculations with unit and manual tests.
• Owned most of the frontend for a trading-account flow embedded into two sell-order paths, including validation, statuses and error handling.
• Maintained an Angular 6 employee-benefits product and contributed to an unreleased Angular 12 upgrade branch by typing API models, replacing deprecated packages and fixing compatibility issues.

Built warehouse workflows for Zebra barcode-scanner devices, first in a production React application and later in a new Flutter mobile version.

• Worked in a five-person React and TypeScript team, contributing to frontend decisions, code reviews and client discussions.
• Built quantity-management workflows, API integrations and operational screens for warehouse employees.
• Later rebuilt the same workflows in Flutter as the team developed a fully mobile version from scratch.
• Wrote Flutter Golden Tests for the CI suite and supported teammates with guidance from a senior Flutter engineer.

Built production frontend products across property management, chemical inventory and location-based service booking.

• Made the units screen usable for a customer with approximately 1,500 apartments by cutting redundant requests and reducing render and DOM work.
• Created a PDF.js viewer for 300–1,000-page documents with lazy canvas rendering, search, zoom, navigation and download.
• Reviewed code and helped 3–4 junior developers with debugging and day-to-day technical decisions.
• Built a greenfield React and TypeScript chemical-inventory frontend as the sole frontend developer.
• Worked across React/TypeScript and Laravel API controllers on location discovery, scheduling, job management and long-polling chat for a marketplace released to production.