Kostiantyn Borysenko

Developed an internal HR platform for HR managers and leaders across the company. Owned end-to-end delivery across UI, backend logic, SQL Server, Azure services, and testing. Automated employee data workflows, HR requests, reports, Zendesk tickets, and file migration. • Built a backend service for secure Excel and PDF file retrieval, storage, and status tracking. • Designed SQL Server tables for audit trail, data categories, processing states, and errors. • Implemented REST APIs for file extraction with structured folders, logging, and error handling. • Configured Hangfire jobs running every 5 minutes for 24/7 file extraction and storage. • Automated daily HR workflows and monthly reports for employee data and internal operations. • Integrated ADP data, email workflows, Zendesk ticket creation, and HR request processing. • Integrated employee data with Microsoft Teams chats via Graph APIs and custom role/location filters. • Rebuilt unstable Selenium UI tests with Playwright, reaching 70% coverage and fewer timeouts. • Reduced CI/CD pipeline failures by about 80% and supported $85,000 in annual savings.

Developed e-commerce features for a biotech website serving scientists and university students. Improved checkout, product pages, and internal tools for sales, marketing, and regulatory teams. Supported a Java-based EQMS used for lab safety training, assessments, and employee readiness. • Redesigned a three-page checkout into a two-step flow with a side cart to reduce drop-offs. • Improved checkout UI and frontend logic with marketing to make purchasing faster and clearer. • Built and refactored product filters, new pages, and e-commerce features on PHP and MySQL. • Reduced checkout-related support ticket volume by about 10% over a three-month period. • Supported sales goals by lowering manual assistance needed for customer self-service orders. • Customized a Java EQMS for lab safety courses, testing workflows, email service, and storage. • Worked with designers, QA, business teams, and regulatory stakeholders on production changes. • Applied DRY principles across product pages to improve maintainability and update speed. • Used Screaming Frog and Lighthouse to review SEO, page quality, and performance issues.