Mairbek Madiev

• • Own frontend-heavy product flows end-to-end: API contract review, UI architecture, implementation, testing, and release support.

• • Implemented role-based access paterns for admin, manager, and employee workflows, aligning UI visibility with backend permissions to reduce inconsistent states and data-exposure risk.

• • Built reusable React/TypeScript UI components and complex form paterns for dashboards, CRUD modules, and operational workflows.

• • Improved delivery quality through unit and integration tests, CI checks, dependency upgrades, refactoring, and release-guarding practices.

• • Worked closely with backend and product stakeholders to translate business logic into predictable UI behavior and maintainable code.

• • Built and maintained real-time frontend flows for transaction and terminal status processing, normalizing WebSocket events and keeping application state stable under high-frequency updates.

• • Developed monitoring dashboards for 5,000+ payment terminals, exposing live metrics for transactions, device health, error states, and operational alerts.

• • Integrated REST/GraphQL APIs with React/Next.js frontends and supported Node.js services for event handling and operational tooling.

• • Participated in regression testing for payment-critical flows and documented edge cases to prevent transaction inconsistencies and state desynchronization.

• • Earlier responsibilities included diagnostics, software setup, troubleshooting, repair, and maintenance of payment terminals, giving strong domain knowledge of FinTech operations.