Александр User

At Иридиум, I tested the server’s web interface, Android and iOS client applications, and touch panels across Windows and Linux. I prepared and released three major product releases with zero P0/P1 blocking defects in production.

I tested data exchange between servers, clients, and external services over REST API, WebSocket, and TCP/UDP sockets. I also tested the MS Outlook (EWS) module and Impersonation role model to prevent calendar desynchronization and permission leaks.

On project contracts, I tested payment gateways, user portals, and B2B services, including transaction logic and REST API contracts. I automated key payment endpoint tests with Python and PyTest, reducing routine regression time by 40%, and found a Kafka queue race condition before it could desynchronize user balances.

I focus on integration testing, defect localization through system logs and network traffic, and validating business transactions in PostgreSQL. I use Shift-Left Testing, including reviewing requirements and architecture during the design stage.