Square (Block)

Shipped Java/Kotlin Android POS inventory-adjustment flows across catalog, inventory, and checkout modules, building UI/state management, integrating backend APIs, and handling multi-location stock conflicts. The work resolved deal-blocking requirements for 2 merchants representing $94M in annual GPV.

Built location-aware Android POS tax logic, integrating merchant-location state with tax-rule APIs to dynamically apply jurisdiction-specific checkout taxes. This addressed requests from 5 merchants representing $190M in annual GPV.

Added production event instrumentation for a cross-team Android POS workflow, unblocking A/B test rollout and avoiding an estimated 3-week launch delay.