Architected and built a comprehensive coaching business management platform integrating booking, scheduling, contract management, and Romanian e-invoicing compliance into a unified system
Developed an interactive calendar booking UI with real-time Google Calendar availability sync and dynamic time-slot blocking
Built a custom REST API layer ensuring reliable endpoint access for all user roles, including unauthenticated visitors
Implemented OAuth 2.0 and Service Account authentication flows for Google Calendar API, including automatic token refresh, database-backed token persistence, and migration tooling from file-based token storage
Developed a custom plugin handling electronic contract generation and signing workflows, PDF invoice generation, and ANAF e-Factura compliance for Romanian electronic invoicing regulations
Built an Electron-based desktop application for client session management, featuring a REST API integration layer, IPC handler architecture, and a tabular client dashboard UI
Diagnosed and resolved a range of silent failure modes across the stack: database schema initialization, API route registration failures, user metadata key mismatches, and invoice counter race conditions causing unique key collisions
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