Viktor Dziubin

I build backend systems for a high-volume ticketing and e-commerce platform processing 90,000+ orders per month. I work across event, order, checkout, payment, refund, and ticketing flows using PHP 8, WordPress, Laravel Eloquent, and MySQL/MariaDB.

I migrated scattered WordPress data access and raw SQL toward Laravel Eloquent models, relationships, and reusable scopes while preserving API contracts. I also designed denormalized data projections to reduce JOIN-heavy reads in listings, filtering, sorting, and statistics.

I designed and evolved a ledger-based loyalty and internal wallet system covering credits, debits, reservations, refunds, reversals, expiration, reconciliation, and idempotency. I established safer transaction boundaries, row locking, deadlock handling, and retries to prevent partially persisted financial state.

Earlier, at Craftpromotion, I developed Laravel and WordPress e-commerce projects, payment integrations, and a Laravel + Vue.js product configurator. Across my work, I modernize legacy PHP code, improve SQL performance and correctness, build REST APIs, and support changes with PHPUnit integration and unit tests.