Plamen Kostadinov

Delivered short-term WordPress development and maintenance for multiple clients, including landing pages, third-party integrations, WooCommerce and Multisite changes, and lightweight Gutenberg blocks. Troubleshot and extended existing themes, plugins, and client-specific functionality across varied WordPress stacks.

Supported a backend team handling a portfolio of ~9,000 independent WordPress sites. Re-engineered a multilingual API import pipeline by replacing an inefficient postmeta model with 6–8 custom SQL tables, including source/override handling, batched concurrent processing, and retry queues—reducing a full import from several hours to ~90 seconds. Built a monitoring plugin that used an external crawler to validate actual rendered frontend output across three unrelated internal plugins, detecting missing/duplicate dynamic content impacted by JavaScript, AJAX, and geolocation.

Maintaining a large portfolio of websites, creating new features, and refactoring legacy code to improve stability and performance across multiple projects, with a focus on security and scalable architecture.