Senior PHP Back-end Developer with 17+ years in software development, including 12+ years of commercial experience building scalable, secure, and high-performance web applications. Strong expertise in system architecture, RESTful API design, database modeling, and performance optimization. Proven track record of delivering complex backend systems across SaaS, Healthcare, FinTech, CRM, and enterprise platforms. Expert in high-load environments, legacy migrations, and building Generative AI/LLM solutions (RAG architectures).
Own SaaS product: full architecture design and development of a contextual semantic search platform built on RAG. Implemented hybrid search (Vector + Full-Text) via Reciprocal Rank Fusion (RRF), an embedded chat widget and Telegram bot, strict context-bound answer generation, and client chat history retention.
Enterprise SaaS for sales analytics and demand forecasting. Designed the high-load backend architecture, integrated third-party services (HubSpot CRM, Mailjet), built the subscription system on top of Staxbill, optimized analytical queries across ClickHouse/PostgreSQL, and set up asynchronous queues and real-time WebSocket notifications.
Custom CRM for sales automation and operations. Designed the backend architecture from scratch, built product, order, lead and graphical analytics modules. Engineered data mapping and migration from MySQL, two WordPress sites and file-based (XLSX) sources into the CRM, plus two-way QuickBooks Desktop integration.
Healthcare ecosystem connecting physicians, pharmaceutical manufacturers and delivery services. Implemented client identification from fax documents via Tesseract OCR, insurance eligibility checks across multiple services, database anonymization, medication order processing, and SignalWire integration for fax and voice notifications.
Backend services for an automated presentation platform. Implemented import of presentations from files into a web format, separation of content from styling, online editing, document generation and export (Dompdf, PHPPresentation), plus AI text-to-speech and speech-to-text (Azure), Firebase notifications and WebSockets.
Ecosystem of web resources and internal services for the Volvo dealer network. Fully rewrote the legacy monolith (CodeIgniter/Native) to Laravel. Built management services: dealer CRM, vehicle inventory, quote generators, content synchronization and a test-drive booking widget.
Ticketing, event management and social networking platform. Built the seat-booking system for venues and a promo-code engine, backend logic for trip planning, group travel and joint hotel booking, plus live ticket scanning and event scheduling.
Web platform for apartment and car rentals in Montenegro. Designed the architecture from scratch, built the booking and booking-management system, a filterable catalog and optimized MySQL schemas for order processing.
Media platform for uploading, processing and selling content. Users submitted photos and videos via mobile apps and REST API; the server automatically generated previews with watermarks, transcoded media (FFmpeg/ImageMagick) and published it on the marketplace for sale.
Development of custom web applications from scratch and via popular CMS frameworks. Designed database schemas, custom plugins, e-commerce systems, and backend integrations. Configured Apache web servers, managed hosting platforms, domain setups, and site speed optimizations.
Associate's Degree — Ukrainian Academy of Printing (Maintenance and Repair of Printing Equipment)