About Dmytro
Senior PHP/Symfony Developer | 13+ Years | Legacy Modernization & Domain-Driven Design
I help companies turn aging PHP codebases into maintainable, well-tested systems — without rewriting everything from scratch.
Over the past 13 years I've worked across healthcare, e-commerce, and auction platforms in the Netherlands, consistently delivering where it matters most: upgrading PHP 7.x applications to 8.x, designing domain modules using DDD principles, building reliable APIs and integrations (REST, SOAP), and putting solid test coverage in place with PHPUnit and Behat.
What clients typically hire me for:
- Legacy modernization — PHP/Symfony upgrades, dependency cleanup, security hardening. At Medicore I upgraded a Symfony app from 7.4 to 8.4 and resolved 50% of critical security vulnerabilities.
- Domain-driven backend design — I've designed SOAP integration modules for Dutch healthcare (iStandaarden iJW), authorization systems used by 800+ organizations, and complex business-logic engines for auction platforms.
- Reliable delivery — I write tests, I document decisions, and I communicate clearly. I've worked as a freelancer embedded in Dutch product teams since 2022 and know how to ship without friction.
Tech I work with daily: PHP 8.x, Symfony, Doctrine, MySQL, RabbitMQ, Kafka, Docker, Linux.
Based in The Hague area, Netherlands. Available for remote contracts across Europe.
English
Native or bilingual
Ukrainian
Native or bilingual
Remote only
Primarily works remotely
Experience
- Medicore B.V.,Freelance Backend DeveloperMay 2024 - May 2026 (2 years)Utrecht, Netherlands
- Upgraded a Symfony application from PHP 7.4 to PHP 8.4, addressing compatibility and deprecated features.
- Prototyped a new version of the document management system with user-defined templates, placeholders, and formatting.
- Prototyped and implemented document signing module using Zynyo third-party provider.
- Fixed 50% of the critical security vulnerabilities.
- Emesa B.V.,Freelance Backend DeveloperE-COMMERCEJanuary 2022 - April 2024 (2 years and 3 months)Amsterdam, Netherlands
- Developed and maintained backend features for a high-traffic auction platform built with Symfony, Kafka, and Kubernetes.
- Worked within a DDD/CQRS-based voucher microservice
- Delivered features using Kafka for event-driven communication in a microservices environment.
- Rentman B.V.,Backend DeveloperDIGITAL AND ITApril 2020 - December 2021 (1 year and 8 months)Utrecht, Netherlands
- Prototyped a standalone invoice-processing microservice using Lumen (Laravel-based framework).
- Extended the statistics module's filtering from a single week to multiple months, meeting performance requirements on larger datasets.
- Developed backend features in PHP, working with a custom GraphQL-like data layer for frontend queries.
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Education
- Master's degreeKharkiv National University of Radio Engineering2012Master's degree