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Vadim Olenyuk

@vadimolenyuk

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Senior PHP developer and .NET C# engineer specializing in microservices, modernization, and scalable web apps.

Ukraine

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What I'm looking for

I’m looking for a role where I can modernize and extend real production systems—PHP and .NET microservices—working with REST/SSO (Keycloak), databases, and performance-focused development, while collaborating on clean architecture and reliable deployments.

I’m a PHP Developer /.NET professional with 10+ years in PHP ecosystems (Yii1/Yii2, Symfony 3/4) and recent, hands-on C#/.NET Core work on microservices. I focus on building reliable features, improving existing systems, and making production code easier to maintain.

At Bit media Ukraine, I optimized legacy code and fixed complex production bugs, developed batch import/export modules (CSV/Excel) for user synchronization, and delivered mass course assignment workflows for 10k+ records. I also created dynamic multi-step forms with conditional logic and extended functionality with custom reports, user progress tracking, and SCORM package handling.

For the last 2 years, I’ve supported and extended distributed C# microservices—adding features like user management logic and role synchronization. I work with Entity Framework Core (including migrations) and integrated C# services with Keycloak for SSO token validation and user data sync.

Earlier projects strengthened my web platform skills across Symfony (SonataAdmin, Twig, Vue.js) and Elasticsearch-based development, plus PHP framework experience including Phalcon and CMS work. My working style is pragmatic: understand the system deeply, ship improvements safely, and keep performance and data integrity in mind.

Experience

Work history, roles, and key accomplishments

PHP Developer / .NET

Bit Media Ukraine

Nov 2018 - Apr 2026 (7 years 5 months)

Optimized and fixed legacy PHP (Yii/Yii2) code in production and built batch CSV/Excel import-export modules for user synchronization and mass course assignments (10k+ records). Extended distributed .NET Core/.NET 6+ microservices using Entity Framework Core migrations and integrated Keycloak SSO for token validation and user data sync.

PHP Yii Entity Framework PostgreSQL Keycloak SCORM Docker

PHP Developer

Metrabit

Aug 2018 - Nov 2018 (3 months)

Developed a gallery website with Symfony by designing the database, implementing CRUD and dynamic forms, and adding validated file upload handling. Built server-side rendering with Twig and interactive components using Vue.js.

Symfony SonataAdmin Doctrine Twig Vue.Js MySQL RESTful APIs

PHP Developer

Kamilabs

Jul 2017 - Feb 2018 (7 months)

Developed a corporate news website, building RESTful APIs and database design, and integrating Elasticsearch for search capabilities. Implemented the solution using Symfony 3 and PHP 7.1.

Symfony Elasticsearch RESTful API Design MySQL Database Design Git API Development Web Backend

PHP Developer

Faktor

Oct 2015 - Feb 2017 (1 year 4 months)

Developed and optimized PHP/MySQL websites using Ajax, JavaScript/jQuery, HTML, and CSS, maintaining and improving existing projects. Contributed to a corporate CRM system and worked with the Phalcon framework, including short CMS work with WordPress and Webasyst.

PHP MySQL AJAX JavaScript JQuery HTML CSS Phalcon CRM Development WordPress Webasyst Web Optimization

PHP Developer (Remote)

Remote Job

Apr 2013 - May 2015 (2 years 1 month)

Worked on existing remote projects using PHP and MySQL with Ajax and JavaScript/jQuery, implementing front-end and back-end features with a custom-written framework.

PHP MySQL AJAX JavaScript JQuery HTML CSS Legacy Project Support Remote Development