- Designed backend application from scratch in a short time- Implemented integration and synchronization with multiple data sources- Refactored DB schema and increased search API endpoint performance: speed gain 300%

- Refactored the system architecture.- Created a message throttling system based on Redis.- Implemented a SMTP processing engine.- Performed MySQL queries optimization.- Updated Elasticsearch queries.- Wrote unit tests.Technologies: PHP7, Laravel, MySQL, Elasticsearch, Redis, PHPUnit

- Implemented access control lists with hierarchical architecture.- Set up continuous integration using AWS Elastic Beanstalk.- Added export reports to PDF.- Optimized Elasticsearch queries.- Wrote unit tests.Technologies: PHP, Symfony, PHPUnit, MySQL, Elasticsearch, AWS

- Participated in migrating a Zend application to the Laravel framework.- Created site parser with complicated logic.- Created different file importing procedures.- Developed and created several microservices using Lumen framework.- Created a proxy for old (Zend) and new (Laravel) sites simultaneous authentication.- Added a SAML auth feature.- Created several front-end clients for microservices using Amber.js.- Configured Nginx for two different sites on one domain. Added switching between site using cookies.- Configured Sphinx for a fast text search microservice. Modified Laravel's MysqlConnection class for better Sphinx compatibility.- Optimized several MySQL procedures. Result: more than 2 times faster execution time on the same data.- Migrated all microservices to a separate Docker container.

- Refactored several modules and improved software stability and performance.- Created a reporting module with exportation to PDF.- Integrated with the HelloSign eSignature API.- Created parser for adding new clients from e-signed documents to a BailBinder CRM.- Created an invoice-generating system.

- Supported the CPA network by fixing bugs and writing new modules.- Provided time estimates for tasks.- Developed unit tests using PHPUnit and Codeception.- Created a high load back-end for mobile applications using Nginx and Lua.

- Provided time estimates for potential projects and tasks- Recruited and trained new developers- Reviewed Code of junior developers- Led the team of 6 in-house developers- Managed outsource developers- Led technical expertise to the tech writers- Developed and integrated time management system- Managed automation of the billing system (1C synchronization)Transferred projects to Symfony 2

- Participated in negotiations and presentations to clients- Created different Bash scripts- Managed Apache2/Nginx configuration- Optimized multiple SQL queries- Created API for money transfer system API update- Maintained company's old services (Postgres, Smarty, PHP4)Technologies: Oracle, PL\​SQL, PHP5, Symfony 1.4

- Created Business logic and mechanics of SMS services and promotional campaigns using Oracle, PL\​SQL.- Created APIs for external websites using custom PHP framework.- Developed promotional websites using PHP5, JQuery.