Publication
Jumpstart Your PHP Testing with Codeception
https://www.toptal.com/developers/php/php-testing-with-codeception
Vasily is available for hire
Hire VasilyVasily Koval
Verified Expert in Engineering
PHP Developer
Kyiv, Kyiv city, Ukraine
Toptal member since November 15, 2015
Bio
Vasily is a web developer with more than 20 years of extensive experience developing, optimizing, and supporting web applications. His main goal is to find solutions that meet all clients' requests with a focus on timely delivery. He also believes that accuracy and honesty are the keys to successful cooperation.
Portfolio
Just Eat Takeaway.com
GitLab CI/CD, Agile Software Development, Codeception, PHPUnit, Laravel...
Freelance
Vue, Laravel, PHPUnit, Git, CSS, HTML, MySQL, JavaScript, PHP, APIs, OpenAPI...
EAT.ch
PHP 7, MySQL, Laravel, Codeception, PHPUnit, Docker, Vagrant, APIs, OpenAPI...
Experience
- PHP - 15 years
- HTML - 10 years
- MySQL - 10 years
- JavaScript - 7 years
- Laravel - 6 years
- PHPUnit - 5 years
- Vue - 4 years
- Git - 4 years
Preferred Environment
Git, PhpStorm, MacOS
The most amazing...
...thing I've coded is a web-based system to collect and manage orders for a taxi service.
Work Experience
PHP Engineer
2020 - PRESENT
Just Eat Takeaway.com
- Refactored an old monolith back end written in pure PHP into microservices.
- Maintaining existing Laravel-based microservices: adding new features, monitoring and investigating logs and metrics, fixing bugs.
- Prepared a possibility to create, save, and then edit partners' delivery areas, both predefined and custom ones, along with delivery costs for each of them.
- Created and then optimized the endpoint in a Laravel-based application, which is returning a delivery cost for hundreds of partners from 300-400 ms to around 50-80 ms.
Technologies: GitLab CI/CD, Agile Software Development, Codeception, PHPUnit, Laravel, Helmfile, Docker, APIs, OpenAPI, Apache Kafka, Refactoring, JSON Web Tokens (JWT), PostgreSQL, Full-stack Development, Software Engineering, Microservices, Migration, Kubernetes, CI/CD Pipelines, SQL, Agile, Back-end, Software Development, Full-stack, Amazon S3 (AWS S3), Amazon DynamoDB, Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (SNS), Legacy Software, REST APIs, Code Review, Code Refactoring, GitHub Actions, Redis, Performance Optimization, Python, GitHub, Google Maps, Event-driven Design (EDD), Geospatial Data, CRUD, Memcached, PHP 8, OpenCode
Web Developer
2012 - PRESENT
Freelance
- Created and supported a project for photographers, operators, and other staff from one side and for people who need staff like that from other side. Implemented some interesting features such as uploading and transcoding video files to specific for web formats (WebM, MP4), memberships, payments, etc.
- Created online store based on OpenCart with the ability to export/import products for external systems, mass product/categories updates, viewing the group of products as one product, and multi-language support.
- Contributed to smaller jobs to update and fix existing Laravel- and OpenCart-based websites as well as create new ones based on Laravel/MySQL/Twitter Bootstrap, etc.
Technologies: Vue, Laravel, PHPUnit, Git, CSS, HTML, MySQL, JavaScript, PHP, APIs, OpenAPI, Refactoring, JSON Web Tokens (JWT), OpenCart, Full-stack Development, API Integration, SQL, Web Development, RESTFul APIs, Agile, Back-end, Software Development, Full-stack, Apache, Legacy Software, REST APIs, Code Review, Code Refactoring, Learning Management Systems (LMS), Performance Optimization, Python, GitHub, CSV File Processing, CRUD
PHP Engineer
2018 - 2020
EAT.ch
- Refactored old API back end written in Yii, into Laravel based application.
- Added various features like offers, vouchers, image optimization, and GeoSearch.
- Took care of reliability, deployments, and response time.
Technologies: PHP 7, MySQL, Laravel, Codeception, PHPUnit, Docker, Vagrant, APIs, OpenAPI, Refactoring, Full-stack Development, Kubernetes, CI/CD Pipelines, API Integration, SQL, RESTFul APIs, Agile, Back-end, Software Development, Full-stack, Legacy Software, REST APIs, Code Review, Code Refactoring, Performance Optimization, CSV File Processing, Geospatial Data, CRUD
PHP Developer
2009 - 2018
Dating Factory
- Created and updated features in admin panels: one for internal use and one for public use with the ability to configure websites, claims, view statistics, and more.
- Worked with server-side scripts like daemons, mass-update scripts, and API calls.
- Updated and maintained some secondary projects based on WordPress (including multi-site) and OpenX/Revive.
- Created and updated promotional tools (static and dynamic) and collected some usage statistics.
- Integrated external systems (such as tickets, payment, and tracking) via their API.
Technologies: jQuery, PHPUnit, JavaScript, HTML, PHP, APIs, API Integration, SQL, Web Development, RESTFul APIs, Agile, Back-end, Software Development, Full-stack, Apache, Legacy Software, REST APIs, CSV File Processing
PHP Developer
2007 - 2009
World Dating Partners
- Developed and updated admin panels with functionality to create and edit websites, customers, view reports, and configure the main system.
- Maintained WordPress-based blogs.
- Worked with server-side scripts like daemons, mass-update scripts, API calls, etc.
- Configured and sent big mailings, including checking the layouts, language, macros, and headers passed to email.
Technologies: Subversion (SVN), JavaScript, HTML, PHP, Software Development, Apache, Yii, CSV File Processing
PHP Developer
2003 - 2007
Donbass-Soft
- Created a simple internal web application for bug and time tracking.
- Created websites from scratch and based on osCommerce and xt:Commerce and Mambo/Joomla. Created templates, payment and shipping modules, calendars, modules to import and export products, etc.
- Worked on a system to create and manage events that is currently installed in over thirty locations in Europe and the US.
Technologies: Subversion (SVN), JavaScript, CSS, HTML, MySQL, PHP, Apache
Experience
Creative Empowering Solutions
I worked on internal sub-projects such as the registration wizard of several pages, cross-validation, and a JWT authentication server. Implemented the view, edit, and deletion of data that were entered in the system.
Labstep (via Toptal)
Worked to improve unit testing, added a Vagrant container to help new team members, and added/refactored a REST API to connect the front and back end.
Getdressed2 (via Toptal)
Updated OpenCart and fixed problems with the payment system and template.
Dating Factory
http://datingfactory.comA white-label platform to create and promote dating sites. Everything is prepared for success: cool templates, numerous features, and detailed statistics about hits, views, geo-searches, and a lot more.
Kronas.com.ua
OpenCart-based online store for a company which produces and sells furniture decorations. A lot of features were added to OpenCart: custom import, more statistics, DB optimization, grouped products, etc.
Educational Platform
• Supported an extended educational platform.
• Optimized both the back and front end.
• Implemented communication with external APIs like Stripe.
• Optimized database storage for better performance.
• Provided some manual testing.
• Optimized both the back and front end.
• Implemented communication with external APIs like Stripe.
• Optimized database storage for better performance.
• Provided some manual testing.
Broker Genius
https://brokergenius.ai/I contributed to a PHP-based system that monitors various APIs to get information in different formats, maps everything up, and saves it to a local projection database to have quick access to it. I used Laravel with DDD, Docker, and MySQL.
Education
1999 - 2004
Master's Degree in Computer Science
Donetsk National University - Donetsk
Skills
Libraries/APIs
Vue, React, OpenAPI, REST APIs, jQuery, Stripe API, Stripe, Google Maps
Tools
PhpStorm, Git, Jira, Apache, GitHub, GitLab CI/CD, Helmfile, NPM, Trello, Gulp, Vagrant, Sublime Text, Subversion (SVN), Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (SNS), OpenCode, Claude Code
Languages
PHP, SQL, JavaScript, HTML, CSS, PHP 7, Bash, Python, PHP 8
Frameworks
PHPUnit, Laravel, JSON Web Tokens (JWT), Codeception, Symfony, Yii, Laravel 5
Paradigms
Refactoring, Microservices, Agile, Code Refactoring, Event-driven Design (EDD), CRUD, Agile Software Development, Scrum
Platforms
OpenCart, Apache Kafka, Kubernetes, Docker, MacOS, Azure, Linux, Oracle
Storage
MySQL, PostgreSQL, Amazon S3 (AWS S3), Amazon DynamoDB, Redis, Memcached
Other
APIs, Web Development, RESTFul APIs, Code Review, Full-stack Development, Software Engineering, Migration, CI/CD Pipelines, API Integration, Back-end, Software Development, Full-stack, Legacy Software, Learning Management Systems (LMS), Performance Optimization, CSV File Processing, Geospatial Data, GitHub Actions
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