Alexey Kopytko
Kobe, Hyogo Prefecture, Japan
Summary
🤩
RockstarAlexey Kopytko is an engineering leader and hands-on software engineer with 26 years of experience, based in Kobe, Japan, who codes alongside teams while cultivating genuine psychological safety to drive innovation. He’s fluent in PHP and Go and has a strong track record improving CI/CD, testing, and mutation testing—contributions that include work on well-known open-source projects like PHP-CS-Fixer and Infection. Colleagues rely on him to balance technical excellence with pragmatic delivery, breaking silos and aligning individual growth with team goals. He focuses on enabling engineers to take smart risks, grow technically, and convert ideas into production-ready features. Not obvious at first glance: beyond leadership he actively implements deep testing infrastructure improvements, from cross-version GitHub Workflows to custom mutators that raise code quality. That blend of senior mentorship and low-level engineering makes him effective in both startup and large-organization contexts.
26 years of coding experience
English, Russian, Japanese
Stackoverflow
30,013reputation
5.9mreached
264answers
38questions
mysql
top-5%
debugging
top-5%
code-coverage
top-5%
curl
top-5%
php
top-1%
printing
top-5%
Github Skills (25)
phpunit10
mutation-testing10
php10
mysql9
testing9
static-analysis9
code-standards9
printing9
test-framework9
astm9
debugging9
user-defined-function9
jekyll9
curl9
code-coverage9
Programming languages (15)
Github contributions (5)
infection/infection
Mar 2018 - Jan 2023
PHP Mutation Testing library
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:549 reviews, 231 commits, 498 PRs in 4 years 10 months
Contributions summary:Alexey contributed to the PHP mutation testing library by implementing new mutators, specifically for assignment operations and comparison operators. Their work involved the creation of new mutators like `AssignmentEqual` and `InstanceOf_`, improving the library's code coverage and mutation capabilities. They also contributed by adding tests and making changes to the code base such as adding a "yield" mutator and improving the quality of code.
mutation-testingphpmutationmutanttest-framework
PHP-CS-Fixer/PHP-CS-Fixer
Nov 2020 - Dec 2020
A tool to automatically fix PHP Coding Standards issues
Role in this project:Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:78 reviews, 8 commits, 10 PRs in 25 days
Contributions summary:Alexey primarily focused on improving the testing and CI/CD infrastructure of the project. They added GitHub Workflows for continuous integration, including testing across multiple PHP versions and operating systems. Additionally, the user contributed to code improvements, such as updating a PHPUnit test fixer and refactoring the testing setup to align with PHPUnit 9.x. They also made enhancements to the installation tests.
phpstatic-analysiscode-stylecode-standards
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