Personal information hidden

OLEKSANDR
KARAS
PHP Developer

DETAILS

Ukraine
[open contact info](look above in the "contact info" section)

[open contact info](look above in the "contact info" section)

SUMMARY

A motivated PHP developer with over 2.5 years of experience working with request-handling platforms
at a product company. I began my career in technical support, later served as the head of a hybrid
support team and a developer, and in 2026 transitioned fully to backend development. Implemented
revenue-generating features (loyalty system, OAuth, payment APIs), provided support for the admin
panel, and maintained a high level of test coverage using PHPUnit. Managed a small support team,
combining personnel management with active development.

EXPERIENCE

PHP Developer, Concert.ua
OCT 2024 — FEB 2026

Combined active backend development with leading a support team of 3 (hired and onboarded 2
specialists in 2025)
Built a loyalty certificate system that increased purchase conversion — owned feature end-to-end
from backend logic to admin UI
Built Google and Facebook OAuth 2.0 authentication from scratch, simplifying the user registration
flow
Investigated and resolved bugs in payment provider integrations (Platon, LiqPay), gaining working
knowledge of their APIs and transaction flows
Implemented new features within an existing event-driven architecture using domain events and
dispatcher patterns
Covered backend code with PHPUnit — unit tests (mocked) and e2e tests (full action, real data)
Worked with external partner APIs to automate data exchange and extend platform capabilities
Integrated Zammad ticketing into an existing Telegram bot and updated the Zendesk integration
within it
Resolved small Angular/TypeScript frontend bugs in the customer-facing storefront
Fixed and extended admin panel features used by internal operations teams
Technical Support Specialist, Concert.ua

OCT 2023 — FEB 2026

Track the current state of the system;
Temporary problem resolution with MySQL/PostgreSQL;
Problem investigation and escalation using databases and code (PHP/AngularJS);
Assist internal clients in working with the program;
Writing documentation for future employees in the same position;
Training interns on aspects of the job;
Providing sql samples for the business;
1.5 months of assistance to the testing department with current tasks while searching for a suitable
specialist (creating bug reports, searching for current bugs, regression testing after updates,
creating autotests using webdriver.io)

EDUCATION

Bachelor of Science in Computer Science, Sumy State University, Sumy, Ukraine

JAN 2019 — JAN 2023
Graduated with honours

Master of Science in Computer Science, Sumy State University

JAN 2023 — JAN 2025

SKILLS

PHP 7/8, Yii2, Laravel (basic)

PHPUnit, Unit tests, E2E tests

OOP, DDD

Event Driven Development

MVC/ADR

MySQL / PostgreSql

Terraform (basic); Docker (basic); Redis; Git, AWS (basic), Elasticsearch (basic)

HTML/CSS/JS, Angular (basic)

LANGUAGES

English Ukrainian