Особисті дані приховані

Vladyslav Rybalka · PHP Developer
[відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | t.me/vlad_rybalka

6 years of back-end experience in PHP/Laravel and Go, specializing in scalable systems, data migrations,
performance optimization, and complex integrations.
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Experience
Back-end Developer | AcademyOcean (Remote) | Apr 2022 — Present
●​ Developed and scaled a cloud-based SaaS LMS platform, improving performance and reliability, and owned
end-to-end features from requirements to production and post-release support.
●​ Introduced modular architecture, which accelerated feature delivery and reduced bug rate.
●​ Migrated statistics and analytics to ClickHouse + Go, optimized report time in 10x (from minutes to seconds) and
reduced load on the main database.
●​ Refactored a core legacy module with safe migration of millions of DB records, ensuring 0 downtime.
●​ Migrated terabytes of files from local storage to cloud with auto URL replacement and file checks, improving
scalability of the system.
●​ Implemented unified error handling and internal documentation standards, making collaboration between
front-end and back-end teams easier.
●​ Built AI assistants with multi-model support and prompt design, automated statistics analysis and content
generation.
●​ Participated in hiring and mentoring 2 developers (junior/middle level), conducted regular code reviews.

Back-end Developer | Master Service (Kharkiv, Ukraine) | Nov 2020 — Apr 2022
●​ Built a corporate financial accounting system used by 1,000+ employees, integrated with 1C, Bitrix.
●​ Designed and launched KPI dashboards for the sales department (50+ employees), displayed on office TVs.
●​ Applied DDD principles to complex domain logic, improved system structure and scalability.
●​ Implemented and maintained e-commerce platform for auto parts, built from 3 Laravel applications.
●​ Created unified auth and role management system across services (10k+ accounts).
●​ Developed migration adapters to transfer customer data from old DB, completed without errors or downtime
(100k+ clients, 1M+ records).
●​ Automated deployment and delivery with artisan and bash scripts, reduced feature release time by ~10.

Back-end Developer | IT Serve (Kharkiv, Ukraine) | Aug 2019 — May 2020
●​ Developed back-end and API for mobile apps of utility companies in several Ukrainian cities (100k+ users).
●​ Integrated LiqPay and Portmone payment systems, handling 1k+ transactions per month.
●​ Built async push notification system (Firebase) with audience segmentation and rules, sending 100k+
notifications at once.
●​ Refactored API to improve mobile release speed and reduce production defects.

Skills
Back-end: PHP, Laravel, Go, SQL (MySQL, PostgreSQL), Redis, ClickHouse, RabbitMQ, REST/gRPC/WS
Architecture & System Design: Design Patterns, Hexagonal, Microservices, Event-Driven, DDD, TDD
Front-end: JavaScript, TypeScript, Vue, Nuxt
Tools & Infrastructure: Docker, Nginx, CI/CD, Composer, Git, Jira, Confluence, Postman

Education Languages
Kharkiv National University of Radioelectronics ●​ Ukrainian (Fluent)
Sep 2016 — Jun 2020 | Faculty of Computer Science ●​ Russian (Fluent)
Bachelor's degree, Software engineering ●​ English (Pre-Intermediate)