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Work experience

Fullstack-розробник

from 05.2014 to 12.2025 (11 years 8 months)
Medicosearch, Суми (Медицина, охорона здоров'я, аптеки)

​- Legacy System Modernization: Orchestrated a large-scale migration of a high-traffic monolith from Grails 1.3 to Grails 3.3, upgrading core frameworks (Spring, Hibernate) and resolving deep-seated technical debt to improve system performance and security.
​- High-Scale Data Management: Optimized and maintained a medical booking platform handling over 9.5 million appointments, ensuring high availability and ACID compliance for critical healthcare data under heavy concurrent loads.
​- Secure External Integrations: Developed a secure, embeddable booking widget for third-party platforms. Engineered an authorization layer that isolated sensitive user information (PII) from host domains, ensuring zero data leakage in cross-origin environments.
- ​Architectural Refactoring & Patterns: Refactored complex booking logic by implementing the Factory Pattern to decouple single and composite appointment types. This led to significantly higher code maintainability and reduced time-to-market for new business features.
​- Quality Assurance & Mentorship: Established a rigorous Code Review process, ensuring high coding standards across the team, reducing production bugs, and mentoring junior/middle developers in Groovy/Grails best practices.

Knowledge and skills

• Організованість
• Java
• Git
• Знання принципів ООП
• MySQL
• AngularJS
• Vue.js
• Nuxt.js
• Groovy