Олег

Oleg Bartnichuk

Backend Engineer

Senior Backend Engineer with 9 years of experience in building and optimizing web applications. Focused on backend
architecture, performance, and scalable solutions. Contributing to system design, code quality, and development
processes. Leverages AI-assisted tools to improve productivity and delivery speed. Interested in growing into a Lead role
and driving engineering best practices.

SKILLS

• Technologies: Apache, AWS, Bootstrap, CakePHP, CI/CD, Composer, CSS, DigitalOcean, Docker, Git, GitLab CI,
Grafana, JavaScript, Laravel, Linux, MySQL, Nginx, NPM, Nuxt.js, PHP, PHPUnit, Prometheus, RabbitMQ, Redis, Vue.js,
Yii

• Key Skills: API Development, Application Architecture, Database Management, DDD, Design patterns, DRY, GRASP,
KISS, Leadership and Mentorship, OOP, Performance Optimization, SOLID

• Languages: English B2, Ukrainian (native)

WORK EXPERIENCE

Binotel 08/2023 - 03/2026
Senior Backend Engineer Kyiv, Ukraine

• Optimized application performance, reducing page load time from several seconds to milliseconds, significantly
improving user experience
• Refactored legacy codebase, reducing the number of production bugs and improving system maintainability
• Designed and developed a financial module from scratch, ensuring reliability and scalability of core business
processes
• Implemented a centralized logging system, improving monitoring and enabling faster issue detection and resolution
in production
• Contributed to the system architecture transformation by participating in the transition from legacy code to Domain-
Driven Design (DDD)
• Conducted internal workshops and training sessions on code quality and code organization, improving engineering
practices across the development team
• Managed production releases, ensuring stable deployments and minimizing downtime
TopDevs 11/2021 - 03/2023
Fullstack Developer Zaporozhye, Ukraine
• Took full ownership of the product development, leading both backend and frontend implementation
• Developed and maintained a streaming platform, ensuring system stability and continuous feature delivery
• Identified and resolved critical issues with video streaming reliability, significantly improving user experience
• Stabilized an existing application with frequent streaming interruptions, transforming it into a reliable production
system
• Collaborated with a product manager and QA engineer in a small cross-functional team to deliver high-quality
releases
• Contributed to user growth by improving platform stability and overall product quality
• Performed regular production deployments, ensuring smooth and consistent delivery of updates
Face IT 09/2018 - 09/2021
Fullstack Developer Zaporozhye, Ukraine
Worked across multiple projects in small cross-functional teams (2–7 people), covering the full development lifecycle
from presales to delivery and support.

• Conducted client interviews and requirements gathering to define project scope
• Estimated incoming projects and proposed suitable tech stacks based on business needs
• Developed and delivered features across diverse projects with varying technologies
• Performed testing and ongoing maintenance/support of delivered solutions
• Served as a direct point of contact with clients throughout the project lifecycle
Zengineers 03/2017 - 09/2018
First professional role, where I grew from Junior to Middle level. Started with CMS-based development and progressively
moved towards full backend development with Laravel.
Backend Developer Zaporozhye, Ukraine
• Developed plugins and custom components for CMS platforms
• Built applications from scratch using pure PHP
• Adopted Laravel and transitioned to more complex backend solutions

EDUCATION

Programming
Step IT Academy 01/2006 - 01/2008