Vadym Y.

Senior Software Engineer @ umnify GmbH

About

Backend Developer | PHP, Yii2, Laravel, JavaScript | High-Load Systems, Microservices, API Integrations, AI Automation I'm a backend developer with 8+ years of experience building and optimizing high-load systems using PHP, Yii2, Laravel, JavaScript, MySQL, PostgreSQL, Redis, and Elasticsearch.For the last 6 years, I’ve been working in a product company, focusing on performance, scalability, and improving the overall reliability of backend services.I design and refactor backend architecture, reduce MySQL load, introduce caching layers, and improve client–server communication. I’ve implemented WebSocket-based real-time features and migrated large production systems to PHP 8.3, significantly improving execution time and stability.In recent years, I’ve been actively integrating AI into backend systems:• building internal tools powered by OpenAI API for email automation and data extraction;• creating workflows that combine traditional backend logic with LLMs for response generation, classification, and process automation;• designing AI-assisted features that enhance user experience and reduce manual work.I enjoy technically challenging work — performance tuning, distributed systems, smart automation, and designing features from scratch. I collaborate closely with cross-functional teams, contribute at the conceptual level, and help shape solutions that directly impact product growth.I'm looking for opportunities where engineering quality, innovation, and long-term architecture matter.

Country

City

Ukraine

Industry

Computer Software

Skill

Разработка ПО как услуга (SaaS), ООП, Веб-службы RESTful, SQL, no sql, Веб-разработка, AWS, PostgreSQL, Laravel, Искусственный интеллект, PHP, JavaScript, jQuery, MySQL, Git, Linux, Photoshop, Bootstrap, CSS, HTML

Experience

Senior Software Engineer

umnify GmbH

2025-5 - Present · 1 yr 5 mos

As a Senior Software Engineer at Umnify, I focus on backend architecture, performance, and reliability of a SaaS platform in the customer engagement domain. Key responsibilities and contributions: - Designing and developing backend services in PHP (Laravel / Yii2) with a strong focus on scalability and clean architecture. - Improving system performance through query optimization, caching strategies (Redis), and refactoring legacy code. - Integrating AI/LLM-based features into existing workflows (automation, content generation, intelligent responses). - Working with message queues, background jobs, and async processing for high-load scenarios. - Participating in architectural decisions, technical planning, and code reviews. - Collaborating closely with frontend and product teams to deliver complex features end-to-end. Tech stack: PHP, Laravel, Yii2, MySQL/PostgreSQL, Redis, Elasticsearch, JavaScript, OpenAI API, AWS, Docker

Software Engineer

BHM GROUP

2018-11 - 2025-5 · 6 yrs 7 mos

Kiev Region, Ukraine

As a backend developer at BHM, working on the Umnion (app.umnion.com) project, I focused on improving server performance and enhancing system reliability. I implemented several significant changes and improvements, including: - Microservices Architecture: Introduced a microservices approach, allowing for efficient separation of functional modules, improving scalability, and ensuring more flexible support and development of the product. - Elasticsearch for Full-Text Search: Integrated Elasticsearch to enable high-performance search across large datasets, optimizing database interactions and reducing response times. - WebSockets for Real-Time Updates: Developed and implemented a WebSocket-based solution, enabling instant communication between clients and enhancing user interactions without requiring page reloads. - Migration to PHP 8.3: Successfully migrated the project to PHP 8.3, resulting in improved performance, security, and a roughly 30% reduction in script execution time.