About Vadym
Senior Backend Developer and Software Architect with 9+ years of commercial experience specializing in high-load PHP applications. Expert in building scalable, maintainable systems using Laravel and Yii2.
My core focus is shifting complex monolithic applications towards modern architectural patterns to ensure long-term business growth.
Core Technical Stack & Expertise:
• Backend: PHP 8.x (Symfony, Laravel, Yii2)
• Architecture: Domain-Driven Design (DDD), Clean Architecture, CQRS, Hexagonal Architecture, Event Sourcing
• Data Isolation & Databases: PostgreSQL, MySQL, Redis
• DevOps & Infrastructure: Docker, CI/CD pipelines
How I can help your business:
- Designing and implementing robust backend architectures from scratch.
- Refactoring legacy codebases into clean, testable architectural patterns.
- Optimizing database performance and data isolation layers for high-traffic platforms.
Available for long-term remote B2B contracts within the EU.
English
Native or bilingual
Remote only
Primarily works remotely
Experience
- BHM MEDIA GROUP / Umnify GmbHSenior Software EngineerDIGITAL AND ITNovember 2019 - June 2026 (6 years and 7 months)Warsaw, Poland
- Performance Optimization: Drastically reduced PostgreSQL load and optimized server configurations (nginx as reverse proxy). Achieved a 40% reduction in database response time via deep execution plan analysis (EXPLAIN) and strategic indexing, translating complex technical bottlenecks into clear operational capacity risks for non-technical stakeholders.
- High-Load Processing: Engineered asynchronous workflows using Message Queues (adapted Redis-based solutions) to maintain system stability at 500+ RPS, ensuring high availability and performance.
- AI-Driven Development & Automation: Streamlined the SDLC by integrating Claude Code and developing 10+ custom engineering skills for automated refactoring and test generation, accelerating feature delivery (TTM) by 30%. Engineered a custom MCP (Model Context Protocol) server to expose platform infrastructure and APIs to LLMs, while integrating the OpenAI API to automate complex email processing and data extraction, reducing manual data entry by 80% with 98% accuracy.
- Scalable Architecture & API Development: Spearheaded the API development and architecture of robust backend services using PHP 8.3 (leveraging Laravel and Yii2 frameworks) and composer dependency management. Enforced Clean Architecture principles, reducing Time-to-Market (TTM) for new features by 25% through enhanced code maintainability.
- Infrastructure & Technical Leadership: Deployed and managed scalable backend services on AWS (EC2, S3) using Docker-based CI/CD pipelines. Conducted rigorous code review sessions to maintain high code quality standards and OOP principles. Mentored mid/junior developers and established comprehensive technical documentation, including API references and internal runbooks, to accelerate team onboarding and engineering efficiency.
- YouControlStrong Mid-End PHP DeveloperDIGITAL AND ITAugust 2018 - November 2019 (1 year and 3 months)Kyiv, Ukraine, 02000
- Data Integration & Parsing: Developed and maintained PHP-based parsers to collect and process data from various public registries and external APIs.
- Database Management: Optimized SQL queries and managed large datasets in MySQL to ensure fast data retrieval for analytical reports.
- Feature Development: Implemented new RESTful API endpoints for internal services, ensuring seamless data flow between system components.
- System Stability & Debugging: Owned the debugging and resolution of critical, high-priority backend issues in legacy modules. Diagnosed root causes of system failures under heavy loads, directly improving overall system stability and reducing application downtime by an estimated 15%.
- WebAppleJunior Full-stack DeveloperDIGITAL AND ITDecember 2017 - July 2018 (7 months)Cherkasy, Ukraine
- Full-Stack Development: Developed and supported web applications using PHP, JavaScript (jQuery), and Bootstrap, focusing on responsive UI/UX.
- Internal Tooling: Built and optimized administrative dashboards for content management, reducing manual data entry for the operations team.
- Code Quality: Participated in basic refactoring of legacy code and implemented unit tests to improve the reliability of core features.
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Education
- Master's Degree in MathematicsBohdan Khmelnytsky National University of Cherkasy2009Master's Degree in Mathematics