Senior Backend / Full Stack Software Engineer | PHP · Symfony · Laravel · AI-assisted Engineering
I'm a software engineer with 14+ years of commercial experience building and maintaining business-critical web applications, enterprise systems and API integrations.
My strongest expertise is in PHP, backend architecture and database-driven applications, with extensive experience in Symfony, Laravel, JavaScript, SQL and Linux-based environments.
I particularly enjoy:
- Designing maintainable, well-structured backend systems and APIs
- Modernizing legacy applications and improving their architecture
- Building integrations between complex business systems
- Applying automated testing, static analysis and engineering best practices
- Exploring practical uses of LLMs and agentic AI in software products and development workflows
I'm currently combining my backend engineering background with LLM-powered applications, AI-assisted software engineering and Python.
An open-source PHP library for translating HTML with LLMs while preserving document structure and validity.
Available on Packagist:
composer require mtubis/html-translatorThe library supports OpenAI, Anthropic, Gemini and self-hosted models through a provider-independent architecture.
Key engineering aspects:
- HTML-aware segmentation and structure validation
- Provider abstraction built around PSR interfaces
- Translation profiles, glossary and terminology control
- Resilient handling of partial failures, retries and fallback strategies
- Caching, batching and token usage considerations
- Automated tests, static analysis and CI/CD
- Documented architectural decisions (ADRs)
Tech: PHP 8.4 · Composer · PSR-18 · PHPUnit · PHPStan · GitHub Actions · LLM APIs
The project is actively evolving toward a stable 1.0 release.
Backend & Architecture
PHP · Symfony · Laravel · REST APIs · SQL · DDD · SOLID · Clean Architecture · CQRS
Frontend
JavaScript · Vue.js · React · TypeScript · HTML/CSS
Databases & Infrastructure
PostgreSQL · MySQL/MariaDB · MS SQL · Redis · Linux · Docker · CI/CD
AI & Data
LLM API integrations · OpenAI API · RAG · Python · Pandas · NumPy
Engineering Practices
PHPUnit · PHPStan · Automated Testing · Code Review · Refactoring · Performance Optimization
I use AI coding tools as part of a structured, review-driven engineering workflow.
My approach includes plan-first task breakdown, project-level rules, reusable skills, MCP servers and specialized agents for implementation, testing, verification and security review.
Tools: Claude Code · GitHub Copilot · OpenAI Codex (exploring cross-model review workflows)
Architecture, correctness, maintainability and final engineering decisions remain human-owned.
- Polish — Native
- German — Advanced
- English — Professional working proficiency
Open to interesting software engineering opportunities, particularly in backend or full-stack development, system architecture, integrations and AI-powered applications.