# Bahdan Hal — Consulting & Engineering Portfolio

> Senior Backend & Systems Engineer and Software Architect based in Gdańsk, Poland (UTC+1 / UTC+2).

## Profile Summary

- **Engineer**: Bahdan Hal
- **Role**: Senior Backend & Systems Engineer / Software Architect
- **Experience**: 5+ years building high-throughput distributed systems, modernizing large platforms, and architecting AI-assisted workflows.
- **Location**: Gdańsk, Poland
- **Languages**: English (Professional proficiency), Polish (Fluent), Belarusian (Native), Russian (Native)
- **Reputation**: Top Rated on Upwork · 100% Job Success · 28+ completed international contracts · 5.0 ★ rating

## Pricing & Engagement Terms

- **Standard Contract Rate**: €35/hour
- **Currency**: EUR
- **Contract Model**: B2B contract with EU/international invoicing
- **Billing Formats**: Transparent hourly tracking or milestone-based fixed scope

## Commercial Services

1. **Turnkey Websites & High-Performance Landing Pages**: Ultra-fast bilingual websites built with semantic HTML/CSS, robust backend, automated SSL, and 95-100 Google Lighthouse scores.
2. **E-Commerce & Online Stores**: High-converting webshops with PayU, BLIK, Przelewy24, Stripe, and InPost integrations, automatic invoicing, and sales dashboards.
3. **Client Portals, Dashboards & Custom Web Apps**: Role-based access control, interactive reporting, PDF generation, and background queue workers.
4. **AI Integrations & Custom MCP Tools**: Embedding Claude, OpenAI, and Gemini models with custom Model Context Protocol (MCP) servers for internal systems.
5. **Process Automation & API Integrations**: Resilient background pipelines, CRM synchronization (HubSpot, Pipedrive), and automated webhooks.
6. **Technical Audits, Speed Optimization & Production Rescue**: Database indexing and query tuning, Linux/Docker security hardening, PHP modernization, and emergency defect fixes.

## Key Technical Stack

- **Backend & Languages**: PHP 8.2-8.5, Symfony 6/7/8, Laravel 10/11, Python, TypeScript, Node.js, REST APIs, GraphQL, Model Context Protocol (MCP)
- **Databases & Caching**: PostgreSQL 14-17, MySQL / MariaDB, Redis, SQLite, Doctrine ORM, Eloquent, Index Tuning
- **Infrastructure & DevOps**: Docker, Docker Compose, Linux (Debian, Ubuntu), Caddy 2, Nginx, GitHub Actions CI/CD, Bash, SSH
- **Architecture**: Clean Architecture, Domain-Driven Design (DDD), Event-Driven Architecture, Microservices, PHPUnit, PHPStan Level 8

## Ecosystem Projects

- [Bahdan Hal Portfolio & Consulting](https://bahdanhal.pl/): Engineering portfolio, CV, commercial services, and contact intake.
- [IleZa.pl](https://ileza.pl/): Manual editorial fair prices for products in any category in Poland, plus a net salary/tax calculator.
- [StackHal](https://stackhal.com/): Online developer utilities (Caddyfile transpiler, Apple PKPass inspector, CIDR overlap matrix, SEO/GEO audit).

## Model Context Protocol (MCP) Access

- **Public Endpoint**: `https://bahdanhal.pl/mcp` (HTTP POST / SSE)
- **No authentication required for public tools**:
  - `get_portfolio_overview`: Overview of services, projects, rates, and tools.
  - `get_services_and_pricing`: Detailed catalog of all 6 services with deliverables and the standard hourly rate (€35/hour).
  - `get_cv_and_skills`: Complete CV, employment history (Web24, Freedom Mobile, GWO, Consulting), skills taxonomy, and languages.
  - `send_message`: Direct consultation inquiry, project proposal, or message submission.

## Full Documentation

- Complete CV, full service descriptions, and detailed background: [llms-full.txt](https://bahdanhal.pl/llms-full.txt)