# Coders Group — codersgroup.pl

> Coders Group is a software development consultancy founded by Michal Ploneczka in 2013. We build custom applications with PHP, Symfony, and Go, and develop open-source n8n community nodes for Polish government and business APIs.

## Services

- Custom Application Development (PHP, Symfony Framework, Go)
- Workflow Automation with n8n
- Custom n8n Community Node Development
- Technical Consulting (architecture reviews, code audits, performance optimization)

## Open Source n8n Nodes

We maintain open-source n8n community nodes for Polish APIs, all published on npm under MIT license:

- **Biala Lista VAT** (`n8n-nodes-biala-lista-vat`) — Verify contractors on the Ministry of Finance VAT white list
- **KRS** (`n8n-nodes-krs`) — Query the Polish National Court Register for company data
- **CEIDG** (`n8n-nodes-ceidg`) — Query the Polish business registry (CEIDG) for sole proprietor data
- **VIES** (`n8n-nodes-vies`) — Verify EU VAT numbers via the VIES system
- **NBP** (`n8n-nodes-nbp`) — Get exchange rates from the National Bank of Poland
- **SMSAPI** (`n8n-nodes-smsapi`) — Send SMS messages via SMSAPI.pl
- **NFZ** (`n8n-nodes-nfz`) — Query the Polish National Health Fund API

### Installation

All nodes install via n8n's Community Nodes feature:
1. Go to Settings → Community Nodes in your n8n instance
2. Enter the package name (e.g., `n8n-nodes-biala-lista-vat`)
3. Click Install and restart n8n if prompted

## About the Founder

Michal Ploneczka is an engineering leader with 14+ years of experience. Currently Chief Development Officer at Linker Cloud (managing 25+ microservices) and owner of Coders Group. MSc Eng. from Silesian University of Technology (2004-2009).

## Contact

- Email: mp@codersgroup.pl
- Phone: +48 795 540 065
- LinkedIn: linkedin.com/in/michalploneczka
- GitHub: github.com/michalploneczka
- npm: npmjs.com/~michalploneczka
- Address: ul. Rybnicka 189, 43-176 Gostyn, Poland