Grzegorz SenetraGrzegorzSenetra

A dedicated store written from scratch without a framework, based on subscriptions, recurring payments and payment gateways.

• At Transmobil I build an e-commerce store based on subscriptions with recurring payments — a SaaS platform.
• I created the dedicated store from scratch without a framework.
• The store supports subscriptions, recurring payments and payment gateways using PHP, OOP, ORM, Moustache, jQuery, JavaScript, HTML5, CSS3 and Bootstrap 5.
• The store is integrated with KSeF, CRM and the telematics system.

• PHP
• OOP
• ORM
• Moustache
• jQuery
• JavaScript
• HTML5
• CSS3
• Bootstrap 5

A working KSeF module based on cron tasks, with monitoring, logs and full error handling.

• Transmobil's in-house CRM needed a working KSeF module.
• I created the KSeF module for the in-house CRM in PHP.
• The module is based on cron tasks and includes monitoring, logs and full error handling. It fetches and sends invoices, creates offline invoices and generates KSeF-compliant QR codes.
• The CRM has a working module for fetching, sending and creating invoices in the KSeF process.

• PHP

A WMS app for phones and data collectors that helps employees manage a warehouse.

• At Metalzbyt I created the Mobilny Magazynier WMS app for phones and data collectors.
• I created an application that helps employees manage a warehouse.
• Employees can find products by scanning barcodes, print labels, create order lists and import them into the ERP system.
• Mobilny Magazynier supports product lookup, label printing, order lists and ERP import.

• React Native
• Expo
• React
• Redux
• TypeScript
• Django REST Framework
• Python
• PHP
• ZPL II
• MSSQL
• SQLite
• MySQL
• Git

The site for Transmobil's KAS-accredited e-TOLL devices (ZSL/OBU) — end-to-end SEO, performance and security-header work; traffic roughly tripled.

• Transmobil sells KAS-accredited ZSL and OBU devices for the Polish e-TOLL road-toll system, but the product site — with sections on the system, products, a blog and contact — ranked poorly and needed a technical clean-up.
• I ran the technical side of the site end to end: SEO, performance, security, and the store integration.
• SEO from the ground up: unique meta titles and descriptions (30–60 characters), schema.org fixes for products and articles with ISO 8601 dates, a sitemap, canonicals, 301 redirects, a phantom-404 fix and image alts. Performance was driven with Google PageSpeed/Lighthouse via better image compression and resolution, topped with HSTS, X-Content-Type-Options and X-Frame-Options headers and a store integration.
• Within a few months traffic roughly tripled, and the site went from a technically neglected landing page to a fast, well-structured product site.

• PHP
• JavaScript
• HTML/CSS
• schema.org

The product site for the TACHO TRANSMOBIL system: remote DDD downloads, ITD violation analysis and work-time reports — with the same SEO and performance treatment as the e-TOLL site.

• TACHO TRANSMOBIL is a system for transport companies: remote DDD downloads from tachographs and driver cards, violation analysis for ITD roadside inspections, work-time and per-diem reports, the MDA app and support for second-generation smart tachographs. The product site had to present all of that clearly and rank well.
• I owned the technical side of the site: SEO, performance, security and multilingual support.
• The same playbook as the e-TOLL site: schema.org and Google Search Console, per-page canonicals, a sitemap, Google PageSpeed optimizations and Lighthouse audit fixes, plus security headers — with a focus on speed and the multilingual setup.
• A technically sound, fast product site that reports cleanly in Search Console and does the TACHO system justice.

• PHP
• JavaScript
• HTML/CSS
• schema.org

The Transmobil GPS-monitoring offer site — a template cut from scratch, product and blog sections, and Lighthouse optimization down to critical resource paths.

• Transmobil's GPS-monitoring offer is broad: trackers (including battery-powered ones), the TrackerGPS app, fuel and CAN-bus monitoring, eco-driving, temperature and cargo-space sensors, remote vehicle immobilization, and e-TOLL/SENT integration. It needed its own fast site to lay all of that out.
• I cut the template from scratch and built the site end to end: product sections, a blog, and the performance and accessibility layer.
• The site was built from the ground up with performance in mind: image compression, CSS/JS minification, critical-resource-path optimization for Lighthouse, and accessibility fixes — contrast ratios and image alts.
• A complete, fast offer site that walks a customer from trackers to the e-TOLL/SENT integration and rounds out the Transmobil landing family next to e-TOLL and TACHO.

• PHP
• JavaScript
• HTML/CSS
• schema.org

Software that extracts data from PDF invoices and imports it into ERP systems.

• As part of my freelance work, I created a PDF invoice parser.
• I created this software in Symfony PHP.
• The parser extracts data from PDF invoices and prepares it for import into ERP systems.
• Data extracted from invoices can be imported into ERP systems.

• Symfony
• PHP