Web application development.
Done right.

Hi, my name is Jan Pietras.
I'm a senior freelance PHP engineer based in the Randstad area.

Background

I started my career as a freelance developer in 2007. Nowdays I'm a senior PHP engineer and systems architect with 14 years of experience in PHP development and 11 years experience with symfony framework. During that time I've been able to get familiar with many different technologies and concepts for efficient and modern web application development.

I'm mainly a backend developer specialized in the creation of custom backoffice web applications and APIs. Some other areas I'm also very strong in include database design / complex queries, performance analysis and optimization, and system integrations.

On multiple occasions I've taken on roles as a full-stack developer. I'm comfortable with JavaScript and related frontend techonologies, application interface design, usability choices, and their impact on users. However for larger, more complex projects I do prefer to work together with specialists in design and frontend programming.

Even though I've always been technically inclined, I do have an academic background in Business Administration. I have worked and advised on optimizing processes and (management) reporting. This background enables me to not only focus on the technology but also to understand and help achieve business goals of a project.

I enjoy working for established companies with already set workflows, processes, and software architecture, but I also feel right at home in startups where new solutions need to be created from scratch in a dynamic environment. I can work either remotely or on location within the Randstad. I'm fluent in English, Dutch, and Polish.

Featured projects

Coca-Cola - Paydrink

Coca-Cola uses their Paydrink application to add mobile payments capability to existing vending machines. Originally developed to be used within one single country, soon after other divisions started showing interest in it as well.

I have been contracted to make the existing solution scalable and configurable for multiple European markets using the concept of multitenancy. By leveraging sound programming concepts and the functionality of symfony framework I was able to make the application ready for European rollout efficiently and whilst keeping each country's data separate and independent.

Comandi Management Dashboards

Comandi is a dashboarding application, developed be me from scratch into a fully featured SaaS application for a client. Many third-party systems can be connected to automatically fetch data and present it in various graphical interfaces for analysis.

Nowdays it is sold as a service used by more than 35.000 users, and executing 200+ million API calls every day.

Other projects

I was involved with a number of projects other than the ones featured above. A selection of these projects can be found on the projects page.

View other projects

Skills and experience

Backend

PHP7
Symfony (v1 - v5)
Doctrine
SQL
SOAP / REST APIs
Migrations
Profiling and optimization

Integrations

Facebook
Google (Maps, Analytics, Charts)
Financial systems (Exact, Twinfield, AccountView, Micros, Afas)
Klipfolio
ActiveCampaign
Many more...

Business

Online marketing
Cost/benefit analysis
IT consulting
Process optimization
A/B testing
Data analysis and reporting

Frontend

HTML5
JavaScript
CSS3
Twig
Bootstrap
jQuery
Usability

Concepts

MVC
OOP
Agile
Scrum
SOLID
oAuth

Software

PhpStorm
MySQL Workbench
Laravel Homestead
Git, Gitlab
JIRA
Ubuntu linux
Postman
WinAutomation