Web application development.
Done right.

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


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.

Skills and experience


  • PHP7
  • Symfony (v1 - v5)
  • Doctrine
  • SQL
  • Migrations
  • Profiling and optimization


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


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


  • HTML5
  • JavaScript
  • CSS3
  • Twig
  • Bootstrap
  • jQuery
  • Usability


  • MVC
  • OOP
  • Agile
  • Scrum
  • oAuth


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

Are you interested in working together? Let's get in touch!

You can reach me on Linkedin, email me at
or through Whatsapp at +31 641 147 853