Harmjan Willemsen

I'm a


photo of Harmjan Willemsen

IT Professional & Full-Stack Developer.

  • Name: Drs. H.J. (Harmjan) Willemsen MBA
  • City: Culemborg, The Netherlands
  • Email: Click here
  • Freelance: Parttime Available

I am a pragmatic, results-oriented IT professional with years of experience in designing, developing, testing and implementing information systems. I adapt easily to a new environment and can quickly add value. From my business economics and business administration background I have extensive knowledge of financial, logistical and administrative processes within organizations. Through my various assignments I have a lot of experience with ICT projects within information and knowledge-intensive organizations at the (central) government and at financial service providers.


Django, Django REST framework, FastAPI100%
HTML5, CSS3, Bootstrap80%
Javascript, JQuery, Ajax, React80%
SQL & Databases (SQLite, MySQL, PostgreSQL)70%
Git/GitHub, Visual Studio Code, Jira/Confluence, Swagger, Celery, AWS70%
Old school: Cobol/Cics, JCL, Adabas/Natural, IDMS, DB2, 80%





Open University Business School (UK)

Business administration (master)


Open University (Netherlands)

Business economics (bachelor)


Avans Hogeschool (Netherlands)

Bootcamp Full Stack Developer

December 2020 - Present


To educate myself as a developer in the modern development languages, I followed various 'specializations' via Coursera:

  • Advanced Django: Mastering Django and Django Rest Framework - this specialization covers everything from developing complex Django applications to the Django REST framework to task queues. These topics allow to create advanced websites that integrate with popular APIs and popular JavaScript frameworks, and provide in-depth knowledge of Django to tackle more specialized projects.
  • Django for Everybody - this specialization introduces Python programmers to building websites using the Django library. In four courses, students gain solid knowledge of HTML, CSS, SQL, Django, JavaScript, jQuery and JSON web services.
  • Web Design for Everybody: Basics of Web Development & Coding - this specialization covers how to write syntactically correct HTML5 and CSS3 and how to create interactive web experiences with JavaScript.
  • Applied Data Science with Python - this specialization focuses on developing data science skills using the Python programming language. The course teaches Python programmers to apply statistical techniques, machine learning, information visualization, text analysis and social network analysis techniques through popular Python libraries such as pandas, matplotlib, scikit-learn, nltk and networkx to provide insight into large amounts of data.
  • Python 3 Programming - this specialization teaches the basics of programming in Python 3.
  • IT Automation with Python - this professional certificate, developed by Google, is designed to provide IT professionals with in-demand skills like Python, Git, and IT automation.

Professional Experience

IT Professional

1995 - present

Various organizations

From the beginning of 1995 until now I have worked in ICT in various organizations as analyst, business consultant and project and information manager. In the first years I was employed by various organizations, from 2006 I am self-employed. Some examples of are:

  • Information Manager at Municipality of Amsterdam, DJI and Centraal Beheer Achmea
  • Business Consultant at Logius and UWV
  • Senior Advisor Information Management at NVWA
  • Senior Business Analist at Centraal Beheer Achmea
  • Program and Consulting manager at Oracle Netherlands
  • Senior Project Manager at Exact International
  • Program Manager Information Management at RIVM
  • Senior Manager at KPMG
  • Senior Consultant at MLC

Software developer

1988 - 1994

Various organizations

Worked as a (lead) developer for various organizations. Started as a systems analyst at bank Mees & Hope (MeesPierson) in combination with training courses from Volmac Top Trainings (CapGemini). During this period I was mainly involved in developing and maintaining information systems using Cobol/CICS and Adabas/Natural. Subsequently, as a developer at Itresco Consultants, I worked on the development of information systems in Cobol with DB2/IDMS as a database for, among others, Delta Lloyd (NN). Finally, as a developer at Pilot Software, I built information systems in 4-GL (fourth generation languages) for Heineken and Vopak.


Some examples of programs I have created as part of the Coursera specializations


Advanced Django




Web development


Advanced Python




Automation with Python