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Jannink IT

Software architecture for systems that have to keep working.

Niek JanninkPrincipal Software Engineer, Software Architect, Cloud Architect

For more than 20 years I have designed and built long-lived platforms in energy, medical devices, defence and government, from the architecture down to the code.

Start a conversation See selected work
Availability
Freelance, part-time, 2⁠–⁠3 days a week
Location
Remote, or on-site in Twente
Core stack
C# / .NET · Azure · Blazor · React · Python · Unity

Clients and engagements

  • Energy & geoscience

    • Quantico Energy Solutions
    • BaselineZ
    • Shell & Baker Hughes

  • Healthcare

    • Nucletron
    • Elekta

  • Defence & government

    • Royal Dutch Army
    • Municipality of Enschede

  • Industry & non-profit

    • PANalytical
    • NTFU

Three ways to work together

Through Jannink IT, my independent practice since 2012.

  • Architecture & technical direction

    Roadmaps, architecture reviews and migration plans for platforms that have outgrown their first design, with security designed in, aligned with SOC 2.

    • Architecture roadmaps
    • Legacy and fat-client migration
    • SaaS and on-premises design
    • Security & SOC 2

  • Hands-on engineering

    I write the production code myself: back ends, front ends, desktop and XR clients, and the pipelines that ship them.

    • .NET / C# and Azure
    • Python / FastAPI
    • Blazor, React, WPF
    • Unity for XR

  • Technical leadership

    Technical lead and Scrum Master for multidisciplinary teams. I mentor engineers and set up repositories where AI coding agents ship tested changes.

    • Tech lead & Scrum Master
    • Mentoring
    • Agentic workflows
    • Delivery in small steps

Deep in the Microsoft stack, broad beyond it.

C# since the first .NET beta in 2001 and Azure in production, with Python, React and Unity where the problem calls for them. Nine areas, each backed by the engagements behind it: Software Architecture, Agentic Software Design, Cloud Architecture & Azure, .NET & C#, Full-stack Development, Enterprise Integration, XR, VR & AR, DevOps & CI/CD, Technical Leadership.

All expertise

Long-lived platforms in energy, healthcare and defence

All work
Energy and mining

BaselineZ2018 – present

BaselineZ, a 3D geoscience and VR platform

Principal technical owner of a cloud-native and on-premises 3D geoscience platform that delivers subsurface models to desktop, web, immersive rooms and XR headsets.

  • C#
  • ASP.NET
  • Blazor
  • WPF
  • Unity
  • Azure
  • Docker
Energy

Quantico Energy SolutionsMay – Nov 2026

Modernising an ML-driven subsurface platform

Principal engineer on QEarth and QLog, the seismic, well-log and real-time drilling workflows that energy operators run on Quantico's machine-learning platform.

  • Python
  • FastAPI
  • React
  • TypeScript
Medical devices

Nucletron and Elekta2002 – 2007 · 2013 – 2014

Brachytherapy planning software and DICOM connectivity

Medical-device software for oncology departments, from a shared patient-administration and DICOM library to the modernisation of the brachytherapy treatment-planning application.

  • C#
  • .NET
  • C++
  • MFC
Defence · GIS

C2SC, Royal Dutch ArmyJun 2009 – Jan 2013

GIS for the Royal Dutch Army's staff information system

Geographic display of the field situation (maps, positions, troop coordinates) for the next generation of ISIS, the Royal Dutch Army's Integrated Staff Information System for officers at base sites.

  • C#
  • .NET 3.5
  • WPF
  • GIS

How I work

I look for solutions that respect the customer's wishes, the deadline and the long-term sustainability of the result, and I don't avoid the hard decisions or the tedious tasks when the project benefits from them.

Own the whole system
Architecture decisions only hold when the architect also lives with the code. I stay hands-on, from the database schema to the deployment pipeline.
Improve while shipping
Most platforms I work on are years old and in production. I reduce technical debt step by step, without stopping the delivery of new functionality.
Secure by design
Tenant isolation, ownership checks and audited controls are part of the architecture from day one, not a phase at the end.
Agents write, tests decide
I work agent-first, with clear repository context and test gates, so AI coding agents speed up delivery without lowering the bar.

Have a platform that needs to last? Let’s talk about it.

I reply within one working day. The first call is a free, no‑obligation 30 minutes.

Start a conversation info@jannink-it.eu

Niek Jannink

Part-time, 2⁠–⁠3 days a week

Remote, or on-site in the Twente region