Interim Full stack backend developer

Interim
Engineering
Rotterdam
HBO
Engineering

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Highlights

Opdracht is Wet DBA-proof
Eenvoudig self-billingproces

Vacancy overview

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Your role as Interim Full stack backend developer

As a Software Engineer in the Developer Portal team, you’ll help shape the backbone of KPN’s developer experience. You’ll design, build, and maintain reliable, high-performing backend services and APIs that connect KPN’s internal and external ecosystems — from customers and suppliers to partners and developers. You’ll work in a modern cloud-native environment with .NET and Python, using event-driven and microservices architectures to deliver scalable and secure solutions.

You take ownership from design to deployment, value clean code and automation, and enjoy contributing to both the architecture and culture of your team.

More about your position

This is your team

You’ll join an international team of 13 professionals — front-end and backend developers, API experts, and cloud engineers — all dedicated to making KPN’s developer experience seamless and powerful.
We collaborate closely, using Agile/Scrum principles and working two days a week from our Rotterdam office. Autonomy, trust, humor, and shared responsibility define our way of working.

We take pride in solving complex challenges while keeping the atmosphere open and supportive.

All benefits

What will you bring us?

We’re looking for a passionate engineer with a strong technical foundation and a collaborative mindset.

You bring:

5+ years of professional software development experience
Solid understanding of OOP, clean code, and design principles (SOLID)
Experience with microservices and event-driven architectures
Hands-on skills with CI/CD, Docker, and Infrastructure as Code (IaC)
Familiarity with REST APIs, OpenAPI/Swagger, and OAuth2

Nice-to-have experience with AWS, Python/Django, or .NET Core? Even better.

All requirements

What will you get from us

Apply before: November 19th 17:00
Starting date: december 1st 2025
Contract untill: june 1st 2026
Hours per week: 36
Rate: maximum €89,00 (including travel expenses, excl BTW)

Wil je meer weten? Neem contact op met onze recruiter Antoine van der Maas via 06 – 30167124 of antoine.vandermaas@kpn.com.

All benefits

What happens after you apply?

01

You apply

Is this job opening your dream job? Thank you for applying. We will receive your application and contact you soon.

02

Phone call

We'd like to get to know you better. We'll schedule an initial meeting. One of our recruiters will contact you by phone.

03

Second interview

Both sides still satisfied? Then a second interview will be scheduled.

04

Welcome to the team

Welcome to KPN. Today starts your induction program.

Interested? Send us your application!

Apply through the form

Can I help you?

Antoine van der Maas

Recruiter

antoine.vandermaas@kpn.com

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