Senior Full Stack Software Engineer

Senior Full Stack Software Engineer
Join us in building the platform that shapes the future of mobility transactions! As a Senior Full Stack Software Engineer, you enjoy solving complex technical problems, and you take a hands-on approach to the development of a growing platform.
At Mobility Concept, we develop software that enables organizations to manage mobility schemes, travel cards and payments within a rapidly growing network of providers. Our platform integrates with HR systems, payment networks and mobility providers to process travel and mobility transactions in real time.
In this role, you will design, develop, maintain and implement our .NET / Azure platform within the backend, front-end and cloud infrastructure, contribute to architectural decisions, review your colleagues’ work and mentor junior colleagues.

As a Senior Software Engineer, you will

Design and build new features for the backend, frontend and cloud infrastructure, as well as API integrations with third-party systems and payment providers
Write automated tests to validate and verify your results
Build CI/CD pipelines to automatically deploy our software
Work with product managers and partners to design features and integrations and expand our platform’s ecosystem
Continuously improve your AI skills and use them to optimise your own work, and share your insights to improve your colleagues’ work

Our platform is mainly built using

We constantly keep an eye on new technologies and adopt them pragmatically when they add real value.
A role offering a high degree of independence and real technical responsibility
The opportunity to shape the future architecture of our platform
A competitive salary in line with the market and your experience (€70k–€100k)
If you work full-time, you are entitled to 26 days’ annual leave
We have a hybrid working culture. This means you are always welcome at our office in Haarlem, but you also have the option to work from home several days a week
We provide lunch when you work at the office. Working from home? You get a work-from-home allowance
Every employee receives a second-class travel card. If you travel by personal means of transport, you will receive a mileage allowance. As we encourage climate-neutral travel, you will receive a higher allowance if you choose this option, for example by cycling to work
A pension scheme to which we contribute, and to which you can choose to make your own contribution
To support your personal development, we encourage you to take courses and training programmes

8+ years’ experience in building production-level software
Extensive experience with .NET, SQL Server and modern web technologies
Experience with Azure or other cloud platforms
Experience in designing and developing APIs and integrations
A desire to boost productivity by utilising new tools (e.g. AI)
A strong awareness of secure development practices
Dutch as your first language and an excellent command of English

You like to combine architectural thinking with hands-on development.

Experience in one or more of the following areas is an advantage

Software development in fintech, banking or payment systems
Building or scaling SaaS platforms
Migrating systems to public cloud environments
Integrating AI capabilities into software platforms

This makes the role interesting
Your work has an impact on tens of thousands of users and millions of transactions
You’ll be part of a small engineering team with a high level of autonomy, responsibility and modern working practices
You’ll be part of a process that’s optimized for meaningful work and hands-on contributions

Would you like to help shape the future of mobile payments? If so, please send your CV to . Do you have any questions first? Please contact for a brief chat and further information.
During the recruitment process, you will have three interviews so that we can get to know each other well. We start with an initial interview. This is followed by a technical interview with the engineering team and a final interview with management. If we both want to move forward, we will also ask you to provide a reference and a Certificate of Good Conduct (VOG).
Kinderhuissingel 1-E 2013 AS Haarlem