Senior Software Developer

Build software that matters. As a Senior Software Developer at Wispex, you will work on business-critical applications that keep international logistics moving. Combine hands-on development with technical leadership, influence architectural decisions, and help shape the next generation of our software landscape.

About Wispex

Founded in 1995 as a family-owned business, Wispex specializes in the handling of customs clearances and transit documentation for a wide range of clients. With a dedicated team of experienced customs brokers, transit specialists, and support staff, we ensure the timely and professional processing of various customs declarations across the Netherlands, Belgium, Germany, and the United Kingdom. As an active member of Fenex, we closely follow the latest developments in customs regulations and continuously adapt our services accordingly. Our rapidly growing client base includes both small and large, nationally and internationally renowned logistics service providers, importers, and exporters.

Our Company Culture

Although we are not physically involved in the logistics operations, we fully understand the critical role our services play within the logistics chain. Our “24/7 mindset” ensures that our clients’ shipments run smoothly around the clock. Our fast-growing customer base ranges from small to large national and international logistics service providers, importers, and exporters. You play a key role within this client base and our organization. As our client portfolio continues to expand, so does our organization. This provides ample opportunity for your own ideas, initiative, and contribution.

Your role as Senior Software Developer

We are looking for an experienced Senior Software Developer to strengthen our development team and take a technical lead role in projects and support the development of junior developers through coaching and mentoring.

In this role, you combine hands-on software development with ownership of the applications you build. You design, develop, implement, and maintain solutions that support complex, business-critical processes, with a strong focus on quality, continuity, and security.
Alongside development, you actively contribute to the growth of junior developers through coaching, code reviews, and knowledge sharing, helping to raise the overall maturity of the team.

You will help shape the next generation of our internal products. We are in an active transition from Windows-based applications to modern, web-based solutions, while continuing to support and improve a complex legacy landscape that is critical to daily operations. You will work on software that is used every day, where correctness, maintainability, and domain understanding truly matter.

This role offers the opportunity to build for the future, influence architectural decisions, and help guide the team towards more modern development practices. You will work closely with other developers, and IT stakeholders, reporting to the IT team manager.

What do you bring to the table?

- 5+ years of experience as a software developer
- Bachelor’s level of working and thinking ability, demonstrated through education and/or relevant professional experience
- Experience and strong interest in designing layered architectures (e.g. separation of UI, APIs, and business logic)
- Proven experience working in teams with junior developers
- Ability to analyse complex problems and translate them into clear solutions
- Patience and strong communication skills. Able to explain complex topics clearly
- High quality standards combined with a pragmatic mindset
- Sense of ownership and responsibility for both software and outcomes
- Team-oriented, proactive, and reliable

Must have

- Strong experience with C# / .NET
- Good understanding of Entity Framework and Microsoft-SQL.
- Strong understanding of modern software architecture principles and application design.
- Experience with in API-based architectures.
- Experience with scrum, code reviews, CI/CD pipelines, and version control

Nice to Have

- Experience with WPF, Blazor, web applications, or backend services.
- Experience working with legacy codebases
- Experience in regulated or process-heavy domains (e.g. logistics or customs)
- Proficiency in Dutch is a plus, as parts of our legacy codebase and documentation are in Dutch.

What do we offer?

- A market-competitive salary aligned with seniority.
- 25 days of annual leave based on full-time employment.
- A dynamic, international, and informal working environment.
- External training opportunities for both professional and personal development.
- Attractive secondary benefits, including a bicycle scheme, travel expense reimbursement, and a non-contributory pension plan.

How to apply

Interested in this position? Apply via the button below by uploading your CV and motivation letter. We will get in touch with you as soon as possible. If you have any questions about this vacancy, please contact [email protected] . Your contact person for this position is Robin den Buurman.