NEW .NET Developer Transactions team – eMobility (SaaS)

Make sure every charging session gets paid for, correctly, every time!

About Deftpower

We make EV charging less annoying. Drivers find a charger, pay with one app or card across Europe, and charge at moments that are easier on the grid.

You won't see our name on that app. You'll see ANWB's, or one of the other brands we power. We like it that way: we'd rather make it work than make it loud.

Three e-mobility experts founded Deftpower, and they still run it. You can walk up to any of them, or to anyone else, with a question. Most people tell us they learn more from their colleagues here than from any course.

We're 120+ people now, with the energy of a team of 30. We'll keep growing, just more deliberately than before.

About the job

The team. The Transactions team is a team of backend developers and a tech lead. The team owns everything financial in the platform: invoices, payments, ledgers and reconciliation with every partner. You work most with your tech lead, our product owners and the operations engineers.

Why now? Every charging session on our platform ends in an invoice and a payment. As more drivers charge with more brands, that volume grows, and downtime is not an option. We need another developer to keep it reliable while we keep building.

What you do. You build and run the backend services behind every euro that moves through our platform. You decide how a feature is built and how we make it hold up at scale.

• Build invoicing, subscription and voucher features in C# and .NET

• Integrate payment service providers, including Deftpay, our own white-label payment provider

• Keep every ledger correct through reconciliation

• Strengthen fraud measures, such as reserving money before a charging session starts

  After six months. You've shipped a feature from shaping to production, for example in invoicing or subscriptions.
  

  For developers

  We work with Shape Up instead of Scrum: six-week cycles with a clear goal, and the team decides how to get there. An operations squad picks up the bugs, so you can focus on building.

  Must-have: C# and .NET, SQL (SQL Server / EF Core), Azure (Functions, Service Bus, Azure SQL), Git and pull requests, and curiosity about AI coding tools.

  Nice to have: Bicep, event-driven architecture, experience with payments or invoicing, and knowledge of EV charging.
  

  For you

  You get trust from day one. Contracts, roadmaps and numbers are open to you. You make the call, and you own it.

  You learn fast here. AI is part of every team's work, and feedback goes in every direction. Every quarter, we celebrate together at D-Day, the company day we work towards.

  It's not always tidy. We grew fast, and not everything is figured out yet. If that sounds like an opportunity, you'll fit right in.

  • 8% holiday allowance, 25 vacation days and a good pension

  • €2,000 training budget a year and your own choice of laptop

  • 40 hours a week, or 36 if you prefer

  • On average 2 days a week at the office in Arnhem
    

    About you

    • You have 3+ years of experience as a backend developer in C# and .NET, although attitude counts more than years

    • You care about getting the numbers right, because a small mistake here ends up on someone's invoice

    • You've built APIs and integrated them with external systems

    • You work in English every day. Dutch is nice to have
      

      This is for you if…

      ... you see a gap and plug it, without anyone having to ask.

      ... you say it when you disagree, and then you commit.

      ... change gives you energy. When plans shift, you shift with them.

      ... you share what you know and make your work visible.

      This is not for you if…

      ... you need a fixed plan before you start. Our plans change, and often.

      ... you wait for instructions.

      ... direct feedback feels personal to you.

      ... you want to work fully remote.
      

      Join Deftpower!
      

    • Intro call with People & Culture

    • Meeting with the Team Lead

    • Case of about one hour

    • Meeting our Head of Engineering

    • Offer

      You'll also do a short personality test, as a conversation starter. Once we're moving, we move fast.

      Want to plug some gaps with us? We'd love to hear from you.