Back-end Developer

What is Twikey?

Twikey is a promising scale-up in the fintech industry with the ambition to play a leading role worldwide in automating payments from recurring customers. Twikey supports companies throughout the entire customer journey, from client identification and the signing of contracts and SEPA Direct Debits to the execution and follow-up of the resulting transactions. We are currently the only European player connecting with (almost) all major European banks.

Well-known players such as Q8, ANWB, 4411, Touring, Mediafin, Lizy, Belfius, Rabobank, … rely on Twikey. Our diverse customer base includes sports clubs, cleaning agencies, NGOs, schools, leasing companies, accounting firms and online shops, spread across Europe (Belgium, the Netherlands, Germany, France, Italy, ... ).

With our solutions we aim to make the world more efficient. Companies working with Twikey save their customers paper, time and needless trips. That is how we do our bit towards a sustainable, more CO₂ neutral world.

When building our team we attach a lot of importance to our company values. They make sure our diverse group of colleagues shares the same outlook on (working) life, forms a close-knit and well-cooperating whole and, of course, has a lot of fun.

Passion

Strive for innovation and growth

Trustworthiness

Build trust through integrity & transparency

Excellence

Perfection from within

Intrapreneurship

Act like a business owner, as if it were your own

The job

Every day, Twikey processes the recurring payments of thousands of companies: direct debits, card payments, payment links. Behind every transaction is a customer who counts on the money arriving correctly, exactly once and on time. That's the system you'll help build.

You'll work in a small development team on the core of the platform: 3 developers, 2 testers and a technical team lead who shields you from noise, not a manager layer. No tickets thrown over the wall: you design, build, help test and follow up in production.

What you'll work on

• Payments that must never be duplicated or lost. Retries, concurrent processing and external systems that don't always do what they promise: you make sure the outcome is still right.
• Integrations with banks, software houses and large companies. You build and maintain APIs and integrations, and give partners technical support during their integration.
• Growth. Volume goes up every year. You find the bottlenecks in queries, data model and processing before they become a problem.
• Production. When something goes wrong, you find out why, fix it and make sure it doesn't happen again. During working hours, that is: developers don't do on-call.

Our stack

Java, Spring and Go on Linux, PostgreSQL and a lot of APIs. We choose technology for what works, not for what's trendy. Got a better idea? We'd like to hear it.

How we look at AI

AI writes a lot of code these days, including at Twikey. What matters is whether you can judge if that code is right. You treat AI output like a pull request from a junior: read it, test it, question it. Only then does it go to production.

What are we looking for in you?

• You have several years of experience as a back-end developer with Java and Spring. Go is a plus, or you pick it up quickly.
• You understand databases (PostgreSQL, in our case): not just how to use them, but how they work. You know what a query does, when an index helps and where transactions begin and end.
• You understand concurrency and think in failure modes: what happens if this comes in twice at the same time, or fails halfway through?
• You've been through a production incident and can explain what went wrong, how you found it and what you changed structurally afterwards.
• You can name trade-offs and defend your choices. You can also tell us what you'd do differently today.
• You write code that is readable, testable and maintainable, and you like giving and receiving critical review.
• You work independently and take ownership, from design to follow-up in production.
• You're fluent in English. Dutch is an asset.
• You're based in a time zone within one hour of CET, so your working day overlaps with the team's for daily stand-ups and close collaboration.
• Experience with payments, banks or fintech is a plus, not a requirement. So is a degree: what you've built counts for more.

Twikey offers you:

• Direct impact on a product used daily by thousands of companies, in a small team where your ideas reach production quickly.
• The room to experiment, to challenge and to improve. And we expect you to really take that room.
• A competitive salary matched to your experience.
• More than 35 colleagues in an open culture of critical dialogue, and a monthly Friction Hunter Trophy for whoever made the biggest difference.

A job ad doesn't tell you everything: our colleagues tell you here what it's really like to work at Twikey.