Backend Product Engineer (Payments / Kotlin)

As a Backend Product Engineer, you will work on one of the most critical parts of our business — payment processing systems.

This is a highly business-oriented role. Payments are at the core of the company’s growth, and the stability, correctness, and scalability of this system have a direct impact on business results.

Location: Fully remote (Poland) 🌎 or Łódź (Poland)

Tech stack: Kotlin / Java, PostgreSQL, Kafka, AWS

Your everyday playground:

• Building backend features end-to-end — from clarifying business needs, through implementation and testing, to production.

• Working on real payment flows that are used every day and have a direct business impact.

• Cooperating with Product, other teams, and external partners to shape solutions together.

• Taking responsibility fort he quality and stability of systems running in production.

• Developing, integrating, and improving existing systems.

• Reviewing code and supporting teammates as part of a collaborative team.

• Working with technical and business documentation and turning it into working solutions.

• Running functional and manual tests of different card payment scenarios, including certification-related checks.

* The role combines software development and domain-focused work — roughly 50% development and 50% documentation, testing, and certification-related activities.

What are we looking for? 🕵️‍♀️

• Strong backend experience with Kotlin or Java (4+ years), including building and maintaining production systems.

• Solid understanding of relational databases and asynchronous, event-driven architectures.

• Ability to work independently with incomplete and evolving requirements, asking the right questions along the way.

• Strong sense of ownership and responsibility for what goes to production.

• Hands-on, critical mindset — you think through problems and solutions, not just implement tickets.

Bonus points:

• Experience with payment, fintech, or other regulated systems.

• Familiarity with PCI DSS–compliant environments or end-to-end certification processes (e.g. EMV L3).

• Knowledge of Spring WebFlux and Kotlin Coroutines.

Why join us? 🌟

• At DNA Technology, we believe in clear communication - we regularly talk about what works and what doesn’t, and how we can make things better (not just in code).

• Your development is extremely important to us! You can count on individual growth sessions to support you on your unique professional journey.

• We don’t do layers of management. Everyone has a voice and real influence on how we work.

Sounds like a fit? Let’s talk! 🚀