Backend Product Engineer (Payments / Kotlin)
You’ll join a small, autonomous team where you’ll have true ownership over an internal product used every single day by users!
We usually respond within three days
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.
Rate: 150–180 PLN + VAT (B2B) per hour.
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 for the 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! 🚀
- Locations
- Łódź (Monopolis)
- Remote status
- Fully Remote
- Employment type
- Full-time
Łódź (Monopolis)
Why work with us
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You may hear it frequently from leaders at DNA that they would like to attract people smarter than themselves. Leaders at DNA feel responsible for creating an environment in which self-motivated people build teams that are able to create great things.
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The source of productivity comes from a team having clearly defined autonomy and responsibility, not from micro-managing people.
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We believe that diversity and psychological safety at work matter — we get proofs of that everyday.
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Usually, the problems we are trying to solve are complex (not complicated). Frequently, it means that we follow the Agile process and build our organisation according to the DevOps model.
Join a team with great autonomy and responsibility. The team discusses business priorities with the Product Owner, defines architecture, technology stack, way of working, takes pride in engineering craftsmanship and is end-to-end responsible for the solution.
About DNA Technology
As part of the Digital New Agency (DNA) group, DNA Technology is an experienced technology partner supporting clients in solving complex problems using software. Specializing in building teams that build digital products, DNA Technology is a long-term travel companion to startups and industry leaders. DNA offices are located in Stockholm and Łódź.
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