Staff Software Engineer, Payments

The available sources do not contain information about the company name for rounx.com.; Netherlands; On-site; EUR 120,000 - 180,000; Full time

Job summary

rounx.com is seeking a Staff Software Engineer to shape the technical direction of our Payments platform. You will lead architecture decisions, design scalable backend services, and build distributed systems that impact merchant experience and business outcomes.

You will develop REST services within a microservices framework, drive initiatives across gateways and networks, and mentor senior engineers while collaborating with cross-functional teams to translate business needs into robust

Qualifications

• 10+ years of software engineering experience in distributed systems.
• Experience in payments or fintech is preferred.
• Proficient in Java or Kotlin with Spring Boot.
• Strong communication and stakeholder influence.
• Experience with cloud platforms and observability tools.

Responsibilities

• Lead architectural decisions for the Payments platform.
• Design and implement scalable backend services in a microservices setup.
• Drive initiatives across payment gateways and networks.
• Mentor senior engineers and collaborate with cross-functional teams.

Skills

Distributed systems design

Backend architecture

Java

Kotlin

Spring Boot

REST APIs

Kafka

Cassandra

Docker

Kubernetes

Cloud platforms (GCP/AWS)

Observability tools (New Relic/Datadog

Mentoring

Education

Bachelor's degree in Computer Science or equivalent

Tools

Java

Kotlin

Spring Boot

Kafka

Cassandra

Docker

Kubernetes

GCP

AWS

New Relic

Datadog

Job description

We are seeking a Staff Software Engineer to shape the technical direction of our Payments platform. The ideal candidate will lead complex architecture decisions, design scalable backend services, and build reliable distributed systems that directly impact merchant experience and business outcomes. Responsibilities include developing REST services and integration components within a microservices architecture, driving initiatives across payment gateways, card networks, and local payment methods, and collaborating with cross-functional teams to translate business needs into technical solutions.

The role requires 10+ years of software engineering experience, with proven expertise in high-volume distributed systems, preferably in payments or fintech. Proficiency in Java or Kotlin with Spring Boot, REST APIs, Kafka, and distributed data stores like Cassandra is essential. Experience with cloud platforms (GCP/AWS), Docker, Kubernetes, and observability tools such as New Relic or Datadoc is required. Strong communication skills and the ability to influence stakeholders are critical. Preferred qualifications include experience with payment gateways, card networks, local payment methods, and mentoring senior engineers.