Senior Java Engineer — Real-Time Fraud Data Pipelines

b2bnetwork; Warszawa; On-site; PLN 180,000 - 300,000; Full time

Job summary

b2bnetwork in Warszawa is seeking a Senior Java Developer (Kafka) to join a Fraud Management domain in a Scrum team. You will design, build and maintain near real-time data pipelines, interact with product owners, and ensure well-documented, maintainable solutions.

Strong Java, Spring Boot, Kafka, SQL/Oracle, and NoSQL experience required; prior microservices and messaging patterns are a plus. Join a dynamic team in Poland focused on robust data processing and scalable architecture in a modern

Qualifications

• Senior server-side Java development (Java EE / Spring Boot)
• Experience with performance analysis, profiling & optimization
• Knowledge of microservices and integration patterns
• Messaging technologies: Kafka
• Relational databases and SQL (Oracle or similar)
• Knowledge of NoSQL; Redis is a plus

Responsibilities

• Work as Senior Java Developer in Fraud Management domain.
• Collaborate with a Scrum team of developers.
• Contribute to solution design and maintainability of applications.
• Build and maintain near real-time data pipelines.
• Interact with product owners and stakeholders to clarify requirements.
• Document design and solutions with the team.

Skills

Java/J2EE

Spring Boot

Web Services/REST

Performance analysis

Microservices

SQL

NoSQL/Redis

Tools

Kafka

Job description

b2bnetwork in Warszawa is seeking a Senior Java Developer (Kafka) to join a Fraud Management domain in a Scrum team. You will design, build and maintain near real-time data pipelines, interact with product owners, and ensure well-documented, maintainable solutions.

Strong Java, Spring Boot, Kafka, SQL/Oracle, and NoSQL experience required; prior microservices and messaging patterns are a plus. Join a dynamic team in Poland focused on robust data processing and scalable architecture in a modern