Senior Java Backend Architect – Kafka-Driven Microservices

Sii Poland; Bydgoszcz; On-site; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Great Place to Work

Profit sharing

Centre of internal trainings

Many experts you can learn from

Open and accessible management team

Regular integration events and trips

MySii app

Medical care

Job summary

Sii Poland in Poland seeks an experienced Senior Java Developer to join a team building a modern enterprise data integration and processing platform. You will develop scalable backend services, microservices, and event-driven integrations, modernizing legacy applications in line with Domain-Driven Design and cloud-ready solutions.

You will actively participate in architecture discussions, contribute to technical decisions, and use Apache Kafka to enable efficient data processing across

Qualifications

• At least 10 years of commercial software development with Java backend focus.
• Strong production experience with Apache Kafka.
• Experience designing and building microservices and event-driven architectures.
• Experience with distributed systems and enterprise integrations.
• Ability to contribute independently to technical design discussions.
• Excellent English communication in an international environment; residence in Poland.
• CCDAK certification is required or in hand.

Responsibilities

• Design, develop, and maintain scalable backend services and microservices using Java and Spring Boot.
• Implement event-driven data-processing solutions based on Apache Kafka.
• Build enterprise integrations between internal and external systems via APIs, messaging, and asynchronous communication.
• Participate in technical design and solution architecture discussions.
• Support modernization of legacy applications into scalable, cloud-ready solutions.
• Monitor, troubleshoot, and optimize performance across distributed environments.
• Collaborate with developers, architects, and stakeholders on data integration initiatives.

Skills

Java backend

Apache Kafka

Microservices

Distributed systems

Technical design

English communication

Education

CCDAK certification

Job description

Sii Poland in Poland seeks an experienced Senior Java Developer to join a team building a modern enterprise data integration and processing platform. You will develop scalable backend services, microservices, and event-driven integrations, modernizing legacy applications in line with Domain-Driven Design and cloud-ready solutions.

You will actively participate in architecture discussions, contribute to technical decisions, and use Apache Kafka to enable efficient data processing across