Senior Java Backend & Kafka Architect

Sii Poland; Poznań; On-site; PLN 260,000 - 380,000; Full time

Benefits offered by this job

Great Place to Work

Profit sharing

Medical care

Centre of internal trainings

Regular integration events

Job summary

Sii Poland is seeking an experienced Senior Java Developer to join a team building a modern enterprise data integration platform. You will design and deliver scalable backend services, microservices, and event-driven integrations supporting global logistics processes.

The role emphasizes modernizing legacy applications, applying Domain-Driven Design, and contributing to architecture discussions. Strong Kafka production experience and English communication are essential in an international

Qualifications

• 10+ years of commercial software development with senior Java backend focus.
• Proven experience designing microservices and event-driven integrations.
• CCDAK certification is required.
• Strong English communication in international teams.
• Residence in Poland.

Responsibilities

• Design and build scalable backend services and microservices in Java/Spring Boot.
• Develop event-driven data integrations using Apache Kafka.
• Collaborate with architects on distributed system patterns.
• Modernize legacy applications for cloud readiness.
• Ensure reliability and performance across distributed environments.

Skills

Java backend development

Apache Kafka

Microservices architecture

Distributed systems

English communication

Poland residence

CCDAK certification

Tools

Apache Kafka

Kafka Streams

Kafka Connect

Kubernetes

OpenShift

Docker

Job description

Sii Poland is seeking an experienced Senior Java Developer to join a team building a modern enterprise data integration platform. You will design and deliver scalable backend services, microservices, and event-driven integrations supporting global logistics processes.

The role emphasizes modernizing legacy applications, applying Domain-Driven Design, and contributing to architecture discussions. Strong Kafka production experience and English communication are essential in an international