Senior Java Developer (Kafka)

💰 150-200 PLN/h net + VAT

 📝 B2B/UoP
📍 Warsaw | Hybrid model: 1 day per week from the office 

 

Join an international organization delivering a large-scale Big Data integration platform connecting systems across multiple countries within the logistics industry. This is a strategic migration and modernization initiative focused on building scalable, event-driven solutions that support critical business operations.

Your role

As a Senior Java Developer, you will be responsible for designing and developing backend services and integrations for a complex enterprise ecosystem. You will help modernize legacy applications, drive technical decisions, and build robust event-streaming solutions used across international markets.

Must-have skills

• 10+ years of experience in software development
• Strong expertise in Java 17+ and Spring Boot
• Very strong Kafka knowledge (must-have)
• Hands-on experience with Kafka Streams
• Experience building microservices and event-driven architectures
• Strong understanding of integrations, REST APIs, and messaging systems
• Experience with relational databases (PostgreSQL, MS SQL, Oracle)
• Kubernetes and basic DevOps knowledge
• Fluent English

Nice to have:

• Confluent Kafka experience
• Confluent Kafka Developer certification

What you'll do

• Design, develop, and maintain scalable backend services and integrations
• Build event-driven solutions connecting multiple enterprise systems
• Work on large-scale Big Data and data-platform initiatives
• Modernize legacy applications and migrate them to modern architectures
• Define technical solutions and contribute to architectural decisions
• Collaborate with product, business, and engineering teams
• Mentor less experienced developers and promote best practices
• Support production environments and ensure solution reliability

What we offer

• Long-term cooperation on a strategic international program
• Competitive rate up to 200 PLN/h B2B or employment contract
• Hybrid work model (1 office day per week)
• LuxMed and Multisport
• Opportunity to work with modern technologies including Java, Kafka, Kafka Streams, Kubernetes, and cloud-native architectures
• Real impact on the development of a global integration platform

Technology stack: Java 17+, Spring Boot, Kafka, Kafka Streams, REST API, Microservices, Kubernetes, PostgreSQL/MS SQL/Oracle, Git.