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September 22, 2026
Senior Java Developer (AWS & Kafka)
Senior • Remote
312,000 - 416,000 PLN/yr
Warsaw, Poland
Apply now
Quick Facts
- Remote (B2B), 0.5 FTE
- Senior backend role focused on AWS and Apache Kafka
Description
You will design, develop, and maintain scalable backend services modeling the client–vehicle relationship and integrating multiple client systems (including customer apps and CRM) in a complex integration environment. The core platform is Apache Kafka for real-time event streaming across large data volumes, with ongoing development of AWS-based solutions and cloud best practices.
Responsibilities
- Design, develop, and maintain scalable backend services
- Build and develop integrations between systems and applications
- Design and implement APIs
- Implement and evolve solutions based on Apache Kafka and event streaming
- Participate in architecture and system design decisions
- Develop solutions in an AWS environment
- Apply cloud best practices, including Infrastructure as Code and Cloud Security
- Collaborate with other teams and systems in the integration environment
- Deliver business solutions that can be effectively used from project start
- Work with the product team and stakeholders on service evolution
Requirements
- Very good knowledge of Java or Kotlin and Spring
- Minimum 6 years of experience in a similar role
- Experience with AWS
- Practical experience integrating APIs
- Hands-on experience with Apache Kafka (highly important)
- Experience with architecture and system design
- Knowledge of cloud best practices including Infrastructure as Code and Cloud Security
- DevOps mindset
- Experience delivering integration projects
- Independence, good communication skills, and ease working in a complex environment
- English knowledge enabling smooth daily communication in the team
Benefits
- No dress code
- Stable employment
- Opportunities to upskill
- Open and collaborative team culture
- Openness to employee initiatives
- Real impact on the product
Recruitment process
- Interview with a 4IT Solutions representative
- Technical interview with the client
- Additional client meeting
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