Senior Java Backend Engineer at 1GLOBAL

Location: Warsaw, Masovian Voivodeship
Level: Senior
Posted: Jun 30, 2026

Description

1GLOBAL is seeking a senior Java backend engineer to design, build, and maintain scalable backend services for their eSIM, global connectivity platform, and IoT solutions. The role involves modernizing existing systems, developing new services, and improving overall platform reliability and performance. This position requires collaboration with a team lead and participation in agile processes.

Required Skills

Java
Spring Framework
Hibernate/JPA
Apache Kafka
RabbitMQ
Redis
PostgreSQL
MySQL
Amazon Web Services
Docker
Kubernetes
Git
Maven
CI/CD

Additional Information

Required Previous Experiences: 5+ years of professional experience in Java backend development
Experience working with production backend systems
Preferred Qualifications: Solid understanding of REST APIs, databases, and messaging
Experience with unit, integration, and e2e testing
Familiarity with CI/CD pipelines and modern development workflows
Experience working with Git, Docker, and Kubernetes-based environments
Good understanding of cloud services and scalable infrastructure
Ability to work independently and take ownership
Fluent English (spoken and written)