Senior Java Backend Architect - Global Connectivity

1global; Warszawa; Hybrid; PLN 260,000 - 400,000; Full time

Job summary

1GLOBAL, Warsaw-based, is seeking a Senior Java Software Engineer to join the Global Connectivity Platform. You will design, build, and maintain Java backend services, focusing on scalability, resiliency, and security within a fast-growing MVNO context.

You will contribute to architecture decisions, work on legacy modernization and greenfield initiatives, and collaborate in an Agile environment. Fluency in English is essential for collaboration with global teams.

Qualifications

• 5+ years of professional experience in Java backend development.
• Experience with production backend systems.
• 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).

Responsibilities

• Design, build, and maintain Java backend services.
• Contribute to architecture decisions with focus on scalability, resiliency, and security.
• Work on existing services, legacy modernization, and greenfield initiatives.
• Build and integrate REST APIs.
• Work with messaging systems and data stores.
• Advocate for clean code, testing, and maintainable solutions.
• Participate in code reviews and technical discussions.
• Collaborate closely with your Team Lead and peers.
• Work in an Agile, collaborative environment, contributing to planning and continuous improvement.
• Mentor other engineers when needed.

Skills

Java backend

REST APIs

Databases

Messaging

CI/CD

Git

Docker

Kubernetes

Cloud services

Ownership

English fluency

Tools

Docker

Kubernetes

Git

CI/CD

Job description

1GLOBAL, Warsaw-based, is seeking a Senior Java Software Engineer to join the Global Connectivity Platform. You will design, build, and maintain Java backend services, focusing on scalability, resiliency, and security within a fast-growing MVNO context.

You will contribute to architecture decisions, work on legacy modernization and greenfield initiatives, and collaborate in an Agile environment. Fluency in English is essential for collaboration with global teams.