Senior Java Software Engineer - Global Connectivity Platform

About Us 1

GLOBAL is a technology‑driven global mobile communications provider, delivering global connectivity solutions to enterprises and consumers. Powered by a best‑in‑class telecom platform – including its own owned and operated global mobile core network, fully fledged in‑house developed eSIM technology, and an extensive portfolio of telecom licenses – 1

GLOBAL operates as a fully regulated telecommunications provider across 40 countries worldwide.

We serve many of the world’s leading banks, enterprises, and digital‑first businesses, including neo‑banks, global fast moving consumer goods companies, travel leaders, and payment service providers. Today, 1

GLOBAL connects more than 70 million people and devices globally
, enabling our customers to launch, scale, and innovate with confidence in the mobile ecosystem.

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GLOBAL is a profitable, fast‑growing business. With full‑year revenues in 2025 exceeding US $200 million and profits of over US $25 million
, we generate strong cash flows to fund our growth, allowing us to continuously invest in infrastructure, platform innovation, and global expansion. Recent years have marked a defining phase in our journey, with major enterprise and mass‑consumer client wins accelerating our evolution into a global mobile connectivity powerhouse, purpose‑built to enable consumer brands to enter and succeed with their own aspirations to offer telecommunications services to their clients.

Founded in 2022 by experienced technology entrepreneurs, Hakan Koçand Pyrros Koussios, 1

GLOBAL has rapidly emerged as a European technology leader shaping the future of global telecommunications
. We operate as a fully regulated Mobile Virtual Network Operator (MVNO) in 12 countries and as a regulated telecom operator in an additional 28 markets. Headquartered in the Netherlands, with world‑class R&D hubs in Lisbon, Berlin, and São Paulo, our team of close to 500 experts across 15 countries is united by a single ambition: to redefine global mobile connectivity through technology, scale, and execution excellence.

This is a senior, hands‑on Java role focused on scalable backend systems, long‑term ownership, and real production challenges. You’ll join a new backend team in Warsaw working on the evolution of our eSIM, global connectivity platform, and IoT solutions.

The role combines:

• scaling and modernizing existing systems
• building new services and greenfield components
• improving reliability, performance, and maintainability across the platform

As a senior engineer, you’ll also contribute to introducing and evolving testing approaches as systems grow and change.

Our technology stack: Java 17 / 21, Spring / Spring Boot, Hibernate / JPA, Kafka, RabbitMQ, Redis, PostgreSQL, MySQL, AWS, Docker, Kubernetes, Git, Maven, CI/CD pipelines

Fluency in English is essential for this role; please ensure your CV is submitted in English as part of your application.

• 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

• 5+ years of professional experience in Java backend development
• Experience working 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)

• Growth Opportunities: Advance your career in one of the fastest growing telecommunications companies, expanding over 100% year‑on‑year…