Senior Site Reliability Engineer (SRE)

**About Us

1GLOBAL**  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 - 1GLOBAL 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, 1GLOBAL connects more than  70 million people and devices globally , enabling our customers to launch, scale, and innovate with confidence in the mobile ecosystem.

1GLOBAL 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 Koç and Pyrros Koussios, 1GLOBAL 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.

About the Team

We are looking for a talented  Senior Site Reliability Engineer (SRE)  to join our Technology Department. 

We are open to hiring this role in Berlin, Germany. 

As a Senior SRE, you will be a senior individual contributor responsible for strengthening the stability, scalability, and reliability of our global infrastructure and services across both cloud and on-prem environments. You will work alongside SREs under the guidance of the SRE Team Lead, taking ownership of critical reliability domains and helping drive a data-driven reliability culture based on SLIs, SLOs, and error budgets.

Your mission will be to proactively identify weaknesses across systems and improve reliability through redundancy testing, automation, and observability. You will design, build, and operate the tools and processes that automatically detect, prevent, and recover from incidents, ensuring our services remain reliable and performant for customers around the world. 

This role collaborates closely with DevOps, Infrastructure, IP Network, and Security teams to maintain carrier-grade reliability standards across all layers of our platform.

About the Role

• Act as a senior technical contributor within the SRE team, mentoring peers and setting the technical bar for reliability engineering.
• Define, measure, and maintain  SLIs and SLOs for core infrastructure and customer-facing services.
• Plan and execute  redundancy and resilience testing  across service, infrastructure, and networking layers — validating failover, HA configurations, and disaster recovery readiness.
• Design and implement  automated recovery mechanisms , self-healing workflows, and intelligent alerting systems.
• Drive  **incident response, root-cause analysis,