Senior DevOps Engineer

Who we are Upstream is a global leader in mobile marketing automation and digital service innovation, enabling Mobile Network Operators (MNOs) and brands to grow revenue, improve customer engagement and succeed in the digital economy. With over two decades of experience and operations spanning 45+ markets across Africa, Latin America, Asia, Europe, and the Middle East, we are a trusted partner to more than 60 MNOs worldwide. Headquartered in Athens, Greece, and with regional hubs in London, Dubai, Johannesburg, Lagos, São Paulo and Rio de Janeiro, Upstream combines global expertise with deep local insight. Our end-to-end approach encompasses strategy, creative development, technical deployment, campaign execution, and ongoing optimization, ensuring seamless, scalable, and performance-driven service delivery. About the role Help us define the future of our artifact and container-based deployment strategies. Evolve and support our immutable deployment platform. Develop applications and tools written in Python and Golang. Contribute in the design of high-volume, low-latency applications for mission-critical systems, delivering high-availability and performance. Design and implement on-premise and cloud infrastructure solutions on platforms such as VMWare, AWS, Azure. Optimize cloud infrastructure for cost, performance, and scalability. Develop and deploy Infrastructure as Code (IaC) using tools like Ansible and Terraform. Troubleshoot and resolve issues related to system performance, network connectivity, and security. Perform infrastructure upgrades, patching, and security hardening across systems. Adapt to and become part of a continuously evolving environment. Design and implement CI/CD pipelines using tools like Jenkins, GitLab CI/CD, or other similar tools to automate the build, test, and deployment processes. Enable developers to quickly build, bake, and deploy images either locally, on Kubernetes and to the cloud. Work directly with Upstream engineers to provide a polyglot-friendly experience and first-class support for platforms built on Java, Python, Go, PHP and others. Monitor the performance, availability, and security of our on-premise and cloud environments. Contribute to the development of tools for automating deployments, unifying platform metrics, reporting, and monitoring. Requirements 5+ years of hands-on experience in DevOps, Systems Infrastructure, or related engineering domains. Strong programming experience -- Python, Golang amongst others (both reading and writing). Linux experience -- knowledge on Linux system administration. Containerization & Orchestration -- hands-on experience with Docker, Kubernetes, container-optimized OS environments, and cloud virtualization platforms. Cloud experience -- designing and building tools and infrastructure for cloud platforms (e.g. AWS, Azure). Deep Knowledge on DevOps tools -- Ansible,Terraform, Helm, Jenkins, Gitlab, Grafana, Prometheus, Loki amongst…