Rakuten Cloud Platform Engineer Cicd Factory Department

**Job Description:** **About Organization** Rakuten Symphony is at the forefront of revolutionizing the telecommunications industry, building the future of mobile networks with innovative, cloud-native, and Open RAN solutions. Our mission is to empower operators globally to deliver cutting-edge services efficiently and at scale. **Job Duties** * **Kernel-Level Optimization:** Conduct deep-dive performance tuning (sysctl, tuna, /proc) to optimize RHEL for real-time (RT) workloads. * **RAN Workload Tuning:** Configure and tune vCU/vDU components, implementing CPU isolation (isolcpus), IRQ affinity, and NUMA alignment to achieve deterministic performance. * **Network Acceleration:** Optimize packet processing using DPDK and SR-IOV to bypass kernel bottlenecks for high-throughput RAN traffic. * **Advanced Troubleshooting:** Lead Root Cause Analysis (RCA) for high-severity incidents using advanced tracing tools (ftrace, trace-cmd, perf). * **Automation & Hardening:** Develop complex Ansible playbooks to automate kernel hardening and performance profile deployments across large-scale clusters. * **Lifecycle Management:** Manage vulnerability patching, OS upgrades, and hardware-software interaction (Intel RDT, CAT, BIOS-level tuning). * **Virtualization:** Expert management of KVM/QEMU, Red Hat OpenShift Virtualization, and containerized vDU pods within Kubernetes. Technical Skills & Tools * **Core:** Kubernetes, Linux (RHEL 8/9, Rocky Linux), Docker, Helm, Git * **Hardware:** Supermicro, Dell iDRAC, HP * **Automation:** Ansible, Python, Shell * **Monitoring/Diagnostics:** top, htop, vmstat, iostat, pqos, ftrace, perf * **Certifications:** RHEL, CKA (Certified Kubernetes Administrator) **Minimum Qualifications** * **Experience:** 8–12 years of relevant experience in telecommunications infrastructure engineering or SRE, with a proven track record in large-scale, complex environments. * **Kubernetes & Virtualization:** Deep knowledge of bare-metal Kubernetes deployments and virtualization in development/production environments. * **Networking:** Expertise in host-level networking, DNS/DHCP architecture, TLS management, load balancing, and advanced container networking. * **SRE Practices:** Proven application of SRE principles, including major incident leadership, capacity/scalability strategy, and advanced change management. * **Security:** Strong architectural knowledge of security hardening, RBAC models, pod security mechanisms, and secret management. * **Technical Depth:** In-depth knowledge of process scheduling (SCHED\_DEADLINE, SCHED\_FIFO), memory management, and I/O schedulers. **Languages:** English (Overall - 3 - Advanced)