Rakuten Cloud Platform (RCP) Engineer (L3 / Infrastructure Specialist), CICD Factory Department (RS GSD Div)

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)