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About the Role
Serve as the principal technical authority and trusted advisor leading the end-to-end architectural design, validation, and commercial deployment of Cisco's 5G Standalone (SA) / Non-Standalone (NSA) Converged Core and Cloud-Native Network Functions (CNF). Bridge the gap between customer business objectives and technical delivery execution, owning high-level architecture, low-level parameters, end-to-end call flow design, and performance optimization for 5G Core network functions across bare-metal and containerized Telco Cloud environments.
Responsibilities
- Lead the architecture, design, and integration of Cisco 5G SA/NSA Core solutions, Converged Packet Core (vEPC / 5GC), and Control and User Plane Separation (CUPS) architectures for major Japanese telecommunications carriers.
- Architect high-throughput, low-latency 5G User Plane Functions (UPF) and Service-Based Architecture (SBA) control planes running on modern container platforms (Kubernetes / OpenStack / Bare-metal Telco Cloud).
- Define detailed signaling call flows, session management, policy control, charging (CHF/Diameter), subscriber data management, and network slicing across 3GPP (Rel 15/16/17) standards.
- Act as the lead delivery architect across the full project lifecycle (Plan, Design, Implement), directing lab staging, PoC benchmarks, migration strategies, operational runbooks, and real-time risk decision-making during high-stakes maintenance windows.
- Partner closely with telco engineering directors, CTO office stakeholders, Cisco Account Teams (AM/CSM), and specialist SEs to shape multi-year technology roadmaps and drive architectural evolution.
- Guide and mentor senior consulting engineers, drive delivery quality control, and collaborate with global development teams (Mobility BU / TAC) to resolve critical software and protocol roadblocks.
Requirements
- 8+ years of hands-on technical experience in Service Provider mobile packet core architecture, engineering design, or delivery (4G LTE EPC, 5G NSA/SA Core).
- Deep technical mastery of 3GPP mobile core protocols and interfaces: 5G SBA (HTTP/2, REST APIs, JSON), PFCP (N4/Sx), GTP-C/GTP-U, Diameter, RADIUS, and BGP/MPLS routing.
- Proven track record architecting or deploying core network functions: UPF, SMF, AMF, NRF, PCF, MME, SGW, PGW, and ePDG/N3IWF.
- Hands-on experience with Telco Cloud and virtualization platforms hosting VNFs/CNFs (Kubernetes, Docker, OpenStack, KVM, SR-IOV, DPDK/CNDP).
- Experience leading mission-critical network cutovers, major software migrations, and performance benchmarking for tier-1 telecommunications carriers.
- Native or business-level fluency in Japanese (client executive presentations, SOW scoping, and technical documentation) with professional working proficiency in English (collaborating with global BUs and international delivery teams).
Skills
- 5G SA/NSA Core
- Converged Packet Core (vEPC / 5GC)
- Control and User Plane Separation (CUPS)
- 5G User Plane Functions (UPF)
- Service-Based Architecture (SBA)
- Kubernetes
- OpenStack
- Bare-metal Telco Cloud
- 3GPP (Rel 15/16/17)
- Network Slicing
- Private 5G
- MEC (Multi-Access Edge Computing)
- IMS/VoNR architecture
- Python
- Ansible
- Terraform
- Linux shell tools
Location
- Japan
Work Type
- Full-time
Experience Level
- 8+ years of experience
Education Level
- CCIE (Service Provider / Enterprise Infrastructure)
- CKA (Certified Kubernetes Administrator)
About the Company
- Cisco's Customer Experience (CX) Professional Services is at the forefront of the global 5G revolution.
- We partner with Japan's tier-1 mobile network operators (MNOs) to architect, deploy, and optimize mission-critical 4G/5G mobile packet core networks and cloud-native mobile infrastructures.
- Our team combines deep 3GPP domain expertise with cutting-edge cloud-native platform engineering.
- We operate in a highly collaborative, fast-paced environment where we co-innovate with Cisco's global Mobility Business Units (BU), Centers of Excellence (CoE), and tier-1 service providers to deliver ultra-reliable, high-capacity, and low-latency mobile platforms supporting millions of subscribers.
- At Cisco, we’re revolutionizing how data and infrastructure connect and protect organizations in the AI era – and beyond.
- We’ve been innovating fearlessly for 40 years to create solutions that power how humans and technology work together across the physical and digital worlds.
- These solutions provide customers with unparalleled security, visibility, and insights across the entire digital footprint.
- Fueled by the depth and breadth of our technology, we experiment and create meaningful solutions.
- Add to that our worldwide network of doers and experts, and you’ll see that the opportunities to grow and build are limitless.
- We work as a team, collaborating with empathy to make really big things happen on a global scale.
- Because our solutions are everywhere, our impact is everywhere.
- We are Cisco, and our power starts with you.