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We are looking for a 5G Core System Engineering Lead to own end-to-end system design and interface definition for E-Space's satellite 5G Core network. This role sits at the architecture level: you will decompose requirements across the full core service chain, define interfaces and information flows at every boundary, and drive the trade-offs that are unique to a satellite operator — session continuity across dynamic links, SIM management, OSS/BSS, charging and policy, and subscription management for a globally mobile user base. You will translate those trade-offs into concrete architectural decisions and drive them to closure across software, platform, and back-end engineering teams.

What you will do:

• Own end-to-end 5G Core system architecture across the full service chain — AMF, SMF, UPF, UDM, PCF, AUSF, CHF, NEF — and produce architecture decision records (ADRs), system decomposition documents, and interface specifications that serve as the engineering source of truth.
• Define and own interface specifications at every core domain boundary: interfaces between network functions, Nx reference points, UPF-to-data-network anchoring, and integrations with back-end platforms including charging, billing, and SIM provisioning.
• Drive system-level trade-off analyses across competing constraints, latency-aware timer and retransmission parameter tuning, and complexity vs. flexibility trade-offs in policy and charging architecture.
• Analyse how satellite-imposed constraints propagate into core design decisions.
• Lead call-flow design for key 5G Core procedures in the satellite context.
• Define requirements and interface contracts for back-end platform integration: CDR generation and CHF interface, SIM provisioning and UDM data model, BSS/OSS integration points.
• Evaluate build-vs-buy options for core network functions and platform components; produce structured trade studies with quantified criteria covering performance, standards conformance, operational complexity, and cost.
• Define system-level acceptance criteria and performance benchmarks — session setup latency, registration success rate, charging accuracy, failover recovery time — and coordinate with the integration lab team to ensure test coverage matches architecture scope.
• Maintain alignment with 3GPP Rel-17/18 core specifications (SA2, SA5, CT4); identify where standard assumptions diverge from satellite operational constraints and drive resolution.

What you bring to this role:

Bonus points for the following: