Ground Communications Software Engineer Lead - 5G Core

Integration delivery. Own integration architecture and delivery for back-end systems that interface directly with the 5G Core: SIM/eSIM provisioning, CRM, billing, online and offline charging, and device management. Resolve dependencies early and drive end-to-end interoperability across satellite and ground environments. 

SIM and eSIM provisioning. Define and implement integration between provisioning infrastructure and core subscriber management. Own subscriber profile delivery, remote SIM provisioning workflows, and profile lifecycle management across satellite and ground. 

CRM integration. Design and own the interface between CRM and the core network, including subscriber record synchronization, service entitlement and quota management, and real-time event delivery for customer-facing workflows. 

Billing and charging. Lead integration of the billing and charging stack with core charging interfaces. Deliver CDR generation and delivery, online charging authorization flows, and reconciliation between core charging events and BSS billing records. 

Device management. Integrate device management capabilities with core network functions, including device policy enforcement, configuration delivery, and status signaling across the satellite link. 

Interface contracts. Define API specifications, data models, and event schemas at each BSS/OSS-to-core boundary. Maintain these contracts as the engineering source of truth shared across core software and back-end platform teams, and drive interface decisions to closure. 

Integration verification. Build and maintain test harnesses for each BSS/OSS-to-core interface. Drive automation and define acceptance criteria for every interface at each release milestone. Track delivery and verify results before declaring an integration complete. 

Failure resolution. Own defect triage and root-cause analysis for integration failures at BSS/OSS-to-core boundaries. Communicate impact and blockers promptly, coordinate resolution across core software and back-end platform engineering teams, and verify fixes. 

Team delivery. Lead and mentor a small integration engineering team of 2–4 engineers. Set delivery cadence and engineering quality standards, make ownership and deadlines explicit, and follow through on commitments. 

Strong understanding of 5G Core subscriber management and the interfaces connecting BSS/OSS systems to the core, including authentication, session management, policy, and charging. 

Hands-on experience integrating SIM or eSIM provisioning infrastructure such as SM-DP+, SM-SR, or equivalent with mobile core subscriber management systems. 

Experience integrating CRM and billing platforms with telecom core networks, including service provisioning APIs, online and offline charging interfaces, CDR delivery, and event-driven subscriber data updates. 

Experience with device management integration in a mobile or IoT context, including policy enforcement, remote configuration, and status reporting over cellular. 

Strong API design and integration engineering skills, including REST and event-driven interface specification, data model design, and integration test automation. 

Experience leading small software integration teams with clear API contract discipline and release tracking. 

Experience with eSIM and remote SIM provisioning in a satellite or IoT connectivity context. 

Background in MVNO BSS/OSS integration, including multi-PLMN subscriber management, roaming data exchange, or MVNO billing stack integration. 

Familiarity with cloud-native core deployment and how containerized network functions affect BSS/OSS integration patterns. 

Experience in a startup or fast-paced R&D environment where integration scope expands rapidly. 

Prior work with government or defence connectivity platforms with BSS/OSS integration requirements.