SIM Management, 5G Core Engineer in Santa Clara, California at E-Space
Job Description
Ready to make connectivity from space universally accessible, secure and actionable? Then you’ve come to the right place!
E-Space is bridging Earth and space to enable hyper-scaled deployments of Internet of Things (IoT) solutions and services. We are building a highly-advanced low Earth orbit (LEO) space system that will fundamentally change the design, economics, manufacturing and service delivery associated with traditional satellite and terrestrial IoT systems.
We’re intentional, we’re unapologetically curious and we’re 100% committed to innovate space-based communications and deliver actionable intelligence that will expand global economies, protect space and our planet and enhance our overall quality of life.
We are hiring a SIM Management 5G Core Engineer to deliver reliable, scalable subscriber data management across our 5G infrastructure.
This is a hands-on engineering role for someone who owns design, and verify the configuration and integration of subscriber data management nodes(UDR / UDM), networks, and systems across our 5G infrastructure. You will introduce, upgrade, and expand cloud-native UDM and UDR platforms, support the convergence of subscriber databases as the platform evolves, and stay engaged until changes are validated and service issues are resolved.
Subscriber platform reliability. Manage and operate UDR and UDM nodes in the 5G Core domain. Maintain high availability and subscriber profile integrity, and verify configuration and integration across nodes, networks, and systems.
Provisioning and onboarding. Design and maintain subscriber provisioning workflows covering IMSI/MSISDN management, service profiles, and roaming configurations. Configure subscriber repositories, IMSI ranges, and roaming agreements to support onboarding.
Interface integration. Implement and verify HTTP/2-based interfaces, including N8 and Nudm, connecting subscriber data nodes to AMF and other core elements. Validate subscriber data exchanges and resolve integration defects.
Operational visibility. Use and build dashboards to monitor subscriber node KPIs. Surface abnormal conditions promptly and identify patterns before they become outages.
Incident resolution. Own incident management for the subscriber data domain. Follow internal escalation and external vendor communication procedures, coordinate recovery, and ensure SLAs are met.
Platform maintenance and security. Perform maintenance, security audits, patching, and emergency response for UDM/UDR platforms. Verify service health after changes.
Lasting corrective action. Handle faults at node, service, and infrastructure levels. Analyze HTTP/2 signaling with Wireshark and tcpdump, identify root causes, and verify corrective actions.
Platform evolution. Lead and contribute to end-to-end introduction of subscriber management nodes, capacity expansions, software upgrades, and feature activations. Track dependencies and validate functionality and capacity before closing the work.
Cross-domain delivery. Work with partner teams to resolve subscriber authentication and registration issues. Make ownership and next steps clear, escalate blockers early, and follow through on resolution.
Deep operational knowledge of HSS/HLR or UDR/UDM platforms, with hands-on configuration and troubleshooting experience.
Practical experience with 5G UDM and UDR, including cloud-native, containerized or Kubernetes-based network functions and HTTP/2 service-based interfaces: N8, Nudm_SubscriberDataManagement, and Nudr_DataRepository.
Solid understanding of 5GS subscription profile structures, IMSI/MSISDN range management, number portability (NP/MNP) integration, and SIM/eSIM provisioning workflows.
Working knowledge of 5G SA architectures, including AMF, SMF, UDM, UDR, AUSF, and UDSF, and their subscriber data flows.
Familiarity with 3GPP TS 29.503 and TS 29.504 for UDM/UDR service-based interfaces, and TS 23.502 for 5G procedures.
Comfort with Linux/Unix shells, log interpretation, process management, and basic system administration on telecom network function hosts.
Hands-on experience with Wireshark, tcpdump, and vendor-specific trace tools for analysis of MAP, Diameter, and HTTP/2 subscriber signaling.
Experience with active/standby configurations, geo-redundancy, and database replication and synchronization for highly available subscriber databases.
Familiarity with Kubernetes-based telecom platforms and Helm-based network function lifecycle management.
Experience with 3GPP NTN core adaptations in Releases 17 and 18, including satellite access node (SAN) architecture, timer and window parameter adaptation for high-latency links, or UPF placement in non-terrestrial topologies.
Background in MVNO core architecture, including roaming interfaces such as N32/SEPP and Diameter S6a/S9, multi-PLMN federation, MVNO interconnect, or eSIM/SM-DP+ integration.
Familiarity with 3GPP SA2/CT4 specifications or direct standards contribution experience.
Experience with NEF or network exposure APIs and B2B API gateway architecture.
Background in SIM provisioning platforms, subscription management, or UDM/HSS data modelling.
Experience in a startup or fast-paced R&D environment where architectural decisions move at product speed.
Passion, deep knowledge, and direct experience in LEO satellite component development, design, and in-orbit activities.
As a member of our team, you will play a crucial role in driving our success. Our team members have a strong sense of dedication and responsibility; this includes a strong commitment to our mission to create an entirely new suite of global capabilities to improve lives, business efficiencies and build a smarter planet. This means that there will be times when extra hours, including nights and weekends, may be needed to meet critical deadlines and mission goals. In return, we offer a dynamic work environment with opportunities for professional growth and development and the chance to make a meaningful impact in a high-growth industry.
We want you to make the most of your journey at E-Space. That’s why we support and invest in the physical, emotional and financial well-being of our team members and their families. Some of what you can expect when working at E-Space:
• An opportunity to really make a difference
• Sustainability at our core
• Fair and honest workplace
• Innovative thinking is encouraged
• Competitive salaries
• Continuous learning and development
• Health and wellness care options
• Financial solutions for the future
• Optional legal services (US only)
• Paid holidays
• Paid time off
This is a full time, exempt position, based out of our Santa Clara, CA or Arlingtion, TX locations. The target base pay for this position in Santa Clara, California is $170,000-200,000 annually. The total compensation package will be determined by various factors such as your relevant job-related knowledge, skills, and experience and location.
We are redefining how satellites are designed, manufactured and used—so we’re looking for candidates with passion, deep knowledge and direct experience on LEO satellite component development, design and in-orbit activities. If that’s your experience – then we’ll be immediately wow-ed.
E-Space is not currently able to provide employment sponsorship for candidates who do not hold work authorization for the location of this role.
$170,000 - $200,000 a year
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