SIM Management, 5G Core Engineer

Socket.dev

Santa Clara (CA)

On-site

USD 180,000 - 260,000

Full time

5 days ago

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Benefits offered by this job

Competitive salaries

Paid holidays

Paid time off

Health and wellness care options

Job summary

E-Space in Santa Clara, CA is seeking a senior Core Network Engineer focused on subscriber data management for 5G. You will drive UDR/UDM operations, design provisioning workflows, and ensure seamless data flows across AMF and other core elements.

Ideal candidates have a strong background in HSS/HLR, 5G UDM/UDR, and cloud-native deployments using Kubernetes. On-site collaboration and rapid delivery are key in this role.

Qualifications

Bachelor's or Master’s degree in Telecommunications, Computer Science, or equivalent; post-graduate studies are a plus.
10+ years of core telecommunications network experience, with a minimum of 5 years hands-on with HLR, HSS, UDR, or UDM platforms.

Responsibilities

Own the subscriber data management platform across our 5G core networks.
Manage and operate UDR/UDM nodes ensuring high availability and data integrity.
Design and maintain provisioning workflows, including IMSI/MSISDN management and roaming configurations.
Implement and verify HTTP/2 SBI interfaces (N8, Nudm_SubscriberDataManagement, Nudr_DataRepository).
Use dashboards to monitor subscriber KPIs and surface issues before outages.
Lead incident management for the subscriber data domain and coordinate with vendors.
Perform maintenance, security audits, patching, and emergency response for UDM/UDR.

Skills

5G Core

UDR/UDM experience

HSS/HLR knowledge

Kubernetes/NF deployment

HTTP/2 interfaces

IMSI/MSISDN management

Education

Bachelor's or Master's degree in Telecommunications or Computer Science

Tools

Wireshark

tcpdump

Linux

Job description

Ready to make connectivity from space universally accessible,secureand actionable? Thenyou’vecome 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 ahighly-advancedlow Earth orbit (LEO) space system that will fundamentally change the design, economics,manufacturingand service delivery associated with traditional satellite and terrestrial IoT systems.

We’reintentional,we’reunapologeticallycuriousandwe’re100% committed toinnovatespace-based communications anddeliveractionable intelligence that will expand global economies, protect space and ourplanetand enhance our overall quality of life.

TheSIM Management5GCore Engineer will analyze, design, implement, and verify the configuration and integration of subscriber data managementnodes(UDR / UDM), networks, and systems across our5G infrastructure. Your scope of work includes introduction, upgrade, expansion, functionality, and capacity scenariosonmodern cloud-native UDM and UDR deployments. You will be a key contributor to the convergence of subscriber databases asplatformevolves — and your work will directly shape the reliability and scalability of the networks our partners depend on.

Key Responsibilities

As part of the5G Core team, you will own the subscriber data management platform across our network generations. Your responsibilities include:
Manage and operate UDR, and UDM nodes across 5G coredomain, ensuring high availability and data integrity for subscriber profiles.
Design andmaintainsubscriber provisioning workflows, including IMSI/MSISDN management, service profiles, and roaming configurations.
Implement and verify HTTP/2-based (N8,Nudm) interfaces connecting subscriber data nodes to AMFand other core elements.
Use and build dashboards tomonitorsubscriber node KPIs, quickly surface abnormal conditions, andidentifypatterns before they become outages.
Own incident management for the subscriber data domain: follow communications procedures for internal escalation and external vendor coordination, ensuring SLAs are met.
Perform maintenance, security audits, patching, and emergencyresponsefor UDM/UDR platforms.
Undertake fault handling and corrective actions at node, service, and infrastructure level, including protocol trace analysis (Wireshark/tcpdump) onHTTP/2 signaling.
Lead and contribute to project activities: E2E introduction of new subscriber management nodes, capacity expansions, software upgrades, and feature activations.
Support onboarding by configuring subscriber data repositories, IMSI ranges, and roaming agreements in UDM/UDR systems.
Collaborate with teams to resolve cross-domain subscriber authentication and registration issues.

Key Qualifications

At least 10 years of experience in core network engineering with a focus on subscriber data management in5G Corenetworks.

Technical — Subscriber Data Management

Deep operational knowledge ofHSS/HLRor UDR/UDMplatforms.
Hands-on experience with configuration and troubleshooting.
Practical experience with 5G UDM and UDR, including cloud-native deployments (containerized/Kubernetes-based NFs) and HTTP/2 SBI interfaces (N8,Nudm_SubscriberDataManagement,Nudr_DataRepository).
Solid understanding of subscriber profile structures: 5GS subscription.
Experience with IMSI/MSISDN range management, number portability (NP/MNP) integration, and SIM/eSIMprovisioning workflows.

Technical — Network & Systems

Working knowledge of5G SA (AMF/SMF/UDM/UDR/AUSF/UDSF) core architectures and their subscriber data flows.
Familiarity with 3GPP standards governing subscriber data: TS 29.503/29.504 (UDM/UDR SBI), TS 23.502 (5G procedures).
Comfortable with Linux/Unix-based systems — able to navigate shells, interpret logs, manage processes, and perform basic system administration on telecom NF hosts.
Hands-on with Wireshark,tcpdump, and vendor-specific trace tools for deep analysis of MAP, Diameter, and HTTP/2 subscriber signaling.
Experience with high-availability configurations for subscriber databases: active/standby, geo-redundancy, and database replication/synchronization.
Familiarity with cloud-native telecom platforms (Kubernetes) and Helm-based NF lifecycle management.

Education & Background

Bachelor's orMaster'sdegree in Telecommunications, Computer Science, or equivalent; post-graduate studies are a plus.
10+ years of core telecommunications network experience, with a minimum of 5 years hands-on with HLR, HSS, UDR, or UDM platforms.

Bonus Points for the Following

Experience with 3GPP NTN core adaptations (Rel-17/18): satellite access node (SAN) architecture,timerand window parameter adaptation for high-latency links, or UPF placement in non-terrestrial topologies.
Background in MVNO core architecture: roaming interfaces (N32/SEPP, Diameter S6a/S9), multi-PLMN federation, MVNO interconnect, oreSIM/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.

Additional Requirements

This is a fast-paced, high-impact environment - flexibility to occasionally work extended hours or weekends during critical periods is expected.

This is a full time, exempt position, based out of our Santa Clara, CA office.

The total compensation packaged will bedeterminedbyvarious factorssuch as your relevant job-related knowledge, skills, and experience.

We are redefining how satellites are designed,manufacturedand used—sowe’relooking for candidates with passion, deep knowledge and direct experience on LEO satellitecomponentdevelopment,designand in-orbit activities. Ifthat’syour experience – thenwe’llbeimmediatelywow-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.The Company is not currently able to provide employment sponsorship for candidates who do not hold work authorization for the location of this role.

Why E-Space is right for you

As a member of our team, you will play a crucial role in driving our success.We resources must not include newline characters, so we keep the paragraph as a single line. Let's combine the paragraph: As a member of our team, you will play a crucial role in driving our success.Our team members havea strong senseof dedication and responsibility; this includes a strong commitment to our mission to create an entirely new suite of global capabilities to improve lives, businessefficienciesand 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’swhy we support and invest in the physical,emotionaland financial well-being of our team members and their families. Some of what you can expect when working at E-Space: