SIM Management, 5G Core Engineer

E-Space

Arlington (TX)

On-site

USD 170,000 - 200,000

Full time

6 days ago

Be an early applicant

Application generator

An application made for this job — a tailored resume and cover letter that speak straight to the posting.

Get past ATS filters

Benefits offered by this job

Competitive salaries

Health and wellness care options

Paid holidays

Paid time off

Continuous learning and development

Job summary

E-Space is seeking a SIM Management5G Core Engineer to analyze, design, and verify configuration of subscriber data management across our 5G network. You will work on UDR/UDM deployments, capacity planning, and integration with AMF and other core elements.

You will lead provisioning workflows, perform troubleshooting, and build dashboards to monitor KPIs, ensuring high availability and SLA adherence in a fast-paced, space-enabled telecom environment.

Qualifications

Deep operational knowledge of HSS/HLR or UDR/UDM platforms.
Hands-on experience with configuration and troubleshooting.
Practical experience with 5G UDM/UDR, including cloud-native deployments (containerized/Kubernetes-based NFs) and HTTP/2 SBI interfaces (N8, Nudm_SubscriberDataManagement, Nudr_DataRepository).
Solid understanding of subscriber profiles: 5GS subscription.
Experience with IMSI/MSISDN range management and roaming configurations.

Responsibilities

Own the subscriber data management platform across 5G core domain.
Design and maintain subscriber provisioning workflows (IMSI/MSISDN, service profiles, roaming).
Implement and verify HTTP/2 interfaces connecting data nodes to AMF and core elements.
Build dashboards to monitor KPI and surface anomalies before outages.
Manage incidents for the subscriber data domain and ensure SLAs are met.
Perform maintenance, security audits, patching, and emergency response for UDM/UDR.

Skills

HSS/HLR/UDR/UDM platforms

5G Core networking

HTTP/2 SBI interfaces

Kubernetes (cloud-native NF)

Linux/Unix administration

Wireshark/tcpdump

NFV/telecom data provisioning

Education

Bachelor's or Master's in Telecommunications/CS

Tools

Kubernetes

Helm

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. Our team members have a 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: