Mobile Core Engineer, Carrier

Job not on LinkedIn

🔥 1 hour ago

🌐 Canada, United States – Remote

🇨🇦 Canada – Remote 🇺🇸 United States – Remote

💵 $158k - $248k / year

⏰ Full Time

🟡 Mid-level

🟠 Senior

👷🏻‍♀️ Engineer

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TextNow

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2009

📡 Telecommunications

👥 B2C

💰 $1M Seed on 2011-11

Telecommunications • B2C

TextNow is an app-first consumer wireless provider that offers free, ad-supported phone service with unlimited calling and texting over Wi‑Fi and optional paid 5G connectivity via SIM or eSIM. The service lets users choose a free local phone number instantly, provides free data access for select apps under a Free Flex plan, and offers paid data/day-pass or unlimited plans without long-term contracts. TextNow emphasizes no monthly fees for its basic offering, flexible add‑ons for full internet access, and nationwide 5G coverage when using its SIM/eSIM.

📋 Description

• Operate TextNow's converged 4G/5G mobile core, including packet core, IMS, HSS/UDM and related network functions • Define alarms, KPIs and thresholds and wire them into paging with SRE • Own configuration changes, including change plans, rollback criteria and impact analysis, through the SRE-run change pipeline • Validate vendor software in the lab before production release • Own capacity, subscriber/session/license headroom, SIM management and OTA updates • Lead partner and device onboarding for UEs, roaming partners and SIM profiles • Lead core incidents involving protocol, charging and policy issues • Lead voice interconnect and roaming signalling, including SBCs, SIP trunks, Diameter routing, IPX and signalling security • Maintain lawful intercept with the team and verify changes do not break it • Work with vendors on defects, providing evidence and pursuing root causes • Convert network knowledge into runbooks, health checks and AI-agent investigation steps • Lead core alarm correlation, configuration-change auditing and unusual call/data-session pattern detection • Bring SREs and developers up to speed on the core and share on-call responsibilities • Use AI to triage alarms, read logs and captures, review vendor documentation and draft change plans

🎯 Requirements

• 5+ years operating a live mobile core in production for an operator (carrier, MVNO or MVNE); vendor experience counts if you were on call for a customer's live network • Hands-on EPC/5GC packet core (PGW, SMF, UPF); working knowledge of IMS • Working knowledge of policy and charging (PCRF/PCF, OCS, quota enforcement) • Comfortable reading and dissecting a packet capture end to end • Written and run MOPs, upgrades and maintenance windows in production • Led production incidents • Comfortable deciding what "correct" looks like when nobody else knows • Looks for better ways to run the network rather than relying on established carrier practices • Already uses AI to triage, analyze logs and captures, and automate repetitive operations • Nice to have: alarm correlation or noise reduction on vendor network function alarms, or automated runbooks for core operations • Nice to have: cloud-native network functions on Kubernetes • Nice to have: DPI-based traffic classification • Nice to have: onboarding and troubleshooting devices (UE) • Nice to have: working with GSMA roaming specs (IR.21, IR.88) • Nice to have: Python or Go, git, kubectl

🏖️ Benefits

• Free phone service • Strong work life blend • Employee stock options • Unlimited vacation • 12 paid holidays per year • Competitive pay • Health, dental, and vision benefits • Short-term & long-term disability • $750 annual wellness benefit or healthcare spending account • RRSP matching (Canada) • Parental leave for eligible employees • Learning & Development opportunities • Team events and company-wide off-sites a few times a year

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