Remote Mobile Core Engineer: Troubleshooting & Ops

Telnyx; Dublin; Remote; EUR 65,000 - 100,000; Full time

Job summary

Telnyx in Ireland (remote) is seeking a hands-on Telecom Operations professional to maintain and debug core mobile signaling, core EPC infrastructure, and roaming interconnects. You will work on end-to-end subscriber issues, analyze pcap traces, and coordinate with roaming partners and vendors to keep the mobile core healthy.

The role combines protocol-level investigations with practical platform operations, involving Linux, Ansible and Kubernetes, with opportunities to influence tooling and

Qualifications

• 3+ years operating or engineering telecom infrastructure — EPC, HSS/HLR, DRA, STP, PGW, SMF, or equivalent.
• Strong understanding of mobile core signalling: Diameter (S6a, S6d, Gx), SS7/MAP/TCAP, GTPv2-C, GTP-U.
• Comfort reading pcap traces — tshark/Wireshark protocol dissection, filtering by IMSI/AVP/transaction, protocol hierarchy analysis.
• Solid Linux systems skills and comfort operating infrastructure via configuration/automation tooling (Ansible or equivalent).
• Comfort working in a vendor-managed environment — driving external partners and roaming NOCs to resolution without direct control.
• Ability to read code and scripts well enough to follow a signalling path through a system.
• Working knowledge of a scripting or programming language (Python, Elixir, Go, or similar) for tooling and diagnostics.
• Experience with freeDiameter and custom AVP transforms.
• Kubernetes and containerised EPC workloads.
• Roaming agreement experience — NRTRDE, TAP, sponsored roaming models, ORS blacklists.
• Multi-IMSI SIM applet knowledge and OTA provisioning.
• Experience with etcd-based configuration distribution.
• 3GPP standards familiarity (TS 29.272, 29.060, 29.244, 29.002) — enough to read specs when chasing a protocol-level issue.

Responsibilities

• Subscriber & connectivity troubleshooting: Investigate end-to-end attachment failures across S6a, MAP, GTP-C/U.
• Decode pcap traces to isolate signalling failures and trace IMSIs across networks.
• Diagnose DNN/APN routing mismatches and private gateway config issues.
• Handle customer-reported SIM connectivity issues end-to-end from report to fix.
• EPC platform operations: Manage HSS/HLR, STPs, PGWs, SMFs, GTP proxies; work with etcd-based steering infrastructure.
• Operate GTP proxy routing database and participate in vendor management for resolution.
• Roaming & interconnect: Support roaming relationships, investigate NRTRDE gaps, coordinate with NOCs.
• On-call & incident response: weekly rotation, drive end-to-end incident resolution, write post-incident summaries.
• Automation & tooling: Extend pcap analysis tooling, add config/automation for EPC infra, improve dashboards and metrics.
• Small code changes for fixes where needed; this is operations-focused, not software development.

Skills

Telecom infrastructure ops

EPC/HSS/HLR expertise

pcap analysis (Wireshark/Tshark)

Linux systems

Ansible automation

Kubernetes

Go/Python scripting

Vendor & roaming partner coordination

3GPP protocol familiarity

Etcd configuration distribution

Tools

Etcd-based infrastructure

GTP proxy routing database

DRA with Python transforms

Job description

Telnyx in Ireland (remote) is seeking a hands-on Telecom Operations professional to maintain and debug core mobile signaling, core EPC infrastructure, and roaming interconnects. You will work on end-to-end subscriber issues, analyze pcap traces, and coordinate with roaming partners and vendors to keep the mobile core healthy.

The role combines protocol-level investigations with practical platform operations, involving Linux, Ansible and Kubernetes, with opportunities to influence tooling and