The Role
We’re looking for a Mobile Core Network Engineer to join the team responsible for Telnyx’s global mobile core network. You’ll own the infrastructure that powers our wireless platform — keeping it reliable, scalable, and ready for what comes next. This is a hands‑on role spanning network operations, deployment automation, and incident response.
What You’ll Do
Network Operations & Infrastructure
Deliver and maintain core network services across global datacenters — ensuring high availability of PGWs, DRAs, GTP proxies, HSS, and STPs.
Design redundancy patterns (failover, active-active, disaster recovery) and drive service localisation in new regions.
Manage the GTP proxy fleet and DRA infrastructure: routing rules, IMSI translation, realm routing, and peer management.
Monitor traffic growth, forecast demand, and scale infrastructure ahead of need.
Automation & Deployment
Build and maintain Ansible playbooks and CI/CD pipelines for consistent, repeatable infrastructure changes.
Operate and evolve the signalling plane — Diameter, GTP‑C/U, SS7 MAP — across roaming partner interconnects.
Design and maintain network connectivity: GRX/IPX peering, inter‑datacenter tunnels, SCTP multihoming, and firewall rules.
Observability & On‑Call
Build dashboards and alerting to catch issues before they become incidents.
Participate in on‑call rotation for wireless infrastructure incidents.
What We’re Looking For
Solid understanding of 3GPP EPC architecture: PGW, SGW, HSS, DRA, PCRF, STP, and their interfaces (S6a, S8, S5, Gx, S1‑MME).
Experience operating and troubleshooting mobile core network elements in production.
Strong networking fundamentals: IP routing, BGP/OSPF, VLANs, GRE/IPsec, SCTP, and packet‑level troubleshooting (tcpdump/tshark).
Strong Linux skills: systemd, network configuration, performance tuning, and scripting.
Hands‑on experience with infrastructure automation — Ansible, Terraform, or equivalent.
Familiarity with containerised environments (Docker, Kubernetes) and CI/CD pipelines.
Experience with monitoring stacks: Prometheus, Grafana, Alertmanager.
Experience with AWS or similar cloud infrastructure.
Nice to Have
Experience with Diameter Routing Agents (freeDiameter or commercial DRAs) or GTP proxy platforms.
Knowledge of multi‑IMSI SIM architectures, VoLTE/IMS, or roaming models (S8HR, LBO).
Familiarity with IPX/GRX peering, GSMA roaming standards (IR.34), or network automation tooling (Netbox, NAPALM).
Experience with Elixir, Go, or Python in a network infrastructure context.
#J-18808-Ljbffr