Core Network Security Engineer (Signaling & Roaming)

Role Purpose

Design and implement signaling‑security controls (SS7/Diameter/SIP) to reduce roaming exposure, fraud risk, and attacks, delivering evidence and operational handover to SOC/NOC.

Key Responsibilitie

s• Define signaling‑security architecture and baseline policy/rule sets (permit/deny, anomalies, rate limits)

.• Analyze roaming vulnerabilities and risks; design mitigations and validate effectiveness

.• Coordinate security tests (abuse cases, simulations) and fine‑tune rules to minimize false positives

.• Integrate events/telemetry with monitoring/SIEM platforms and define actionable alerts

.• Develop MOPs with rollback and operational runbooks for the security team

.• Support cutovers and post‑implementation validations (hardening, route verification)

.
Requirements (Must‑Hav

e)• Strong practical experience in SS7, Diameter, and/or SIP in telecom environment

s.• Experience in roaming/fraud security and operation of signaling‑security control

s.• Ability to integrate with SOC/SIEM and produce evidence/documentation for acceptanc

e.
Nice‑to‑H

ave• Experience with STP/DRA/SBC and multi‑vendor signaling routi

ng.• Cybersecurity certifications or formal telco‑security backgrou

nd.
Deliverables / Success Crit

eria• Security design, baseline ruleset, test‑case mat

rix.• Evidence of mitigation/validation, operational procedures, handover to Security/

NOC.• Acceptance checklist and post‑go‑live monitoring/alerting p