[Hiring] Telecommunications Security Specialist @P1 Security

Role Description

If your years have been spent in FTTx — access networks, PON, CPE, provisioning, field operations — and security has always been the question you kept coming back to, talk to us. The role described below does not really exist as a box to tick yet: we care far more about the person than about an exact match with a job title. Bring the part of the picture you know best, and we will build the rest together.

What you will do

• Audits: Plan and run scoped, authorized penetration tests of FTTH/PON infrastructure: OLTs, ONTs/ONUs, the management systems around the ODN, and customer premises equipment.
• PON internals: Dig into GPON, XG-PON, XGS-PON and NG-PON2: OMCI, PLOAM, and how ONTs are authenticated and provisioned.
• CPE and gateways: Take them apart: firmware extraction and reverse engineering, exposed debug interfaces (UART/JTAG), hardcoded credentials, update mechanisms and web/CLI management flaws.
• Subscribers at scale: Look at what provisions and manages them (TR-069/CWMP, TR-369/USP, ACS/OSS/BSS integrations, zero-touch provisioning) and at the subscriber-facing edge: BNG/BRAS, PPPoE/IPoE, DHCP, RADIUS/AAA, VLAN segmentation, QoS and isolation between subscribers.
• Convergence and infrastructure: Follow fixed–mobile convergence (5G FWA, shared core, shared OSS/BSS, unified identity and billing) and review devices and management planes (routers, switches, aggregation equipment, NMS/EMS, SNMP, NETCONF/YANG, SSH/Telnet, APIs, privileged access) against vendor and industry hardening baselines.
• Threat modeling: Map attack paths for real operator environments using frameworks such as MITRE ATT&CK, the GSMA FASG/FS.xx guidance and the MITRE FiGHT knowledge base.
• Findings and clients: Turn all of this into clear, prioritized reports with proof-of-concept evidence, risk ratings and actionable remediation, present them to stakeholders, and support remediation verification and retesting.
• The team: Contribute to our internal tooling, test methodologies, lab environments and reusable attack playbooks.

Qualifications

• Deep knowledge on Fixed-line network architecture (FTTx, DSL, Coaxial)
• MANDATORY: Experience in security audit pentests on OT and IT infrastructure
• Experience with vendor ecosystems such as Huawei, ZTE, Nokia, Ericsson, Calix, or Adtran FTTH equipment.
• Familiarity with telecom security standards and frameworks: 3GPP SCAS, GSMA NESAS, ISO/IEC 27001, NIST CSF, and ITU-T/BBF specifications.
• Experience in red teaming or adversary emulation against critical infrastructure.
• Relevant certifications, such as:
  • OSCP / OSEP / OSWE / OSED
  • GPEN / GXPN / GRID
  • CEH (Practical), eJPT/eCPPT, or CRTO
  • Telecom-specific training (GSMA, Black Hat/DEF CON telecom or hardware trainings)
  • Published research, CVEs, conference talks, or bug bounty history in telecom or embedded devices.

Language Requirements

• English - fluent speaker
• French - optional

Further Details

• Headquarters: Fully remote company, with headquarters in Paris - FRANCE
• Remote policy: At P1 Security, we recognize the importance of work-life balance, and that's why our remote policy is a key part of our company culture. We understand that flexibility is crucial, allowing our team members to work remotely while achieving their personal and professional goals. To keep our team connected, we schedule monthly meetups with department members and gather the entire team on-site every two months. These regular touch points ensure effective communication, collaboration, and a dynamic team spirit, reflecting the dynamic and adaptable spirit of P1 Security. We believe in the power of flexible work arrangements to bring out the best in our team, driving success in a way that suits everyone's unique lifestyle.

Hiring Process

• First contact call (10-20min)
• Direct manager call (30min)
• Capability assessment exercise (depending on position)
• C-level & Director call (30 min)

Specialisations

• Telecommunications Security
• SS7, SIGTRAN, LTE, IMS, UMTS, CDMA, GPRS
• OpenStack, Kubernetes, Linux Servers / PNF
• Diameter, NFV, Security
• VoLTE, VoWifi, GTP, Diameter
• 3G, 4G, IoT Security
• NFV(i), S1AP, X2AP, Fuzzing
• eUTRAN S1AP, X2AP, NgRAN, NGAP, PFCP, 5GC SBI

Contact

If you are a motivated and experienced professional who is passionate about cybersecurity and driving innovation, we would love to hear from you! Join P1 Security and be part of a fascinating mission to protect critical infrastructure and work alongside industry experts in the cybersecurity field.