Our partner is looking for an FTTH Security Expert based in Spain.
We are looking for an experienced telecommunications security professional with strong hands-on knowledge of fixed-line networks and a particular interest in fiber-to-the-home (FTTH) technologies. In this fully remote, independent contractor role, you will assess the security of fiber access infrastructure, broadband equipment, provisioning systems, and operator environments. You will plan and conduct authorized security audits and penetration tests, uncover vulnerabilities, and develop practical recommendations to strengthen critical telecommunications infrastructure. You will collaborate with experienced security researchers and telecom specialists while contributing to internal tools, methodologies, and reusable testing resources. This is an opportunity to help protect the networks that underpin modern connectivity and digital sovereignty.
Security audits and penetration testing: Plan and conduct scoped, authorized penetration tests of FTTH and PON infrastructure, including Optical Line Terminals (OLTs), Optical Network Terminals (ONTs/ONUs), Optical Distribution Network (ODN) management systems, and customer premises equipment.
PON protocol and infrastructure analysis: CPE and gateway security: Analyze customer premises equipment through firmware extraction and reverse engineering, examining UART/JTAG debugging interfaces, hardcoded credentials, firmware update mechanisms, and web or command-line management vulnerabilities.
Subscriber management security: Network access and segmentation:



Investigate security considerations involving 5G Fixed Wireless Access (FWA), shared network cores, shared OSS/BSS platforms, unified identity systems, and billing infrastructure.
Network infrastructure assessment: Produce clear, prioritized security reports containing proof-of-concept evidence, risk assessments, and actionable remediation recommendations. Contribute to internal security tools, testing methodologies, laboratory environments, and reusable attack playbooks.
The idóneo candidate combines deep knowledge of fixed-line telecommunications architecture with proven cybersecurity auditing and penetration-testing experience. You should be comfortable investigating complex technical environments, identifying practical attack paths, and communicating security findings clearly.
Strong knowledge of fixed-line network architectures, particularly FTTx, DSL, and coaxial technologies.
Proven experience conducting security audits and penetration tests across both IT and OT infrastructure.
Practical understanding of FTTH and PON technologies, including their architecture, protocols, equipment, and provisioning processes.
Familiarity with telecommunications security standards and frameworks,



including 3GPP SCAS, GSMA NESAS, ISO/IEC 27001, NIST CSF, and ITU-T/BBF specifications.
Experience in red teaming or adversary emulation targeting critical infrastructure.
Strong technical capabilities in infrastructure security assessment, vulnerability analysis, and penetration testing.
Fluent English communication skills, both written and spoken.
French language skills are optional.
Offensive security certifications such as OSCP, OSEP, OSWE, or OSED.
Specialized telecommunications security training, including GSMA programs or telecom and hardware-focused training from Black Hat or DEF CON.
Published security research, CVE disclosures, conference presentations, or bug bounty experience involving telecommunications systems or embedded devices.
Fully remote working arrangement, with worldwide availability.
Independent contractor engagement, offering flexibility in how you organize your work.
Opportunity to work on advanced telecommunications and critical infrastructure security challenges.
Collaboration with experienced telecom specialists, security researchers, and industry professionals.
Exposure to emerging technologies, including FTTH, 5G, network virtualization, and telecom infrastructure security.
Opportunity to contribute to internal research, security tools, laboratory environments, and open-source initiatives.
Opportunity to contribute to a mission focused on protecting critical and sovereign telecommunications networks.
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📌 FTTH Security Expert (España)
🏢 Jobgether
📍 España