Zealot is deploying AI systems at the center of western cyber operations , backed by tier-1 US VCs and industry leaders. Our team includes alumni of Anthropic, xAI, and Anduril. Soon live with close U.S. allies abroad. APPLIED AI RE VR ERICSSON HUAWEI NOKIA ZTE Compensation 100K-195K + skin in the game equity Location London, United Kingdom On Site Stage Early-stage startup backed by tier 1 investors. Small, growing team with exceptionally high ownership. + Build AI systems that find and exploit vulnerabilities in carrier-grade telecom and ISP infrastructure: core routers, BRAS/BNG, GPON/EPON, DSLAM, CMTS, and mobile packet core. + Reverse engineer firmware and management planes on equipment from Nokia, Ericsson, Huawei, ZTE, Calix, and similar vendors to train models that generalize across platforms. + Target subscriber-edge infrastructure (BRAS, BNG, AAA systems, and RADIUS/DIAMETER stacks) where authentication, session control, and policy enforcement converge. + Develop AI-driven tooling that discovers attack paths through SS7, GTP, DIAMETER, and carrier routing infrastructure at scale. + Turn deep telecom domain knowledge into the systems and data that let machines operate at the backbone level. + Strong experience with telecom or ISP infrastructure security: core networks, access networks, or carrier routing. + Familiarity with carrier-grade platforms: Cisco IOS-XR, Juniper Junos, Nokia SR OS, Huawei VRP, or similar. + Understanding of telecom protocols: SS7/SIGTRAN, GTP, DIAMETER, RADIUS, MPLS, BGP at carrier scale, GPON/EPON. + Experience reverse engineering network equipment firmware or proprietary network operating systems. + Strong C/C++ or Python skills for tooling and exploit development. Nice to Have + Experience with mobile core network elements (MME, SGW, PGW, HSS, or 5G equivalents). + Familiarity with BRAS/BNG, DSLAM, CMTS, OLT, or other access and subscriber-edge network equipment. + Published CVEs or advisories against telecom or ISP equipment vendors. + Experience with TR-069/CWMP, NETCONF/YANG, RADIUS/DIAMETER AAA, or carrier management protocols. + Experience building with LLMs and AI agents. + Background in CNO, SIGINT, or government telecom operations. + Clearly interested in stepping away from purely manual research and moving toward the development of AI systems. + Building something massive matters more to you than comfort, titles, or predictability. + You want to be early at a company that will change an industry, and you're ready to do what that actually takes. Note to recruiting firms: Telecom or ISP infrastructure security experience is the core requirement. Carrier-grade routing, mobile core, or access network experience is essential. Candidates from telco vendor security teams, CNO backgrounds, or ISP engineering are ideal. Ready?
Telecom / ISP Security Engineer APPLIED AI RE VR ERICSSON HUAWEI NOKIA ZTE NewYork, NY / On Site → employer: Zealot Labs, Inc.
Zealot is an exceptional employer for Solutions Engineers, offering a dynamic and innovative work environment where you can directly impact the deployment of cutting-edge AI-driven cyber systems. With a competitive compensation package and equity options, employees enjoy a culture of high ownership within a small, growing team that values collaboration and personal growth. The hybrid work model allows for flexibility while providing opportunities to engage with customers across the UK and Europe, making it a rewarding place for those looking to advance their careers in a meaningful way.
