Carrier-Grade Telecom Security Engineer - Equity

Zealot Labs, Inc.; Greater London; Hybrid; GBP 100,000 - 195,000; Full time

Benefits offered by this job

Equity

Job summary

Zealot Labs, Inc. is hiring in London for an Early-stage security-focused engineer who builds AI systems to find and exploit vulnerabilities in telecom infrastructure.

The role emphasizes reverse engineering firmware, carrier-grade routing, and developing AI-driven tooling to map attack paths across SS7, GTP, and DIAMETER stacks. You'll work on on-site London premises, collaborating with a small, ownership-driven team backed by top-tier investors.

Qualifications

• Extensive experience reverse engineering telecom equipment and firmware.
• Strong C/C++ and Python for tooling and exploit development.
• Solid background in carrier-grade networks (core, access, or routing).
• Experience with vendor OS platforms (Nokia, Ericsson, Huawei, ZTE).

Responsibilities

• Build AI systems to identify vulnerabilities in carrier-grade telecom infrastructure.
• Reverse engineer firmware and management planes across vendors.
• Target subscriber-edge infrastructure like BRAS/BNG/AAA/RADIUS stacks.
• Develop AI tooling to discover attack paths through SS7, GTP, DIAMETER.
• Translate telecom domain knowledge into scalable backbone-level data systems.
• Work with telco security teams to harden core networks.
• Contribute to building scalable AI agents and tooling.
• Move from manual research toward automated AI-driven security solutions.

Skills

C/C++

Python

Telecom security

Tools

Cisco IOS-XR

Juniper Junos

Nokia SR OS

Huawei VRP

Job description

Zealot Labs, Inc. is hiring in London for an Early-stage security-focused engineer who builds AI systems to find and exploit vulnerabilities in telecom infrastructure.

The role emphasizes reverse engineering firmware, carrier-grade routing, and developing AI-driven tooling to map attack paths across SS7, GTP, and DIAMETER stacks. You'll work on on-site London premises, collaborating with a small, ownership-driven team backed by top-tier investors.