Security Engineer: Build Scalable Defenses, Threat Modeling

Meta; City Of London; On-site; GBP 90,000 - 120,000; Full time

Job summary

Meta's Security Engineering team is seeking a Security Engineer to help protect billions of users and Meta's global infrastructure. You will conduct security assessments, vulnerability research, and threat modeling across Meta's products and systems—spanning mobile applications, web platforms, backend services, and internal infrastructure.

You will identify systemic security gaps, drive mitigations at scale, and partner with engineering teams to embed security best practices into the software

Qualifications

• 6+ years of experience in security engineering or equivalent
• Experience performing threat modeling and security architecture reviews for large-scale systems
• Experience identifying systemic security risks and driving cross-functional remediation
• Experience developing or improving security tooling, automation, or detection capabilities
• Experience communicating security findings and risk assessments in writing to technical and non-technical stakeholders

Responsibilities

• Conduct security assessments across web, mobile, and backend systems to identify risks
• Perform threat modeling and architecture reviews for products and infrastructure
• Identify gaps and drive scalable mitigations beyond individual findings
• Develop tooling to enhance detection and response capabilities
• Collaborate with engineering teams to embed security into the SDLC
• Lead complex investigations and coordinate incident response efforts
• Translate findings into actionable recommendations for engineering leadership
• Mentor engineers on security best practices and support recruiting/onboarding

Skills

Penetration testing

Vulnerability research

Threat modeling

Security tooling

Automation

AI tools

Python

C/C++

Java

Documentation

Tools

Static analysis

Dynamic analysis

Internal security platforms

AI tooling

Job description

Meta's Security Engineering team is seeking a Security Engineer to help protect billions of users and Meta's global infrastructure. You will conduct security assessments, vulnerability research, and threat modeling across Meta's products and systems—spanning mobile applications, web platforms, backend services, and internal infrastructure.

You will identify systemic security gaps, drive mitigations at scale, and partner with engineering teams to embed security best practices into the software