Member of Technical Staff (Software Engineer, Security)

Perplexity; Greater London; On-site; GBP 164,000 - 302,000; Full time

Job summary

Perplexity is seeking a hands-on Software Engineer to build and evolve security tools and AI‑driven agents that improve detection, response, vulnerability management, and the security posture of our products and infrastructure.

You will design, implement, and operate production services, CLIs, and integrations with logging pipelines, SIEMs, EDRs, and cloud APIs, collaborating with cross‑functional teams to ship secure, high‑impact improvements.

Qualifications

• 4+ years building security tools or engineering security roles.
• Proficiency in Python/Go/TypeScript and production services.
• Experience with logging pipelines, SIEMs, EDR, or cloud APIs.
• Threat modeling or secure design experience.
• Bug bounty or vulnerability management participation is a plus.
• Familiarity with AWS and modern SaaS environments.
• Ability to work with cross-functional teams and own end-to-end projects.
• Bonus: AI-powered security agents or automation design.

Responsibilities

• Design, build, and maintain software and automation for detection and response.
• Develop AI agents and security bots for monitoring, investigations, reporting.
• Support bug bounty and vulnerability disclosure workflows.
• Threat model new features and add mitigations.
• Contribute to secure-by-default libraries and services.
• Integrate security signals from cloud, endpoints, SaaS into pipelines.
• Build automation to reduce manual incident response work.
• Review designs and code with security and software engineers.

Skills

Security tooling

Python

Go

TypeScript

CI/CD

Cloud (AWS)

Threat modeling

Incident response automation

Production services

Job description

About The Role

Perplexity is seeking a hands‑on Software Engineer to build and evolve the software, automations, and systems that power our security operations. This role focuses on engineering security tools and internal AI‑driven agents that improve detection and response, vulnerability management, and the overall security posture of our products and infrastructure.

Responsibilities

• Design, build, and maintain software and automation that improves our detection and response program, including alert enrichment, triage workflows, and investigation tooling.
• Implement and enhance internal AI agents and security bots that assist with monitoring, investigations, reporting, and other security operation tasks.
• Develop and operate systems and workflows that support the bug bounty and vulnerability disclosure program, including intake, triage, prioritization, and remediation tracking.
• Partner with product and engineering teams to threat model new features and systems, propose mitigations, and add guardrails into designs and implementations.
• Contribute to secure‑by‑default libraries, services, and patterns that make it easy for teams to build secure features.
• Integrate security signals from cloud, endpoints, SaaS, and applications into cohesive pipelines and data models that support detection and analysis.
• Build automation to reduce manual work in incident response, containment, and remediation.
• Collaborate with security engineers and other software engineers to review designs and code, and to continuously improve our security tooling and platforms.

Qualifications

• 4+ years of experience as a software engineer with significant time spent building security‑related tools, platforms, or automations, or in a security engineering role with strong software development responsibilities.
• Proficiency in at least one major programming language (such as Python, Go, or TypeScript) and experience building production services, CLIs, or internal tools.
• Experience integrating with security‑relevant systems such as logging pipelines, SIEMs, EDR, cloud APIs, or identity platforms.
• Practical experience with threat modeling, secure design, or application security reviews for services or features.
• Experience operating or contributing to bug bounty or vulnerability management programs is a plus.
• Familiarity with cloud infrastructure (AWS preferred) and modern SaaS environments.
• Ability to work closely with cross‑functional teams, own projects end‑to‑end, and ship pragmatic, high‑impact improvements.
• Bonus: Experience designing or improving AI‑powered agents or automation used for security operations.

Compensation Range: $220K - $405K