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Principal Security Engineer

External
talkdesk2 logoTalkdesk2 · Portugal
Full-timeOn-site3w ago
Application SecurityAWSAzureCloud SecurityGCPIAM
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Responsibilities

  • Advanced AppSec & Offensive Security
  • Deep-Dive Pentesting: Conduct sophisticated manual penetration tests across web applications, APIs, and microservices architecture.
  • Exploit Development: Go beyond automated scanners to identify logic flaws and develop Proof-of-Concept (PoC) exploits to demonstrate business risk.
  • Secure Code Review: Build and contribute to agents that perform line-by-line analysis of critical code paths in Go, Python, Java or others to identify vulnerabilities so they get remediated before they reach production.
  • Remediation Engineering: Partner directly with engineering teams and their agents to write and push code fixes, ensuring vulnerabilities are closed, not just reported.
  • AI Development, Security & Audit
  • LLM Security: Design and implement defenses against Prompt Injection, Data Poisoning, and Model Inversion attacks.
  • AI Red Teaming: Adversarially test our internal AI agents and customer-facing LLM features.
  • Audit & Governance: Establish technical audit frameworks for AI model training data, bias detection, and output safety.
  • Tooling: Build custom agents to automate the security testing of web apps, APIs, AI pipelines and vector databases, among others.
  • Cloud Security & Infrastructure as Code
  • Hardening: Secure AWS/GCP/Azure environments with a focus on IAM least privilege and container security (Kubernetes).
  • Automated Guardrails: Develop agents and OPA (Open Policy Agent) policies / Terraform Sentinels to prevent insecure infrastructure deployments.
  • Cross-Functional Tooling: Build and maintain a unified security "mesh" that integrates AppSec signals with Cloud logging (SIEM/SOAR).
  • Technical Leadership
  • Act as the "Security Architect of Record" for high-impact cross-functional projects.
  • Mentor senior engineers and foster a culture of "Security by Design" across the organization.

Requirements

  • Contributions to open-source security tools or AI security research.
  • Relevant certifications: OSCP/OSWE, AWS Certified Security, or specialized AI/ML credentials.
  • Experience building custom Security Orchestration, Automation, and Response (SOAR) workflows.
  • Work Environment and Physical Requirements:
  • Primarily office-environment work, extended periods of sitting or standing, computer-based work. Limited lifting, and equipment usage limited to computer-related equipment (keyboards, mouse, etc.)

Benefits

Paid time off

Additional Information

We are seeking a battle-hardened Principal Security Engineer to lead our technical offensive and defensive strategies. This is not a policy-writing role; it is an extremely hands-on position designed for an engineer who thrives on breaking complex systems, building custom security tooling, and securing the next generation of AI-driven applications. You will be the technical authority for Application Security, Penetration Testing, and Cloud infrastructure, with a specialized focus on the security lifecycle of Large Language Models (LLMs) and AI integrations.


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