Platform Security Engineer

🕒 March 6

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Complexio

11 - 50 employees

🤖 Artificial Intelligence

☁️ SaaS

🏢 Enterprise

Artificial Intelligence • SaaS • Enterprise

Complexio is a company specializing in foundational artificial intelligence solutions designed for task automation using whole company data. Headquartered in London, they also have offices in Copenhagen and Monaco. Complexio is focused on leveraging AI technologies to enhance efficiency and automate processes within organizations. They prioritize data privacy and consent management, ensuring compliance with international data protection standards.

📋 Description

• Designing and implementing authentication and authorization for a large, graph-based database (hundreds of thousands of nodes) • Building and evolving secure OAuth-based AuthN/AuthZ flows, including token handling, permission models, and enforcement • Making concrete improvements to production security posture • Auditing, understanding, and improving data flows and data-privacy controls, ensuring sensitive data does not end up where it shouldn’t • Acting as a security and privacy gatekeeper in reviews — asking hard questions and requiring changes when needed • Improving and maintaining supply-chain security, including SAST, SCA, container scanning, and CI/CD hardening

🎯 Requirements

• Strong proficiency in Python (our primary language) • Deep understanding of authentication and authorization concepts, including OAuth, JWTs, permission models, and secure token handling • Experience designing and securing non-trivial data systems • Ability to reason about risk, trade-offs, and real-world constraints • A track record of shipping real security improvements, not just writing policy • Experience with graph databases, ideally Neo4j or similar • Experience with CI/CD and supply-chain security (SAST, SCA, container scanning, pipeline hardening) • Experience with Go or Rust • Some familiarity with frontend or React (not required, but useful for end-to-end thinking)

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