Security Engineer

About the role

Poseidon is an AI data infrastructure company focused on sourcing and delivering high-quality real-world data for AI training. It works closely with PIP Labs, an R&D company contributing to the development of the DATA Network, open infrastructure for sourcing, processing and verifying human-generated data. We are looking for a hands-on Security Engineer to support both Poseidon and PIP Labs, owning security across their cloud environments, endpoints, internal systems and data infrastructure. This is a practical ownership role for someone who communicates clearly, moves quickly and is comfortable supporting growing, globally distributed teams.

Responsibilities

• Own day-to-day security operations across Poseidon and PIP Labs, including monitoring, alert triage, incident response and remediation.
• Secure and administer our AWS environments, with some exposure to Google Cloud, and continuously improve our cloud security posture.
• Manage endpoint security and device controls using tools such as CrowdStrike and Jamf.
• Automate recurring security and IT workflows so controls can scale across both organizations without unnecessary manual work.
• Partner with infrastructure and engineering teams to identify risks, improve configurations and ship practical fixes, including contributing code or pull requests where appropriate.
• Own dependency hygiene and software supply chain security, ensuring third-party code is appropriately vetted, pinned and continuously monitored for compromise.
• Support identity, access, device and other internal IT security needs for globally distributed teams.
• Develop and maintain clear security procedures, playbooks and documentation.
• Help strengthen how sensitive and valuable real-world datasets are ingested, stored, accessed and protected across Poseidon, PIP Labs and the broader DATA Network ecosystem.
• Contribute to security readiness in a high-threat environment, including protection against targeted account compromise, credential theft and sophisticated social-engineering attempts.

Requirements

• Professional experience in cloud security, IT security, security engineering or a closely related role.
• Strong practical knowledge of AWS security, including identity and access management, logging, monitoring and secure configuration.
• Experience operating endpoint detection and response and device-management tooling. Experience with CrowdStrike and Jamf is strongly preferred.
• A track record of automating operational workflows through scripting, APIs, infrastructure tooling, agents or security orchestration.
• Comfort handling both security engineering and hands-on internal IT responsibilities.
• A proactive, low-ego approach. You identify gaps, propose solutions and follow work through to completion.
• Excellent written and spoken English, with the ability to communicate clearly across technical and non-technical teams.
• Sound judgment under pressure and a practical approach to balancing security, speed and usability.

Qualifications

• Experience securing data platforms, ingestion pipelines or environments that hold high-value datasets.
• Familiarity with Google Cloud or Google Workspace administration and security.
• Experience working in Web3, blockchain or another environment exposed to persistent, sophisticated threat actors.
• Experience supporting multiple companies, business units or portfolio organizations through a shared security function.