Principal AppSec Engineer

• Medical / Health Insurance
• Open Annual Leave
• Employee Assistance Programme
• Training & Learning Development

• 6+ years' experience in offensive security - pentesting, red teaming, or adversary emulation - ideally including production/live-environment experience.
• Strong architecture review skills, with the ability to threat-model a system from a design document rather than only testing a finished build.
• Familiarity with the modern AppSec tooling landscape (SAST/DAST, AI-assisted pentest tools).
• Comfortable acting as the technical escalation point for the team's hardest problems.

• Experience running or contributing to bug bounty triage or vulnerability-disclosure programmes.

We are on a mission to pioneer the world's next era of play. As we grow across Europe and Latin America, we're building The Playstack - the technology powering the next generation of sports, gaming, and fan experiences. Join us, and help make it the most widely used platform in the world! From operations, to marketing, to product, we are looking for talented people who will shape how millions of customers play, watch, and connect every day.

Product Security is responsible for preventing vulnerabilities before code ships, absorbing on-demand security-testing load, and making security testing part of everything that reaches production. This role owns the team's deep offensive capability, running adversary emulation and bypass testing against production systems and providing the technical depth behind the team's hardest architecture reviews. Reporting to the Product Security Lead, the Principal AppSec Engineer sets the bar for pentest quality that engineers execute against.

• Run adversary emulation and bypass testing against production systems to identify exploitable weaknesses.
• Own the standardised pentest playbooks used for urgent "launching next week" requests and personally handle the highest-complexity engagements.
• Lead in-depth architecture and design reviews for high-risk features, threat-modelling before code is written and producing security requirements and sign-off.
• Mature and scale AI-assisted pentest tooling (e.g. NEO, regression code scanning) to increase testing coverage.
• Mentor less experienced AppSec engineers in pentest methodology and adversarial thinking.
• Feed confirmed bypass and pentest findings to Detection Engineering & Threat Hunting so each becomes a shipped detection.
• Contribute to the vendor security testing element of the shared vendor intake process for high-risk vendors.