Security Engineer Lead

Security Engineer Lead

Introduction

We are recruiting on behalf of our valued client for a position with their organization. This opportunity is for a Senior Security Lead role designed to lead the strategy and hands-on implementation of systems that protect the integrity of Arena Intelligence, a multi-million user AI platform.

The Role

You’ll work across product, infrastructure, and data pipelines to proactively identify risks, embed security into core features, and build scalable defenses against abuse, fraud, and adversarial behavior. This is a builder role - you’ll not only set technical direction but also write the code, build the tools, and design the frameworks that make security and trust part of this product’s DNA.

Responsibilities

• Own the product security vision, ensuring security and trust are core to every stage of the product lifecycle.
• Design and implement platform-wide security features, including Sybil resistance, bot detection, reputation systems, and anti-abuse primitives.
• Lead threat modeling and security architecture reviews for new and existing product features.
• Collaborate with infrastructure and product engineering to design secure APIs, data flows, and identity systems that scale.
• Improve developer velocity by creating secure-by-default frameworks and tooling for internal teams.
• Partner with incident response to quickly assess, contain, and remediate security events, and lead deep postmortems to improve defenses.
• Stay ahead of the curve by monitoring emerging attack techniques and applying cutting-edge security research to our platform.
• Mentor engineers across the company on secure coding practices, architecture trade-offs, and operational security.

Qualifications

• 8+ years of experience in software engineering or security engineering, including staff-level scope in securing large-scale, user-facing platforms.
• Proven track record designing and implementing systems to detect, mitigate, and prevent adversarial behavior (bots, Sybil attacks, automated abuse).
• Strong experience with threat modeling, secure architecture design, and risk assessment.
• Hands-on experience building security features into production systems at scale (millions of DAU / billions of requests).
• Proficiency in backend development (Node.js, TypeScript, Python, or Go) and willingness to work across the stack.