Senior Security Lead

This is 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. You will 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 will not only set technical direction but also write the code, build the,

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,