Lead Security Engineer — Hands-On Platform Security

People Culture Talent; San Francisco (CA); On-site; USD 200,000 - 400,000; Full time

Benefits offered by this job

Visa sponsorship available

Job summary

Arena Intelligence is seeking a Senior Security Lead to design and lead the strategy and hands-on implementation of systems that protect the integrity of a multi‑million user AI platform. You will work across product, infrastructure, and data pipelines to proactively identify risks and embed security into core features.

You will write code, build tools, and design frameworks that make security an integral part of the product’s DNA, mentoring engineers and advancing secure-by-default practices

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 when needed.
• Strong knowledge of distributed systems security, identity, and authentication mechanisms.
• Excellent communication skills, able to build alignment across engineering, product, and leadership teams.

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.

Skills

Security engineering

Threat modeling

Backend development

Distributed systems security

Communication

Tools

Node.js

TypeScript

Python

Go

Job description

Arena Intelligence is seeking a Senior Security Lead to design and lead the strategy and hands-on implementation of systems that protect the integrity of a multi‑million user AI platform. You will work across product, infrastructure, and data pipelines to proactively identify risks and embed security into core features.

You will write code, build tools, and design frameworks that make security an integral part of the product’s DNA, mentoring engineers and advancing secure-by-default practices