Senior Security Platform Engineer

WHO WE ARE Equinox is a category of one, setting the global standard for luxury health, wellness, and hospitality. Our spaces are intentionally elevated, our standards uncompromising, and our expectations high. We attract people who take pride in excellence, care deeply about quality, and want to be part of something that feels different the moment you walk through the door. We are builders, operators, and innovators who believe great environments and meaningful human connection change lives. Diversity, belonging, and ownership aren’t slogans here, they’re how we work. At Equinox, colleagues don’t just support the business; they shape the future of wellness. Because for us, it’s not fitness. It’s life. WHAT WE DO We create premium, immersive experiences where performance, hospitality, design, and human connection converge—and every detail matters. This is not a traditional fitness environment. It is a place where high standards, accountability, and pride in craft define the work. Fueled by an entrepreneurial mindset, we trust our people with real responsibility and real impact. Growth is earned through action, learning is hands‑on, and careers are built by those who want to operate at the highest level. At Equinox, we don’t just offer opportunities—we offer long‑term pathways for people who want to do meaningful work in an environment that expects more and delivers more. We are looking for a senior engineer who can operate at the intersection of cloud infrastructure, platform engineering, and security operations.  This is a hybrid role for an engineer who is equally comfortable debugging a Terraform module, tuning a SIEM detection rule, and leading an incident response investigation.  You'll be a primary technical escalation point for both platform reliability and security incidents across all cloud environments.  What You'll Do  Cloud Infrastructure & Platform Engineering  Own and maintain infrastructure-as-code across (e.g., Terraform) cloud providers, including shared modules used by application teams org-wide  Manage IAM users, keys, and secrets lifecycle (rotation, storage in Parameter Store/Secrets Manager, cross-environment consistency)  Diagnose and resolve production networking and infrastructure issues: load balancer health checks, security groups, WAF rules, CDN and origin access, DNS, and container orchestration  Administer access across supported platforms (e.g., AWS, GCP, GitHub, etc.) and internal developer tooling  Evaluate and integrate third-party platform/security tooling (e.g., CSPM, code security scanners)  Support CI/CD pipelines and troubleshoot build/deploy failures  SIEM & Detection Engineering  Own and operate the organization's Elastic Security (SIEM) platform end-to-end: cluster upgrades, agent/integration management, and log ingestion pipelines (cloud audit logs, identity provider logs, payment/fraud logs, WAF logs)  Design, build, and tune detection rules and alerting workflows, including integrating SIEM alerts into team communication channels (e.g., Slack)  Continuously improve signal quality by resolving log parsing errors, refining index patterns, and reducing false positives  Maintain technical documentation for logging architecture and detection rule logic  Security Operations & Incident Response  Provide technical leadership and day-to-day oversight for the SOC team, including prioritization, escalations, investigation quality and mentoring  Serve as a senior escalation point for the SOC, guiding and mentoring analysts through investigations  Lead investigations into anomalous authentication activity, account compromise, and suspicious network traffic, including coordinating remediation (session revocation, credential resets, user outreach)  Develop and maintain incident response runbooks and reference documentation  Build and maintain WAF-based detection and mitigation capabilities (e.g., fingerprint- and IP-based blocking of malicious/fraudulent traffic)  Identity, Access & Compliance  Drive identity governance initiatives, including cloud identity reconciliation (e.g., managed vs. unmanaged accounts) and license/access audits  Design and implement authentication hardening measures: conditional access policies, MFA/authentication strength requirements, and legacy protocol deprecation (e.g., legacy SMTP auth)  Partner with IT/security leadership on identity provider strategy and vendor licensing decisions  Application, AI & Code Ownership  Hold end-to-end security ownership across the organization's core application stack, spanning front-end (React Native, React Web), back-end (Node.js, Spring Boot/Java, Python/Flask), and AI/ML systems  Review code and architecture for security vulnerabilities (e.g., dependency/supply-chain risk, secrets handling, authN/authZ flaws, insecure API design) across mobile, web, and service layers  Partner with application engineering teams to embed security requirements into the SDLC — secure coding standards, PR review gates, and CI/CD security scanning (SAST/SCA/secrets detection)  Triage and drive remediation of vulnerabilities surfaced by code scanning and vulnerability management tooling (e.g., Wiz, GitHub Advanced Security) across the full technology stack  Maintain visibility into third-party/open-source dependency risk (npm, Maven/Gradle, pip) and coordinate patching for critical CVEs  Serve as the security point of contact for engineering teams building on React Native, React Web, Node.js, Spring Boot, and Python/Flask, ensuring consistent security posture regardless of language/framework  Own the security posture of AI/ML systems and LLM-powered features: model access controls, data governance for training/prompt data, prompt injection and jailbreak risk, and secure integration with third-party AI APIs and vendors  Evaluate and vet AI coding assistants and internal AI tooling for data exposure, IP leakage, and supply-chain risk before organization-wide adoption  Define and maintain security guardrails/review processes for teams building AI-powered features or agents, including monitoring for anomalous or abusive usage patterns  Fraud & Payments Security  Partner with risk and payments teams to investigate and mitigate payment fraud (e.g., card-testing/BIN attacks, risk-scoring anomalies in third-party payment platforms)  Analyze and recommend changes to fraud risk rules, allow-lists, and risk profiles  Track and help prioritize security remediation tickets related to payment endpoints  Required:  5+ years of experience in infrastructure/platform engineering, with hands-on production ownership in multi-account cloud environments  Strong Terraform/IaC experience, including authoring and maintaining shared modules  Experience operating a SIEM platform (Elastic Security preferred) — log ingestion, detection engineering, and alerting  Solid networking fundamentals: load balancers, security groups, WAF, DNS, CDN  Experience with identity providers (Entra ID/Azure AD, Okta, or similar) and authentication/authorization concepts (SSO, SAML, MFA, conditional access)  Demonstrated experience leading or heavily contributing to security incident response  Comfortable being a hands-on technical escalation point across multiple teams simultaneously  Working familiarity with application security practices across modern web/mobile and backend stacks (e.g., React/React Native, Node.js, Java/Spring Boot, Python/Flask) — able to read code, understand architecture, and identify security risk even if not writing production application code day-to-day  Preferred:  Proven experience with AWS, GCP and Azure  Familiarity with payments security concepts (fraud scoring, PCI-adjacent systems, payment gat

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