[Remote] Senior Platform Security Engineer | Series B Fintech | Remote (US/Canada) or Hybrid NYC, $210k–$240k base + meaningful equity

Note: The job is a remote job and is open to candidates in USA. Space Executive is recruiting for an unnamed Series B fintech building data and AI infrastructure for financial services. The Senior Platform Security Engineer will own security for the production edge connecting the platform to enterprise banks, including certificate infrastructure, private network connectivity, webhook security, vulnerability remediation, and secure-build standards.

Responsibilities

• Own and operate mutual-TLS certificate infrastructure for enterprise bank onboarding
• Build the security workflow for private network connectivity, including tenancy mapping and connection monitoring
• Run webhook delivery security: signing-secret rotation, client-cert management and failure response
• Drive vulnerability remediation end-to-end, from scanning through verified closure
• Set and codify secure-build standards across engineering

Skills

• 6+ years in platform, infrastructure or network security with hands-on ownership of production systems
• Deep PKI and certificate lifecycle experience
• Strong TLS/mTLS knowledge
• Hands-on AWS networking and security
• Working knowledge of OAuth 2.0 (client-credentials, JWT validation) and certificate-bound tokens
• A track record of setting security standards and getting engineering teams to adopt them
• Fintech/payments or bank network integration experience
• AWS CDK
• PCI DSS or SOC 2 control implementation
• Time on a small or early-stage security team

Benefits

• Meaningful equity
• Early exercise and extended post-termination option window
• 100% paid medical, dental and vision premiums
• 401(k)
• 12 weeks fully paid parental leave
• Unlimited PTO
• Fully remote across the US and Canada, or 1–2 days a week in the NYC office

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