Senior Security Engineer; NYC​/MIA

About Crossmint

Crossmint is the leading enterprise‑grade, all‑in‑one stablecoin and wallet infrastructure platform enabling fintechs and enterprises to integrate stablecoin rails and smart wallets with speed, compliance, and scale.

Location: NYC or Miami. Hybrid office setting.

Type of Employment: Full‑time

Salary range: 180, USD

Note: We determine candidate levels through insights gained during the interview process.

We are seeking a Senior Security Engineer to own the operational execution of security at Crossmint as we continue to scale. The volume of security operations, compliance work, and engineering support requires dedicated ownership to maintain a strong security posture as the company grows.

This role is foundational. You will run the day‑to‑day security function, partnering closely with engineering, compliance, and external vendors to ensure our infrastructure, applications, and processes remain secure. This role enables security leadership to focus on strategy, automation, and long‑term risk management while you ensure operational excellence and follow‑through.

• Own and operate cloud security across our cloud environments: AWS primarily, with some exposure to GCP, Vercel.
• Design, maintain, and monitor engineering security controls including cloud IAM, logging, monitoring/alerting, and key management.
• Secure our coding assets, including: CI/CD pipelines, Git Hub Action environments, secrets management, and software supply chain.
• Manage security‑related access controls including privileged access, service accounts, credential rotation, and performing access reviews.

• Perform secure code reviews and provide hands‑on application security support to engineering teams.
• Review authentication flows, payment logic, and API security with human judgment, not just automated scanners.
• Partner with engineers to remediate vulnerabilities and embed security best practices into product development.
• Coordinate our external security review program with our 3P security auditor firms.

• Own vulnerability management workflows including prioritization, remediation tracking, and verification.
• Support incident response through internal triage, investigation, and remediation in collaboration with external 24/7 response partners.

• Support SOC 2 and other compliance efforts by collecting evidence, documenting controls, and maintaining audit‑ready processes for engineering‑security related controls.
• Contribute to regulatory and compliance initiatives such as DORA, where applicable.

• 4‑8 years of experience as a security engineer. 3+ years of hands‑on experience securing AWS environments or equivalent cloud, including IAM, Security Hub, Cloud Trail, Guard Duty, and KMS.
• Strong understanding of CI/CD security, including Git Hub Actions, secrets scanning, and dependency management.
• Experience with secure code review or application security fundamentals.
• Experience working with at least one compliance framework, preferably SOC 2, though ISO 27001 or similar is acceptable.
• Highly organized with great attention to detail. You don’t drop balls.
• Comfort operating in a fast‑paced startup environment with ambiguity.
• Ability to communicate security concepts clearly to non‑technical stakeholders without creating friction.
• Experience using AI‑assisted tools such as Claude or Git Hub Copilot for security automation.
• Ability to work flexible hours if an incident arises.

• Fintech or payments industry experience.
• Exposure to DORA or MiCA compliance requirements.
• Familiarity with crypto or blockchain security considerations.

This is the full list of everything we’re looking for. You don’t need to check every single box to be a strong candidate, and having a good number of these would already indicate a solid fit for the role.

• Take a security issue from identification through remediation with minimal guidance.
• Prioritize work based on risk and impact, not who is asking the loudest.
• Document work clearly to support audits and long‑term…