Senior Staff Information Security Engineer

NMI is a company that enables partners with choice in payments technology, and they are seeking a Senior Staff Information Security Engineer to enhance security across their hybrid technology environment. The role involves providing technical leadership in security architecture, improving cloud and hybrid security, and collaborating with engineering and product teams to implement effective security measures.

Responsibilities:

• Define and evolve security architecture across AWS and our colocation estate
• Establish secure reference architectures, engineering standards, and reusable control patterns
• Provide technical leadership for major infrastructure, platform, and product initiatives
• Identify systemic risks and lead practical, sustainable programmes to address them
• Design and improve security across cloud accounts, networks, identities, workloads, and shared services
• Establish effective controls for identity and access management, segmentation, encryption, secrets, logging, monitoring, and workload protection
• Develop preventative guardrails through infrastructure-as-code, policy-as-code, automation, and cloud-native security services
• Improve consistency across the enterprise including cloud, on-premises infrastructure, and the connectivity between them
• Engage early in the design of new products, platforms, services, and integrations
• Lead threat modelling, security architecture reviews, and technical risk assessments
• Translate security risks into clear, practical engineering recommendations
• Help teams adopt secure-by-design principles through reusable patterns, tooling, and documentation
• Design and implement security tooling, integrations, and automated controls
• Embed security capabilities into infrastructure provisioning, engineering workflows, and CI/CD pipelines
• Use AI-assisted tooling to improve scripting, detection development, alert analysis, vulnerability triage, threat modelling, and technical documentation
• Validate AI-generated outputs and ensure AI tools are used with appropriate controls for confidentiality, accuracy, access, and human oversight
• Provide technical direction for vulnerability and exposure management across AWS and on-premises infrastructure
• Identify recurring patterns across incidents, penetration tests, vulnerabilities, and control assessments
• Act as a senior technical escalation point during significant security incidents
• Ensure investigations and lessons learned result in durable architectural and engineering improvements
• Lead complex security initiatives spanning multiple teams and planning cycles
• Mentor security engineers and provide guidance to engineers in adjacent teams
• Raise the standard of security architecture, automation, documentation, and technical decision-making
• Communicate security risks and recommendations clearly to technical teams, product leaders, and senior stakeholders

Requirements:

• Significant experience in security engineering, infrastructure security, cloud security, security architecture, or platform engineering
• Deep, hands-on experience securing AWS environments
• Strong knowledge of AWS identity and access management, network architecture, account governance, encryption, logging, monitoring, secrets management, and workload protection
• Experience designing or securing on-premises, data-centre, or colocation-hosted infrastructure
• Strong knowledge of enterprise networking, segmentation, firewalls, secure remote access, privileged administration, and hybrid connectivity
• Experience with infrastructure-as-code, CI/CD security, containerised environments, and cloud-native platforms
• Demonstrated experience designing and implementing automated security controls and engineering solutions
• Proficiency with scripting or software development using Python, Go, or a comparable language
• Practical experience using AI-assisted tooling to improve security engineering and operational workflows
• Experience leading complex initiatives across multiple engineering, infrastructure, or product teams
• Strong knowledge of security architecture, threat modelling, vulnerability management, detection, and incident response
• The ability to operate independently, navigate ambiguity, and influence decisions across technical and leadership audiences
• An advanced AWS certification in security, architecture, networking, or cloud engineering
• Experience in fintech, payments, SaaS, or another regulated technology environment
• Experience securing large or complex AWS multi-account estates
• Experience with Kubernetes, container security, software supply-chain security, and policy-as-code
• Experience with technologies such as CNAPP, CSPM, SIEM, EDR, DLP, WAF, vulnerability-management, network-security, or secrets-management platforms
• Familiarity with PCI DSS, SOC 2, GDPR, NIST, or ISO 27001
• Experience supporting significant security incidents, penetration tests, audits, or customer security assessments