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Security Architecture — Zero-Trust Defense & Incident Response

Layered security: perimeter defense → identity & access → data protection → threat detection → incident response → compliance · securing fintech infrastructure handling $500M+ in transactions

Edge protection
CloudFront WAF
DDoS mitigation
Bot management
Geo-blocking
Rate limiting
Network segmentation
VPC isolation
Private subnets
Security groups
NACLs (stateless)
VPC flow logs
API security
mTLS (service mesh)
API key rotation
OAuth 2.0 / OIDC
CORS policies
Request signing
DNS security
DNSSEC enabled
DNS filtering
Certificate pinning
CT log monitoring
Domain monitoring
Firewall rules
OWASP Top 10 ✓
SQL injection block
XSS prevention
SSRF protection
Custom rule sets
Authentication
MFA (mandatory)
Biometric (mobile)
SSO (Okta)
Passkeys (WebAuthn)
Session management
Authorization
RBAC (role-based)
ABAC (attribute)
Least privilege
Just-in-time access
Permission boundaries
Service identity
IAM roles (AWS)
Service accounts
Pod identity (K8s)
Workload identity
Token rotation
Privileged access
PAM (CyberArk)
Break-glass procedure
Session recording
Approval workflow
Time-boxed access
Access reviews
Quarterly review
Orphan detection
Excessive privilege
Auto-revocation
Compliance report
Encryption at rest
AES-256-GCM
KMS managed keys
Envelope encryption
Key rotation (annual)
HSM-backed (FIPS)
Encryption in transit
TLS 1.3 (min 1.2)
Perfect forward secrecy
Certificate management
Internal mTLS
VPN (admin access)
Secrets management
AWS Secrets Manager
Auto-rotation
No secrets in code
Vault integration
Audit trail
Data classification
Restricted (PII/PCI)
Confidential (internal)
Internal use
Public
Auto-classification
DLP controls
Outbound scanning
Email DLP rules
Cloud storage scan
Endpoint DLP
AI output scanning
SIEM / SOC
Datadog SIEM
Log aggregation
Correlation rules
ML-based anomaly
24/7 monitoring
AWS security services
GuardDuty
Security Hub
Inspector
Macie (data)
Detective
Application security
RASP (runtime)
Dependency scanning
Container scanning
SAST / DAST
Supply chain audit
Fraud detection
Transaction anomaly
Account takeover
Synthetic identity
Velocity checks
Device intelligence
Threat intelligence
IOC feeds
Dark web monitoring
Phishing detection
Credential leaks
Sector-specific intel
Response playbooks
Data breach
Ransomware
Account compromise
DDoS attack
Insider threat
Response phases
1. Detect & triage
2. Contain
3. Eradicate
4. Recover
5. Post-mortem
Communication
PagerDuty alerts
War room (Slack)
Executive briefing
Customer notice
Regulator notify
Recovery
Backup restore
Failover activation
Credential reset
Service restoration
Validation testing
SLA targets
Detect
< 5 min
Contain
< 1 hr
Recover
< 4 hr
RTO
2 hr
RPO
15 min
Certifications
SOC 2 Type II ✓
PCI DSS Level 1 ✓
ISO 27001 ✓
SOC 1 (in progress)
Regulatory
GLBA compliant ✓
GDPR compliant ✓
CCPA / CPRA
NYDFS 500
Testing
Annual pen test
Quarterly vuln scan
Red team exercise
Tabletop exercise
Security culture
Security training
Phishing simulation
Bug bounty program
Security champions
Metrics
MTTR
42 min
Vuln SLA
98%
Incidents/Q
3
Training
100%