Frequently Asked Questions: Legacy Modernization
How do you ensure zero-downtime during cutover?
We use Blue-Green or Canary deployments where the new system runs parallel to the legacy system. Traffic is gradually shifted (e.g., 5% → 25% → 50% → 100%) while monitoring metrics in real-time. Anomalies trigger automatic rollback within seconds.
What happens to my data during migration?
We use CDC (Change Data Capture) with tools like Debezium to synchronize data changes in real-time. Dual-write mechanisms and checksum validations ensure data consistency. Before cutover, we perform restore tests and document rollback procedures.
How do you meet compliance requirements (GDPR, SOC2)?
Security is integrated into every phase: IAM/RBAC for access control, HashiCorp Vault for secrets management, complete audit logs, and zero-trust networking. PII data is handled according to data residency requirements. We document all compliance-relevant measures for audits.
How do you measure migration success?
Before migration, we jointly define SLOs (e.g., 99.9% availability, P95 latency < 200ms). We implement monitoring dashboards with error budgets, automated alerting, and incident runbooks. Post-migration reviews compare actual performance against defined targets.
What's your rollback plan if something goes wrong?
Every migration has a documented rollback plan with clear triggers (e.g., error rate > 1%, latency > SLO). With Blue-Green, rollback is a DNS switch in seconds. We conduct rollback drills before go-live and train your team on the runbooks.
What infrastructure options do you offer?
Depending on requirements: Kubernetes (EKS/GKE) for complex workloads with autoscaling and service mesh, or Serverless (Vercel/AWS Lambda) for event-driven architectures. Both options with HA/DR concept, defined RTO/RPO, and regular disaster recovery tests.