Switchboard Cutover: ERP Traffic‑Shadowing & Dual‑Write Orchestrator
10/10
Demand Score
Downtime during ERP SaaS cutover can cost thousands per minute and trigger SLA penalties; leadership mandates near‑zero RTO/RPO.
9/10
Blue Ocean
Competition Level
$5k-25k
Price/Month
Predicted customer spend
10 days
Time to MVP
Difficulty: Hard
The Problem
SaaS Migration Downtime
Competitor Landscape
- Cutover
- LaunchDarkly
- Azure API Management
- nginx/HAProxy traffic mirroring
- SNP CrystalBridge (SAP)
- Datadog/AppDynamics (observability)
Must-Have Features for MVP
Traffic shadowing proxy with schema/payload translators
Configurable dual‑write with deduplication and causal ordering
Reconciliation ledger with three‑way diff (legacy vs SaaS vs ledger)
Progressive traffic ramp and feature flags per transaction type
Dry‑run simulator with synthetic workload generation
Automated backout plan and data undo/compensation where safe
Granular dashboards for parity, RPO/RTO, and exception queues
Signed audit logs for compliance (SOX/GxP)
⚠️ Potential Challenges
- Legal constraints on dual‑writing to SaaS in parallel
- Idempotency gaps and ordering differences across ERPs
- API quotas and burst limits during replay
- Identity and reference data mapping between systems
- Complex backout criteria for financial postings
Risk Level: High
🎯 Keys to Success
- Cutover executed with <5 minutes user‑visible impact
- >99.95% data parity before 100% traffic shift
- Backout possible within 15 minutes and fully audited
- No P1 incidents from ordering/idempotency violations
- Clear, CFO‑grade reconciliation reporting day‑1 post‑cutover
Ready to Build This?
This hard-difficulty project could be your next micro-SaaS success.