Enterprise Platform Migration: Marketo → Iterable
National Healthcare Screening Provider · B2C Retention · HIPAA Environment
The Challenge
A legacy Marketo instance architected for B2B lead management was being forced to process high-volume B2C transactional data for a national health screening business. The result was compounding technical debt: data latency from forcing transactional volume through a rigid relational model, brittle syncs between the platform and the system of record, and a contractual 8% annual cost escalator approaching $372K/year. When Marketo granted only a 6-month renewal as a one-time concession, I used that window deliberately to fund the migration rather than accept another 12-month lock-in.
The Architecture Decision
After evaluating every vendor, I selected Iterable on three criteria: a schema-less JSON data model that mapped marketing logic directly without forcing transactional data into relational fields; multi-channel capability (Email + SMS + Push) that Marketo couldn't offer; and scaling-based pricing I could tie to business milestones. I structured a 2-year locked contract with growth tiers built in: 4.5M to 5.5M profiles, 540M to 660M sends. Spend tracked with business growth, not vendor leverage.
The Vendor Strategy
The commercial structure was part of the architecture. I negotiated a 6-month Marketo bridge term to fund the migration window, avoiding a 12-month commitment to a platform we were leaving. I then replaced the compounding 8% escalator with predictable, scaling-based pricing the CFO could forecast across the full contract term. Predictable cost was a design requirement, not an afterthought.
The Execution
I retained the proprietary HIPAA-compliant CRM as the system of record throughout. PHI was never ungoverned during the dual-platform period. I upgraded identity resolution from fragile email + first-name deduplication to deterministic UUID via the CRM's internal ID. I flattened Marketo's nested custom objects into optimized JSON payloads at the API perimeter. A phased 45-day IP warmup preceded a full parallel dual-run cutover, both platforms live and validated simultaneously, before sunsetting Marketo on schedule in March 2023.
The Result
~$134K lower annual platform cost (36% reduction vs. Marketo run-rate). Zero unscheduled downtime. The email channel responsible for 50% of company revenue was never interrupted. Added 1.5M profile capacity (4.0M → 5.5M) and opened SMS, mobile push, web push, and in-app as net-new channels. Delivered on schedule.