Estate baseline
A functional estate that prices change in months.
- $55.0M
- Annual run rate · $1.28 PMPM
- 9.55M
- In-scope LOC in a 22M LOC environment
- 6,628
- MIPS · vendor-operated mainframe
- 140h/wk
- Batch plus 168h OLTP
Baseline: January 2026 strategic business case and April 10, 2026
mainframe migration assessment kickoff. COBOL, JCL, and DB2 skills are concentrated in a diminishing
talent pool; the managed-services contract runs to 2030.
Dual-track bet
Modernize the platform and infuse AI across delivery—at the same time.
Track 01Modernize the platformShrinks the legacy surface
Track 02Infuse AI across deliveryCompresses build time
ConvergenceCloud-native, AI-governed platform estate
Modernization economics
A 52% run-rate reduction target, recognized only on retirement.
The business case moves the estate from $55.0M to a $26.5M target annual
run rate—$1.28 to $0.60 per member per month. Savings count only when workloads are verifiably
retired, not when code is migrated.
Current run rate$55.0M
Mainframe decommission−$18.5M
Ensono exit path−$8.0M
AI and operations efficiency−$14.0M
Cloud and AI run cost+$12.0M
Target run rate$26.5M
- $4.5M
- Phase-one foundation ask
- $11.5M
- Total programme
- 14 months
- Payback target
- $28.5M
- Annual savings by FY30 · modelled
Source basis: WHPS AI Transformation strategic business case, January
2026. All figures are modeled targets in that business case, not realized savings.
Exit doctrine
The last constraint is a dependency, not an application.
A proposed five-play doctrine for engineering the mainframe out from
under live platforms—sequenced on evidence, not on calendar. Self-perform the application build the
programme has already proven; use vendor capability only where it closes a real gap.
- Extract the business rules
- Flip data sovereignty domain by domain
- Decompose the batch estate by job class
- Carve out payment processing last with penny-level reconciliation
- Gate every cutover on dual-run parity evidence