Escape the Legacy Complexity of SAP Monoliths
A secure, serverless Next.js and Postgres database deployment designed to bypass the licensing tax of SAP S/4HANA — with 100% code ownership at handover.
Lock-in profile: Extreme (ABAP ecosystem, complex upgrade lockouts)
Quick Answer
In short: ERPStack provides a custom, license-free alternative to SAP S/4HANA. You get 100% data and IP ownership, zero seat-based fees, and a dedicated cloud deployment delivered in weeks.
Migration Blueprint Specification
- Typical Annual Cost
- $100,000 - $1,000,000+ / year (2026 list pricing)
- Modularity
- Very Low (Complex database dependencies, legacy tables)
- Customization Limits
- Highly rigid (Requires multi-month custom consulting cycles)
- Extraction Pathway
- Headless API encapsulation and progressive microservices extraction
The Escape Plan
Strangler Fig Pattern Setup
Deploy API gateway to proxy requests between legacy SAP and new microservices.
Module Extraction
Extract domains (e.g., HR, Inventory) one by one — phase 2 of the four-phase implementation timeline.
Data Lake Sync
Real-time replication from SAP HANA to PostgreSQL via Debezium.
Decommissioning
Turning off the legacy SAP modules permanently after 30 days of clean parallel-run validation.
Head-to-Head Architecture Matchup
7 of 7 capabilities shown
| Capability | Custom ERPStack build | SAP S/4HANA |
|---|---|---|
| Deployment SpeedOperations | Days/Weeks (Vercel Edge) | Months/Years (On-prem or SAP Cloud) |
| Developer EcosystemExtensibility | TypeScript / React / Node.js | ABAP / Proprietary SAP tools |
| Real-time AnalyticsData & Ownership | Embedded with ClickHouse/Materialize | Requires separate SAP BW/4HANA instance |
| Open Source StandardPlatform | ✓ Included | ✗ Not available |
| Manufacturing & Plant Maintenance (MRP/CMMS)Operations | MRP runs and CMMS maintenance scheduling engineered to your shop-floor requirements, with job costing for construction and project-based operations | PP and PM modules each licensed and configured separately |
| Business User ExperienceOperations | Role-specific React dashboards sized for the mid-size firm; user management and free read-only seats included | SAP GUI/Fiori access licensed per named user |
| Software Selection & ReviewsPlatform | One 2-week expert requirements audit replaces months of comparing vendors — the benefits and trade-offs land in a management-ready decision document | RFP cycles across analyst reviews, demo scripts, and integrator options |
Legacy Pain Points
- Multi-million dollar maintenance contracts
- Complex legacy DB tables with ABAP lock-in
- Extremely slow feature delivery times
The Custom Code Advantage
- Modern headless APIs replacing legacy backend complexity
- Dynamic static generation (Next.js) for high-speed reporting
- Agile feature delivery weeks instead of months
Uncovering Hidden Constraints
What we don't do
Hidden Cost: Consulting Fees — stacked on the $100,000 - $1,000,000+ / year (2026 list pricing) base license
What we do
SAP requires certified integrators. Minor UI changes can cost $50k+ in consulting hours.
What we don't do
Hidden Cost: HANA Memory Costs — stacked on the $100,000 - $1,000,000+ / year (2026 list pricing) base license
What we do
In-memory databases are incredibly expensive for cold/archival data. A custom build keeps hot data in PostgreSQL and archives cold records to object storage at a fraction of the per-GB cost — typically over 10x cheaper.
What we don't do
Hidden Cost: Service & Support Tiers — stacked on the $100,000 - $1,000,000+ / year (2026 list pricing) base license
What we do
SAP Enterprise Support lists at 22% of license value annually, whether or not you open a ticket. A custom system carries a flat service retainer the business can scale down or cancel after the switch.
What we don't do
Hidden Cost: Software Evaluation Cycles — stacked on the $100,000 - $1,000,000+ / year (2026 list pricing) base license
What we do
Choosing between S/4HANA editions consumes months of vendor research, user reviews, and integrator options before any build starts. Hire one team instead: a fixed 2-week requirements audit produces a management-ready decision document.
Calculate Your 3-Year IP Savings
Drag the team-size slider to model SaaS licensing spend against a fixed-cost custom build — implementation, hosting, and 3-year TCO update in real time.
- • Base Implementation: $55,000
- • License Taxation: $270,000
- • Data Ownership: Rented
- • One-Time Build: $55,000
- Custom Hosting (3 Yrs): $10,800
- Maintenance & Support (3 Yrs): $24,750
- 100% Code & Data Ownership
Staying on per-seat licensing costs you $6,513 every month at 50 seats — spend that never converts into owned IP.
Why Companies Left SAP S/4HANA
"Reduced deployment times from 6 months to 1 week by migrating HR modules away from SAP to a custom Next.js stack."
Frequently Asked Questions
Yes. We use an API encapsulation model to intercept legacy requests, allowing you to migrate modules progressively without disrupting active systems — most teams extract their first module within 4 weeks.
Yes, our architectures leverage serverless edge routing and decoupled databases engineered for 99.9%+ availability targets with multi-region failover.
The migration runs four phases: a 4-week strangler-fig gateway setup, module extraction over 3-6 months, continuous data-lake sync via Debezium, and a final decommissioning month. Each extracted module passes a validation checklist — reconciled row counts, parallel-run comparisons, and user-acceptance sign-off — before the legacy SAP module switches off. Progressive extraction keeps active operations running throughout.
A mid-size firm facing a six-figure S/4HANA renewal is the usual candidate: hire one engineering team, run a 2-week requirements audit, and get a fixed quote — the benefits include zero named-user licensing, React dashboards your staff actually adopts, and module-by-module migration with no big-bang risk. Enterprises deeply invested in ABAP customizations may still be better served renewing.
Stop Renting SAP S/4HANA. Build Your Own.
Discuss a progressive migration pathway in a 30-minute architecture call — 100% of the code and IP transfers to you.
Request Architecture Blueprint