ERP for Medium Business — multi-warehouse, multi-company, BI
ERP for medium business is a custom-built platform for companies with 50-300 employees, 2-15 warehouses and several legal entities under one roof. We unify procurement, production, sales, finance and HR into one data graph with role-based access, approval workflows and a real-time BI layer. We deliver in phases over 4-9 months, on your own backend with no per-user monthly license fees.
What the ERP includes
Unlike SAP Business One or Microsoft Dynamics 365, our ERP system is designed around your processes, not the other way around. You get source code, owned data and an architecture that scales without an expensive license swap at the 100th, 200th or 300th user.
- ✓Multi-warehouse, real-time stock — manage 2-15 locations with automated replenishment, inter-warehouse transfers, serial numbers, lot tracking, FIFO/FEFO/LIFO and mobile barcode/RFID scanning.
- ✓Multi-company consolidation — run 2-10 legal entities in parallel with intercompany invoicing, consolidated P&L and balance sheet, separate IFRS/local charts of accounts and EUR-ready ledgers.
- ✓Advanced workflow engine — BPMN-style approvals for purchase orders, leave, expenses and contracts, with configurable rules (amounts, departments, deputies), full audit trail and SLA timers.
- ✓Business Intelligence layer — embedded dashboards for the CFO, COO and operations leads with 80-120 KPIs, an OLAP cube over every transaction, drill-down to invoice level and export to Power BI or Metabase.
- ✓CRM and sales pipeline — 360° customer profile, lead scoring, quotes, contracts, subscriptions and quota tracking, integrated directly with invoicing and stock without double entry.
- ✓Production and services — BOM, work orders, capacity planning, project module with time tracking and cost-plus pricing for companies that combine manufacturing, services and trade.
- ✓HR and payroll foundation — org structure, job profiles, payroll with local tax authority integration, performance reviews and onboarding/offboarding workflows.
- ✓API-first architecture — every module exposes REST and webhooks, with prebuilt connectors to Microsoft 365, Google Workspace, banking systems, e-invoicing, cloud storage and courier platforms.
Who it is for
Regional distributors with a central warehouse and 4-12 satellite locations. The ERP syncs stock every 60 seconds, cuts inter-warehouse transfers by 35-50% and prevents out-of-stock on top-100 SKUs via automated min/max replenishment per site.
Groups of 3-8 entities — manufacturing, assembly, service, leasing, trade — where a single order hops between two legal companies. The system auto-issues intercompany invoices, moves stock between warehouses of different VAT IDs and consolidates monthly P&L for the CFO.
Agencies, IT firms and SaaS businesses with 80-250 people, project work and subscription billing. The ERP runs resource planning, role rates, project margin and MRR/ARR metrics in one place — not three disconnected tools.
How we build it
Rolling out an ERP for a 50-300 person company is not software installation — it is process reengineering. So we work in phases, with locked scope and budget, and ship modules one by one instead of a big-bang go-live, which fails on 60% of ERP projects.
1. Process audit and blueprint (4-6 weeks)
A business analyst and a solution architect interview 15-25 key users — CFO, warehouse leads, sales, production, HR. We document 80-150 processes in BPMN and flag manual steps, duplications and Excel islands. Output: a blueprint with prioritized modules, migration plan and a fixed budget commitment.
2. Architecture and foundation (6-10 weeks)
We build the core — multi-tenant model for multi-company, RBAC with 20-40 roles, audit log on every change, EUR-ready chart of accounts and base master data. Hosted on your own server or managed Kubernetes in AWS eu-central-1, with PostgreSQL partitioning, Redis cache and S3-compatible document storage.
3. Phased rollout per module (3-6 months)
We launch Finance + warehouse first, then CRM + sales, then production, then HR. Each sprint ends with a real user acceptance test and training. Legacy systems run in parallel for 30-60 days while data and users migrate, so there is never a day when the company stops working.
4. Data migration and integrations
We import 3-7 years of history from the legacy ERP or accounting tool, then wire up bank feeds, POS terminals, Shopify/WooCommerce stores, marketplaces and the accounting export. Every integration is tested on a staging environment before it touches production.
5. Hypercare and continuous evolution
After go-live you get 60 days of hypercare with a 2-hour SLA on critical issues. We train super-users per department who become the internal first line of support. Then we move to a quarterly release cycle — new reports, new workflows, new integrations. The ERP is never "finished" — it grows with the business.
Why Saitami
Prices are fixed in EUR and scale with scope — €18,000-€60,000 for the rollout, no per-user monthly fees. Looking for the wider business software picture for a mid-market company? See also custom software for modules that off-the-shelf ERPs simply do not have.
Frequently Asked Questions
Why a custom ERP instead of SAP Business One or Microsoft Dynamics 365?
SAP B1 and MS Dynamics 365 cost €120-€220 per user per month — for 150 users that is €18,000-€33,000 monthly or €216,000-€396,000 a year in license alone. By year three you are at €600,000+ versus a one-time €40,000-€60,000 with us plus hosting. A custom ERP also fits your processes, while packaged systems force you to fit theirs — usually via expensive consultants for every exception.
How much does ERP for medium business cost?
€18,000-€60,000 one-time, depending on module count and integration complexity. The minimum package (€18,000) covers Finance, one warehouse, CRM, 30 users, migration from one source and 60 days of hypercare. The full enterprise scope (€60,000) adds multi-company consolidated finance, up to 10 warehouses, the BI layer, production and HR. Hosting and support run €350-€1,200 per month based on infrastructure.
How long does it take from kickoff to go-live?
4-9 months for a 50-300 person company, depending on module count and legacy data quality. The first module (usually Finance + warehouse) goes live in 10-14 weeks. The rest follow in phases over 4-6 months, so the business never stops for a big-bang migration. About 80% of failed ERP projects are big-bang — which is why we do not work that way.
Who owns the code and the data after go-live?
You do. You get full source code in your own Git repository, the database lives on your server (on-premise or your cloud account) and there is no lock-in. If two years later you want to move to a different dev team, you have the documentation, tests and architecture diagrams to do it without rebuilding. That is a critical difference versus SaaS ERPs where your data lives in someone else's infrastructure.
Can the ERP scale when we hit 500-1,000 employees?
Yes. The architecture is horizontally scalable — PostgreSQL with read replicas, Redis cluster, Kubernetes for the app tier. We have tested deployments at 1,200 concurrent users and 50M+ transactions a year. When needed we add modules for ERP for manufacturing or ERP for trade on the same data graph. Smaller companies start with ERP for small business and migrate up once they cross 50 people.
Ready for ERP for medium business that scales with you?
Send a short company brief — headcount, legal entities, warehouses, current systems. Within 5 business days we ship a process audit with prioritized modules, a fixed budget and a realistic timeline to go-live.
Request a process audit →Related services: ERP system · business software · custom software