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Data Modeling

You can't manage what you can't see. We model your business data — from concept to physical database — so systems are born right and grow without rework.

Illustration: entity-relationship diagram — data modeling

Why model before you build

Nobody builds a building without a blueprint. Yet every day systems are born without a data model — and the bill arrives: duplicated fields, business rules scattered through code, impossible migrations and a database nobody has the courage to touch. The data model is the blueprint of your system. Done upfront, it costs days. Fixed afterwards, it costs months.

What we do

We work across all three layers — conceptual (the business, no technology), logical (entities, relationships and normalization) and physical (the real database, tuned to your platform) — always accompanied by the data dictionary: every table and column with its name, meaning and rules documented. We also travel the road in reverse: reverse engineering of legacy databases, rebuilding the model and dictionary that were never documented — nowadays accelerated by AI, which reads structures, proposes meanings and flags anomalies for our human validation.

For BI projects, we design dimensional models (star, snowflake) that make Power BI fly instead of crawl.

Physical data model of an LMS in ERwin Data Modeler: dozens of related tables organized into subject areas by business domain
Real project: the physical model of a learning management system (LMS) in ERwin Data Modeler — note the subject areas on the left: each business domain (enrollment, assessment, forums, surveys…) has its own navigable area. A large model doesn't have to be a confusing one. Click to enlarge.
Physical model of a unified Person registry in ERwin: normalized addresses, phones, e-mails, roles and relationships
Unified Person registry: normalized addresses, contacts, roles and relationships — the same customer never exists twice, and the same model serves CRM, finance and contracts. Click to enlarge.

An investment that pays for itself

Every hour of modeling saves ten hours of maintenance. It's the IT service with the best silent return: when done well, nobody notices — systems simply work, reports match, and changes don't break anything.

What you get

  • Conceptual model validated with the people who know the business (you)
  • Normalized logical model with explicit integrity rules
  • Physical model tuned to your DBMS (Oracle, SQL Server, PostgreSQL, MySQL…)
  • Documented reverse engineering of undocumented legacy databases
  • Dimensional models ready for BI and analytics
  • Versioned DDL scripts and browsable documentation
Keep exploring 🚚 Data Migration →