Professional services organisation: Automating large-scale document classification with AI

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A professional services organisation needed to reorganise and migrate more than 250,000 documents from an inconsistent document management system. The work had to improve accessibility, support compliance and reduce the manual effort usually required to classify, rename and move large volumes of documents.

An AI-powered classification, renaming and migration solution was built to standardise folder structures, improve document consistency and automate work that would otherwise have required thousands of manual hours. The result was a faster, more controlled migration across hundreds of clients.

Outcome 1: Classified, normalised and migrated 250,000+ documents across 249 clients
Outcome 2: Achieved 90%+ AI classification accuracy across the migrated document set
Outcome 3: Implemented 149 standardised folder structures to improve consistency across client files

The challenge

Our client was managing a large volume of documents across inconsistent folder structures, naming conventions and legacy file types. This made information harder to access, increased the risk of duplication or misclassification and created a significant manual burden for teams.

The migration also needed to be controlled and compliant. Documents had to be extracted, renamed, moved, verified and archived in a way that preserved traceability and produced regulatory-ready documentation across a large client base.

The approach

The programme began with the development of an AI-powered classification engine using Azure OpenAI GPT-4.1 models. Custom correction mechanisms were introduced early to improve misclassification handling and create greater confidence in how documents were categorised at scale.

From there, our team designed an intelligent renaming system aligned to our client’s existing document conventions. This helped standardise naming patterns and establish a more consistent folder structure across client records, reducing fragmentation across the broader migration effort.

To support the complexity of the migration, multi-format document pipelines were developed for PDFs, DOC/DOCX, XLS/XLSX, MSG and RTF files, with OCR through Tesseract used for scanned content. Text extraction and conversion frameworks were also tailored to VDI constraints and legacy file types so documents could be processed reliably across a wide range of formats and environments.

The migration capability was then expanded into a more robust automated workflow that handled physical file movement, verification, duplicate detection, collision handling and archiving. Client-specific reporting was also produced through CSV mappings, completeness checklists and Excel outputs with hyperlinks between old and new folder locations, helping maintain traceability throughout the migration process.

Together, these capabilities created a more controlled migration process that could reliably classify, rename and move large volumes of documents across complex client environments.

The impact

Our client moved from a highly manual document migration process to an automated capability that could classify, normalise and migrate hundreds of thousands of files at scale. Work that would have required thousands of manual hours was accelerated, reducing administrative burden while improving consistency across client records.

Accessibility and compliance also improved. Teams had clearer folder structures, more consistent naming and regulatory-ready documentation to support future retrieval, review and governance requirements. Additionally, we were able to identify any missing client documents that were essential to fulfilling regulatory requirements, but had not made it within the folder structures initially.

The work established a scalable processing capability across 249 clients, giving our client a more reliable way to manage complex document migration, reduce manual effort and maintain control over information as volumes grow.