---
title: "Document Annotation for Financial Services"
description: "From contracts to inheritance certificates, we annotated 6,000+ legal documents with high precision and custom validation logic."
url: "https://unidata.pro/cases/document-annotation-for-financial-services/"
date_modified: "2026-05-14T10:48:22+03:00"
language: "en-US"
---
Task
----

The client requested the annotation of legal documents using Label Studio. The goal was to highlight key legal entities (such as seller, buyer, alienated right, and representative) and accurately establish relationships between them.

Key challenges included:

- Complex legal language and conditional constructions
- High sensitivity to errors — missing or misinterpreting even one word could distort the annotation
- Lack of standardization across documents (contracts, inheritance certificates, etc.)

Solution
--------

### Preparation and workflow organization:

- Developed detailed technical guidelines tailored to 20+ annotation scenarios
- Created a document with Q&A updates from the client to clarify edge cases
- Provided annotated examples with screenshots for each entity type
- Recorded training videos and provided personalized video feedback on initial tasks
- Implemented a helpdesk-style internal communication channel for quick resolution of questions

### Data annotation:

- Annotators identified core legal entities and manually mapped relationships (e.g., linking an alienated right to both the seller and the asset)
- Ensured structural consistency (e.g., linking a representative to the main party in the transaction)
- Used Label Studio for precise control over annotation fields and linkage logic

### Quality control:

- Each document was reviewed by validators, who provided structured feedback
- Errors were described in detail in validation spreadsheets and returned for correction
- Continuous feedback loops improved overall annotation quality over time

## Hero

**Industry and Use Case:** Financial Industry **Data:** 6,000+ complex legal documents **Project Duration:** 7 weeks

## Main Title

Document Annotation for Financial Services

## Description

For one of our LegalTech clients, we annotated over 6,000 complex legal documents to extract entities and logical relationships between them. The project required a customized annotation pipeline due to the specific logic of legal texts, where a single word can alter the meaning of an entire clause.

## Progress - Results - Quote

### Progress - Steps

**List of Steps:**

- **Number of days:** Pilot & Team Selection — **Step Description:** 7 days
- **Number of days:** Guidelines & Client Alignment — **Step Description:** 10 days
- **Number of days:** Collection & Annotation — **Step Description:** 28 days
- **Number of days:** QA & Final Delivery — **Step Description:** 7 days

### Results

**List of Results:**

- Annotated over 6,000 legal documents with high precision, ensuring correct entities and relationships
- Improved annotator skills through continuous training, example reviews, and weekly calibration sessions
- Established a reliable workflow for complex legal logic, allowing consistent annotation across diverse document types
- Maintained quality and consistency across a high-complexity dataset

### Quote

**Quote:** Legal documents are highly sensitive to even minor errors. Carefully selecting experienced annotators and maintaining continuous feedback with the client was crucial to achieving precise entity and relationship mapping across 6,000 documents.

**Author:** Albina Romanova

**Position:** Head of SLM&LLM Annotation

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