LabelFlow — Data Annotation & QA Platform
LabelFlow — Data Annotation & QA Platform
A scalable data annotation platform that manages the full labeling lifecycle with multi-level quality assurance, task orchestration, and integrated payment workflows.
Project Overview
A scalable data annotation platform that manages the full labeling lifecycle with multi-level quality assurance, task orchestration, and integrated payment workflows.
System Architecture
Multi-Stage Workflow Engine
Task Ingestion & Splitting
L1 Annotation Queue
L2/L3 Review Pipeline
Escrow Payment Engine
Audit & Logging Layer
Upload → Split → L1 Annotate → L2 Review → L3 Approve → Export + Payout
Security
- JWT-based authentication with role scopes
- Task locking prevents concurrent annotation conflicts
- Full audit trail for every state transition
- Escrow model ensures payment integrity
Performance
- Queue workers handle parallel task processing
- Database-level row locking for task state integrity
- Timeout-based task recovery prevents queue stalls
System Capabilities
Deployment & Portability
Queue-based task distribution for horizontal scaling
Configurable retry and timeout policies per task type
Pluggable storage adapters for S3/GCS/Azure
Core Features
End-to-end annotation lifecycle (upload → split → annotate → review → payout)
Multi-level QA system (L1 annotators, L2/L3 reviewers)
Task orchestration with locking, timeout, and retry mechanisms
Role-based access control and workflow enforcement
Escrow-style payment system with audit tracking
Scalable task distribution and parallel processing
Comprehensive audit logs for all actions and transitions
Support for multi-modal data (text, image, video, audio)
Project Impact
Designed production-grade workflow engine for annotation systems
Ensures data quality via structured multi-stage review pipeline
Integrates operational workflows with financial systems (payments + escrow)
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System Architecture
Multi-Stage Workflow Engine
Task Ingestion & Splitting • L1 Annotation Queue • L2/L3 Review Pipeline • Escrow Payment Engine • Audit & Logging Layer
Flow: Upload → Split → L1 Annotate → L2 Review → L3 Approve → Export + Payout
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