Sigma Data

The foundation of every great AI model is human-centered data

The foundation of every great AI model is human- centered data

Before a model can reason, generate, or respond — it must learn. Sigma Data delivers the high-quality, diverse, and 
human-annotated datasets your generative AI needs to perform with power and precision. From sourcing to synthesis, we provide the language-rich, bias-aware data that unlocks next‑level results.

Build AI that’s safe, secure, and ethically grounded

Generative AI is powerful — but without the right safeguards, it can expose your organization to serious risk.
Sigma Protection ensures your models are built on ethically sourced data, rigorously tested for vulnerabilities, and compliant with global data privacy standards.

What We Deliver

The right data, labeled the right way

We don’t just collect or label data — we shape it to align with real-world linguistic complexity, ethical standards, and domain-specific demands.

Core workflows include:

  • Data sourcing: Ethically collect diverse, representative datasets across domains and languages.
  • Data collection & enrichment: Capture audio, video, and text — then enrich it with semantic and cultural context.
  • Human annotation: Add high-precision labels including tone, syntax, sentiment, and intent.
  • Synthetic data generation: Create artificial examples to train and test LLMs on edge cases, rare patterns, and safety scenarios.
  • Bias mitigation: Actively identify and balance skewed data distributions.

Example workflow

+ The artifact

You receive 50 hours of transcribed user-agent support calls to prepare for training a voice assistant.

+ The task

Audit a sample to check for low-quality transcripts, including missing speaker turns, incorrect punctuation, or dropped segments. Flag for re-annotation and note impact on training data quality.

+ The impact

Even small transcription errors compound during model training. Human annotators catch flaws in source data quality that automated systems may overlook.

HOW WE DO IT

15+ years of expertise, millions of labels delivered

Sigma brings together trained linguists, domain specialists, and expert annotators who:

  • Source multilingual content in compliance with global standards
  • Manually transcribe, translate, and label data with 99%+ accuracy
  • Curate edge cases for safety-critical or underrepresented scenarios
  • Validate and refine synthetic data to reflect real-world conditions

Whether you’re building an enterprise chatbot or a global LLM, our human-in-the-loop approach ensures your model trains on what matters.

WHY IT MATTERS

Garbage in, garbage out

LLMs reflect the data they’re trained on. Poor-quality, unbalanced, or mislabeled data leads to:

  • Biased or harmful outputs
  • Hallucinated information
  • Misunderstandings and failures in production
  • Damage trust in your brand.

With Sigma Data, you unlock:

  • Faster time to quality training datasets
  • Reduced model hallucination and error rates
  • Greater generalization across languages, formats, and domains
  • Ethical, explainable, and inclusive AI systems

Get the essential guide to accelerating gen AI

Get the essential guide to accelerating gen AI

The promise of generative AI is massive — so why are most projects stuck in pilot? Backed by extensive third-party research, learn the data challenges slowing gen AI initiatives, and five proven strategies to overcome them.

Download the white paper ->
Accelerating whitepaper

Discover the new standards for AI quality

Discover the new standards for AI quality

The promise of generative AI is massive — so why are most projects stuck in pilot? Backed by extensive third-party research, learn the data challenges slowing gen AI initiatives, and five proven strategies to overcome them.

Download the white paper ->

Ready to learn more?

Get in touch with our sales team to learn more about what Sigma Data can do for your business.

Related resources

Article

Training data for machine learning: here’s how it works

Article

Addressing data challenges with AI-powered solutions

Article

Medical image annotation: goals, use cases & challenges

Our other services

Truth

Ground your models in reality. Our experts validate facts, correct inaccuracies, and prevent hallucinations using workflows like ground truth, attribution, and factual rewriting.

Learn about Sigma Truth

Meaning

Language is more than words. We deliver transcription, translation, and cultural calibration so your models grasp intent, nuance, and local relevance — across 700+ languages and dialects.

Learn about Sigma Meaning

Integration

Teach your model to think in context. We support multimodal labeling, prompt engineering, iterative refinement, and RLHF — ensuring your AI reasons, not just reacts.

Learn about Sigma Integration

Perception

Align outputs with human expectation. We annotate tone, intent, and emotion — and run side-by-side evaluations to help your models speak with empathy, not just accuracy.

Learn about Sigma Perception

Protection

Build AI that’s safe by design. Our teams detect and remove PII, enforce data compliance, and perform red teaming to expose vulnerabilities before attackers do.

Learn about Sigma Protection

EN
ES EN