Complex AI needs a human-first partner. That’s our mission.
Sigma exists for one reason: to solve the most complex data challenges in AI—with human context, strategic clarity, and service you can count on.
Where most annotation vendors stop at task execution, we go further. We design, adapt, and optimize everything around your goals: from team structure to tooling to process refinement. Our team’s decades of experience—combined with our clients’ toughest problems—continues to push the limits of what’s possible in data annotation for generative and agentic AI.
Seven reasons to choose Sigma
1. Quality you can see—and trust
We go beyond measuring accuracy. In the GenAI era, annotation quality includes truthfulness, coherence, tone, bias detection, and more. Sigma is a pioneer in building multi-dimensional quality frameworks designed for LLM outputs—especially where ground truth is ambiguous or evolving.
Our human-in-the-loop systems are engineered for:
- Deep QA, not just pass/fail scoring
- Continuous improvement through real-time feedback loops
- Systematic error identification, not just spot checks
→ Learn more: Establishing ground truth data for machine learning success
2. Flexibility and problem-solving in your domain
We don’t expect your challenge to fit our process—we build the process to fit your challenge.
From custom guideline development to synthetic dataset augmentation, we collaborate closely with clients to solve edge cases, shift tasks mid-project, or adapt to new model capabilities. We’ve supported:
- Multilingual red-teaming
- Narrative structure evaluation
- Low-resource language transcription
- Reasoning and hallucination detection
→ Learn more: Data annotation for search algorithm development
3. Core values that scale quality with humanity
Our values are not just internal—they show up in the data we annotate.
- We hire for attention to detail, empathy, and ethical reasoning
- We train teams to consider bias, intent, and impact
- We promote inclusion through our global workforce: 72% women, 100+ countries, 300+ dialects
This human-centered approach ensures that AI systems don’t just function—they reflect the people they’re meant to serve.
→ Learn more: Human annotators in AI: Adding context & meaning to raw data
4. Speed and scalability, without compromise
Need to scale annotation in multiple languages, modalities, or output types—fast?
With 25,000+ vetted annotators and modular workflows built for parallelism, we deliver quality at speed. Whether your project demands 10,000 responses labeled in a week or rapid-turnaround feedback for daily LLM tuning, we can ramp up in days without sacrificing consistency.
→ Learn more: Transcripción de vídeo escalable en 24 dialectos
5. Privacy and security built for enterprise AI
Sigma is trusted by top organizations in healthcare, finance, and government because we meet the highest standards in data security:
- ISO27001 and SOC 2 Type II certified
- 100% GDPR compliant workflows
- Secure on-premise annotation facilities and isolated cloud instances
- Annotator vetting, NDAs, and zero crowdsourcing
→ Learn more: Designing secure facilities: Annotating user data
6. Service and experience you won’t find elsewhere
With 30+ years in data annotation, our team has helped shape the standards of the industry. That experience shows up in:
- Strategic consulting to structure your annotation roadmap
- Dedicated project managers for hands-on collaboration
- Deep familiarity with evolving LLM tasks and evaluation benchmarks
We don’t just “run projects”—we run with you.
→ Learn more: The hidden humans in the loop behind quality GenAI
7. A human-centric approach to AI that’s built to last
Sigma was founded on the belief that AI must understand humans, not just language. We’re here to teach models how to speak with clarity, act with empathy, and evolve with context.
Through our service lines—Truth, Perception, Protection, Integration, Meaning, and Data—we help the world’s leading AI teams create systems that are safer, smarter, and more aligned with real-world needs.
→ Learn more: How GenAI is transforming human data annotation
Bring us your challenge. We’ll bring the solution.
At Sigma, we turn complexity into clarity.
Let’s work together to build AI that’s human-informed, enterprise-ready, and future-proof.