Leaders in annotation data quality since 2008

Sigma is a global training data collection, preparation and annotation services company. For companies building the next generation of AI, we provide highest quality training data at scale, with a human touch. With 30+ years of experience in the data annotation space, we support companies with the right mix of people, processes and technology to train smarter AI that serves humans better.

Why Sigma

Guaranteed accuracy

Through our experience, proven processes, professional annotators and quality assurance, we guarantee 98% accuracy - 99.99% if needed.

Problem solvers

We thrive on complexity and love a challenge. Come to us with your toughest annotation projects and we’ll help you find the right approach.

Annotation excellence

We vet and train our own diverse workforce of 25,000+ annotators, linguists, project managers and subject matter experts across 5 continents.

Security commitment

World leaders in secure facilities design, implementation and operation, we are ISO 27001 and SOC-2 certified and 100% GDPR compliant.

Customers first

We custom-fit our processes to fit your unique project - from curated annotator teams down to our data labeling and process automation tools.

Quality at scale

Covering 500+ languages and dialects, our annotators and linguists analyze 200+ million video frames and over a million words a day.

Deep AI research meets real-world purpose: our founding story

After 18 years of research in the speech recognition and natural language processing fields, Sigma founder Daniel Tapias made strides in the 90s applying his research in groundbreaking projects at telecommunications companies. But quickly he realized his views on AI training data quality diverged from the norm. To him, training data quality didn’t just mean accuracy – having balanced datasets with adequate coverage and consistent rules around annotation were just as important.

In 2008, Daniel founded Sigma with his business partner Nuria Gómez with the aim to train AI with data that was better – more balanced, less biased, and more representative of the populations that AI is meant to serve.

Sigma founded in Madrid
First contract with a major Silicon Valley company
Sigma.AI LLC incorporated in the U.S.
Opening of office in San Francisco
Set up first secure data facility
GDPR certification
10,000 annotators vetted, hired and trained
500,000 video frames analyzed
ISO 27001 certification
20,000 annotators vetted, hired and trained
Over 300 languages and dialects interpreted
Opening of office in London

Executive team

Dr. Daniel Tapias

Co-Founder and CEO

Serial AI entrepreneur and researcher with over 30 years of experience in the field, Tapias believes that AI is only worthwhile when it’s helping people. With a focus on speech and language technologies, he applied his expertise from years of research to some of the first real-world applications of speech recognition in telephone services in the early 1990s. He lead major AI initiatives as Head of UX at Telefónica Movistar and Innovation Strategy Consultant at Telefónica before breaking out as a founder, with ventures including Agnitio, Sigma.AI, and Sigma Cognition.

Tapias holds a PH.D. in electrical engineering from Universidad Politécnica de Madrid. He is co-author of three books on speech and language technologies, published over 50 papers, and taught more than 30 courses as an adjunct professor at the Universidad Autónoma de Madrid.

Nuria Gómez

Co-Founder and CFO

With over 25 years experience in business consulting for taxation, accounting, and company acquisition and sale, Gómez is currently Founder & CEO of Tax Planning in addition to her role as CFO of Sigma. She has extensive international experience with US and EU multinational companies, and leads Sigma’s internationalization efforts, managing the incorporation of Sigma.AI LLC (formerly known as Sigma Technologies Global, LLC) in San Francisco in 2014.

An expert in domestic taxation in Spain, double taxation treaties, audit processes and international accounting principles, Gómez holds degrees in Economics and Business (Universidad Complutense de Madrid) as well as Tax Consultancy for enterprises (Centro de Estudios Financieros). She previously held management positions for tax consultancy at enterprises such as Cableurope (ONO Group) and Coopers & Lybrand (PwC).

Dr. Jean-Claude Junqua

Executive Senior Advisor

Junqua has a track record of managing and leading groundbreaking innovations resulting in positive growth and profit, with over 25 years of experience as a global executive in the US, Europe and Japan. As Vice President of Panasonic R&D for North America, he established Pansonic’s research and development activities in Silicon Valley. After leading an internal startup at Panasonic, he has helped numerous startups and public companies innovate and reach their next level of growth. He is convinced that mission, purpose, social good and a collaborative customer-oriented culture are key ingredients for sustainable success.

Junqua is the inventor or co-inventor of more than 100 patents and has authored 100+ peer-reviewed articles and 3 books on speech recognition and corporate and startup innovation.

Antonio Hornero

Chief Operations Officer

As COO, Hornero leads the multinational project management teams that deliver highest-quality annotation data to Sigma’s clients. He is an expert at data-driven process optimization and problem solving, providing insights to project management practices, training and recruiting.

Hornero has a Master’s degree in Mathematics, an executive MBA in Economics, a postgraduate in Corporate Finance & Venture Capital and a PADE-AMP in Business/Managerial Economics. Previously, he was CFO and COO at manufacturing companies Electrosteel and Steel Beton, and held director-level positions at KPMG and Unisys.

Dr. Jesús Bernat

Chief Technology Officer

With a deep background in speech recognition, internet of things and insurance telematics, Bernat believes in using his passion for technology to help people and organizations. At Sigma, he leads the product teams in creating the suite of machine learning and automation technologies that make highest-quality annotation possible at a massive scale.

Before Sigma, Bernat held positions from CTO to innovation and people manager to researcher and lead developer — a combination of perspectives which give him a broad vision of technology within organizations. He obtained his Computer Science degree from Universidad Politecnica de Valencia and his PhD in IoT from the Universidad Politécnica de Madrid, and has over 25 years of experience in AI, IoT and speech recognition.

Pilar Plasencia

Chief Legal Officer

Plasencia is a lawyer with over 20 years of experience working with corporates and startups developing innovative technologies. She is an expert in telecommunciations and new technology law, corporate law, data protection, intellectual property rights, technology transfer and licensing, national and international contracting, and more.

Building her professional career at Telefónica, Plasencia’s responsibilities included leading the Legal Department, acting as Secretary of the Board of Directors for the Research and Development Center, and serving as Head of the Legal Department in the Product Innovation Unit. Plasencia holds a law degree from the Universidad Autónoma de Madrid, a Master’s in business consultancy and labor law from the Escuela de Práctica Jurídica, and a Master’s in new technology law and intellectual property rights from the Instituto de Empresa — among other courses and masters.

Let’s work together to build smarter AI

Whether you need help sourcing and annotating training data at scale, or you need a full-fledged annotation strategy to serve your AI training needs, we can help. Get in touch for more information or to set up your proof-of-concept.