Bulgarian Linguistic Projects (On-site London)

Sigma; Greater London; Hybrid; GBP 14,000 - 21,000; Full time

Job summary

Sigma.AI is hiring for linguistic data annotation roles in the United Kingdom. You will be involved in categorization, annotation, transcription, evaluation, and content localization across multiple media formats.

Applicants should be native or bilingual in Bulgarian, fluent in English, and possess basic computer skills. Experience in data annotation is a plus; remote work is not indicated. This is a privacy‑conscious selection process by Sigma.AI.

Qualifications

• Native or bilingual in Bulgarian with accurate listening and writing
• Fluent in English with ability to interact in an office setting
• Basic computer skills

Responsibilities

• Categorization, annotation, correction, transcription, and evaluation of data.
• Contribute to localization, validation of audio/video/text and related content.

Skills

Bulgarian (native/bilingual)

English (fluent)

Basic computer skills

Job description

Join Sigma.AI – Shaping the Future of Artificial Intelligence

What is Sigma?

Sigma is a leading global technology company specialized in data collection and annotation for Artificial Intelligence. With over 30 years of experience, offices in Spain, the US, and the UK, and operations in more than 200 languages, we support top multinational clients in developing cutting‑edge AI solutions.

Soft skills we value:

Are you a proactive professional who thrives on challenges, values collaboration, and approaches every task with empathy, integrity, and a passion for learning?

If so, we’d love to hear from you!

What will you do?

As part of our linguistic projects, your responsibilities may include: Categorization – Annotation – Correction – Transcription – Evaluation – Conversational interactions – Voice recording – Content creation – Localization – Validation of audio, video, images, sentences, or words.

Requirements:

We are looking for candidates with the following qualifications:

• Native or bilingual in Bulgarian – Able to listen and write correctly without spelling mistakes
• Fluent in English – Able to interact efficiently in the office environment.
• Basic computer skills.

Preferred (but not mandatory):

• Experience in data annotation or content rating.
• Strong attention to detail.

Important Notes

Sigma.AI does not hire through third parties. No agents’ intermediaries or third parties are authorized to represent benefit from or participate in any way in the relationship. To this effect the Candidate agrees to provide any documentation or information reasonably requested by the Company to verify their identity and credentials. Should the Candidate fail to provide enough evidence of their identity to Sigma´s satisfaction, Sigma shall be entitled to withhold or terminate any offer with the Candidate.

The company may employ or rely on artificial intelligence systems in its selection processes. Such processing is carried out in an ethical, transparent, and legally compliant manner. The purpose of the processing is to evaluate the tests submitted in the course of the selection process (for instance the transcribed content provided by the candidate). The legal basis for processing your data is the pre-contractual relationship between the parties and/or the provision of requested services.

Need Help?

We’re here for any questions or concerns.

Join us and be part of something global, innovative, and impactful.

Sigma.AI – Data done right.