Sigma AI

Who can join

• Native or fluent command of the project's language, able to listen and write without spelling mistakes. Most remote projects also ask for fluent English and basic computer skills; experience in data annotation or content rating is preferred but not required.
• For translator roles, more: the Romanian Translator post asks for a Bachelor's degree in Translation and Interpretation, native or near-native Romanian, fluent English and a solid command of linguistic theory and grammar.
• A computer with at least 4GB of RAM, a microphone and webcam, Windows 10 or macOS 13 Ventura or later with all updates, a stable internet connection, headphones and a secure, password-protected internet location. Audio-collection projects also need an Android phone; tablets and iOS devices are not supported.
• Documents that prove your identity and credentials. Every post says the candidate agrees to provide them on request, and that Sigma may withhold or terminate an offer if the evidence is not enough.
• Willingness to work as a freelancer: remote projects are offered under a commercial contract, not employment.
• For some projects, being in London: on 15 October 2026, 15 of the 95 posts on Sigma's careers feed were on-site in London, and they ask for English good enough to work in an office.

Step by step

1. 1

   Find the post for your language

   Sigma recruits per language and per variety, not through one general sign-up. On 15 October 2026 its careers feed held 95 posts: 80 remote and 15 on-site in London, including seven Spanish varieties (Venezuelan, Argentinian, Peruvian, Colombian, Chilean, Mexican and Costa Rican) posted in late September.

2. 2

   Check the requirements and your equipment

   Read the language, skills and technical requirements in the post before you apply. Audio-collection work needs an Android phone or a Windows computer; tablets and iOS devices are not supported.

3. 3

   Apply on careers.sigma.ai

   Click 'Apply for this job' and follow the instructions. Apply directly: Sigma says it does not hire through third parties, and no agents or intermediaries are authorized to take part in the relationship.

4. 4

   Complete the emailed tests

   After you apply, Sigma emails you the required tests, which are mandatory to move forward; check your spam folder too. Sigma says it may use AI systems to evaluate the tests, for instance the transcribed content you submit.

5. 5

   Send identity and credential documents if asked

   Sigma can ask for any documentation it reasonably needs to verify who you are and your credentials, and may withhold or end an offer without it.

6. 6

   Read and sign the freelance contract

   Remote work is offered to freelancers under a commercial contract. One December 2025 Trustpilot reviewer says her contract came through Sigma's US office with one-sided clauses and urges legal advice before signing, so read it closely and ask about the rate and payment terms first.

7. 7

   Start work on Sigma's platform

   All tasks are remote, on an online platform available 24/7. Some projects are short: the French voice-command audio project asks for 500 short utterances over two recording sessions, about 2.5 hours in all, with project manuals and optional kick-off sessions.

Tips to get accepted

• Apply only through careers.sigma.ai. Sigma says it does not hire through third parties, so anyone offering Sigma work through an agency, a fee or a chat app is not Sigma.
• Apply to every post that matches your languages. Sigma recruits per language and variety, and combinations such as Arabic, French and English or Hindi, Tamil and English have their own posts.
• Ask for the rate before you put hours into tests or work. Reviewers describe transcription paid per minute of audio, unpaid meetings and tests, and one says his wife had not been paid for about 80 hours over two weeks.
• Read the freelance contract before signing and question anything one-sided; one reviewer recommends getting legal advice first.
• Keep an Android phone available if you want audio-collection projects: they do not support iOS devices or tablets.
• Use the project manuals and optional kick-off sessions that audio projects offer to clear up technical or procedural questions before you record.