Applying to Sigma AI · researched 15 Oct 2026
How to apply to Sigma AI
Find the project for your language on careers.sigma.ai, click Apply for this job, complete the mandatory tests Sigma emails you (check spam), provide any identity and credential documents it asks for, then sign a freelance commercial contract and work remotely on Sigma's online platform; Sigma publishes no pay rate or payment terms, so ask for them before you start.
, AITraining.jobs lists 90 open Sigma AI roles.
Applying to Sigma AI, step by step
Researched October 2026Find the project for your language on careers.sigma.ai, click Apply for this job, complete the mandatory tests Sigma emails you (check spam), provide any identity and credential documents it asks for, then sign a freelance commercial contract and work remotely on Sigma's online platform; Sigma publishes no pay rate or payment terms, so ask for them before you start.
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
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
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
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
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
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
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
Language tests emailed after you apply
Every remote post says that after you apply you receive an email with the required tests, and that they are mandatory to move forward. Sigma says it may use AI systems to evaluate them, for instance the transcribed content you provide. Sigma does not publish what the tests contain, how long they take, the pass mark or whether they are paid; applicants on Trustpilot describe transcribing test audio clips and, for some roles, a translation test.
Format
Emailed tests in the project's language. Applicant reports describe audio transcription (one says five audio files) and, for translator roles, a translation test with its own guideline.
How to prepare
- Check your inbox and spam folder right after applying: the tests arrive by email.
- Transcribe exactly what you hear and spell everything correctly. Every post asks for people able to listen and write without spelling mistakes.
- Use headphones in a quiet place on a computer that meets the post's requirements (4GB of RAM, microphone, updated Windows 10 or macOS 13).
- Read the test guidelines in full before you start, and ask questions early: one applicant said a translation guideline was confusing and his email asking for clarification went unanswered.
- Have your ID and any degree certificate ready, since Sigma may ask for proof of identity and credentials.
Why people get rejected
- Spelling mistakes or an inaccurate transcription, the one skill every post insists on.
- Not completing the mandatory tests, or missing the email in a spam folder.
- Not giving enough evidence of identity or credentials: Sigma says it may then withhold or terminate an offer.
- Equipment that does not qualify, such as an iPhone or a tablet for an audio-collection project.
Sigma publishes no timeline from application to first paid work, and no step tells you when you have been turned down. Some applicants on Trustpilot say they finished the tests and never heard back. Projects also differ widely in size, so being accepted onto one may not mean ongoing work.
Sigma does not publish how or when freelancers are paid. Its posts offer remote work to freelancers under a commercial contract, and none of the 95 posts on its careers feed on 15 October 2026 stated a rate. Ask for the rate, its unit (per hour, per audio minute or per task), the payment method and the schedule in writing before you start.
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.
What isn't public
- Sigma publishes no pay rates: none of its 95 posts on 15 October 2026 stated one. It also publishes no payment method, schedule, currency or minimum for freelancers.
- It does not say what its tests contain, how long they take, how they are scored or whether they are paid; Trustpilot reviewers describe them as unpaid.
- There is no published timeline and no stated way you are told you were not selected; some applicants say they never heard back after the tests.
- Which Sigma company signs your contract (Spain, the UK or the US) is not stated in the posts; one reviewer says hers came from the US office.
- Sigma's own figures disagree: its FAQ and About page say it was founded in 2008 and covers 500+ languages with 25,000+ annotators, its homepage says 18+ years, 700+ languages and 70,000+ experts, and its job posts claim over 30 years of experience.
- The 15 on-site London posts do not say whether they are freelance or employment, and do not describe the remote tests.
- Public worker reviews are few: Trustpilot had 7 reviews of sigma.ai on 15 October 2026, and we could not read Glassdoor or Indeed. A second Trustpilot profile (sigma-ai.com, named Sigma Technologies) carries similar complaints, but we could not confirm it is the same company, so it is not used here.
Sources (9)
- Sigma AI Careers: job feed (95 posts, read October 15, 2026)
- Sigma AI Careers: Venezuelan Spanish linguistic projects (Remote), posted September 29, 2026
- Sigma AI Careers: Romanian Translator (Remote)
- Sigma AI Careers: French Audio Collection Projects (Remote)
- Sigma AI Careers
- Sigma AI: FAQs (founded 2008 in Madrid, offices, languages)
- Sigma AI: About
- Sigma AI: homepage
- Trustpilot: sigma.ai reviews, all languages
What Sigma AI's application form asks
An application form at Sigma AI has a median of 17 fields (10 on other platforms' forms); 98.9% of its 90 forms require a resume, none ask for a LinkedIn profile and all add questions of their own.
What an application to Sigma AI asks for
What does an application to Sigma AI ask for, and what must be filled in?
| Item | Its forms asking | Its forms requiring it |
|---|---|---|
| Cover letter | 0.0% | |
| Other file uploads | 0.0% | |
| Phone number | 70.0% | |
| Resume or CV | 98.9% | |
| Location or country | 84.4% | |
| Current employer | 0.0% | |
| GitHub profile | 0.0% | |
| LinkedIn profile | 0.0% | |
| Portfolio or website | 0.0% |
The questions Sigma AI adds to its form
What does Sigma AI ask applicants beyond a resume?
| Question theme | Its forms asking | Other platforms' forms asking |
|---|---|---|
| Degree or field of study | 7.5% | |
| Languages spoken or fluency | 22.1% | |
| Experience or years in a field | 9.3% | |
| Prior AI training or annotation work | 2.2% | |
| Work authorization or visa sponsorship | 5.0% | |
| Age or being over 18 | 0.4% | |
| Availability, hours or start date | 3.3% | |
| Expected pay or rate | 11.0% | |
| How you heard about the role | 0.1% |
What Sigma AI's roles ask for
Of the 90 roles Sigma AI lists with a full description, 0.0% mention a PhD or master's degree, 0.0% a professional credential and 0.0% an assessment or test (other platforms with descriptions: 26.2%, 10.8% and 15.1%).
Do the roles Sigma AI lists ask for degrees, credentials, experience, set hours or tests?
| The description | Its roles | Share of its roles read | Other platforms with descriptions |
|---|---|---|---|
| Mentions a PhD or doctorate | 0 | 17.9% | |
| Mentions a PhD or master's degree | 0 | 26.2% | |
| Mentions a degree | 23 | 38.1% | |
| Mentions a professional credential | 0 | 10.8% | |
| States years of experience | 89 | 23.8% | |
| States weekly hours | 0 | 24.1% | |
| Mentions an assessment, test or trial task | 0 | 15.1% | |
| Mentions an interview of any kind | 0 | 9.7% | |
| Mentions an AI-led or recorded interview | 0 | 4.7% | |
| Mentions a background or identity check | 0 | 0.9% | |
| Mentions contractor or freelance terms | 0 | 56.0% |
Where you can apply to Sigma AI from
None of its 90 open roles are open to applicants in any country (29.2% on other platforms); all are limited to listed countries, most often the United Kingdom (named by 52.2%).
Are the roles Sigma AI lists open to applicants anywhere, or limited to some countries?
| Location rule | Its open roles | Share of its roles | Share on other platforms |
|---|---|---|---|
| Open worldwide | 0 | 29.2% | |
| Worldwide except listed countries | 0 | 9.5% | |
| Only listed countries | 90 | 60.9% | |
| No rule stated | 0 | 0.4% |
How long Sigma AI's roles stay open
From 20 Sep 2026 to 17 Oct 2026, Sigma AI posted 23 new listings and removed 4; its open roles went from 71 to 90 (+26.8%).
How long had the roles Sigma AI removed been listed?
| Days listed | Removed roles | Share |
|---|---|---|
| Under 7 daysSmall sample | 2 | |
| 7 to 13 daysSmall sample | 1 | |
| 14 to 29 daysSmall sample | 0 | |
| 30 to 59 daysSmall sample | 0 | |
| 60 days or moreSmall sample | 1 |
Sigma AI roles to apply to now
All 90 open rolesEnglish Linguistic Projects (On-site London) (opens the job details)
Multilingual · London, United Kingdom· 2w agoDetails
Swedish Linguistic Projects (On-site London) (opens the job details)
Multilingual · London, United Kingdom· 2w agoDetails
Slovak Linguistic Projects (On-site London) (opens the job details)
Multilingual · London, United Kingdom· 2w agoDetails
Cantonese Chinese (Traditional script) Linguistic Projects (On-site London) (opens the job details)
Multilingual · London, United Kingdom· 2w agoDetails
Serbian Linguistic Projects (On-site London) (opens the job details)
Multilingual · London, United Kingdom· 2w agoDetails
Nepali Linguistic Projects (On-site London) (opens the job details)
Multilingual · London, United Kingdom· 2w agoDetails
Some links on AITraining.jobs are referral links. If you sign up through one, AITraining.jobs may earn a commission at no extra cost to you. It never changes what a platform pays you.
Applying to Sigma AI: questions
How do I get accepted on Sigma AI?
Apply to the post for your language on careers.sigma.ai, complete the mandatory tests Sigma emails you, and provide any identity and credential documents it asks for. Remote work is then offered to freelancers under a commercial contract.
Does Sigma AI have a test?
Yes. After you apply, Sigma emails you the required tests, which are mandatory, and says it may use AI to evaluate them, for instance your transcribed content. It does not publish their length, pass mark or whether they are paid.
How much does Sigma AI pay?
Sigma does not say. None of the 95 posts on its careers feed on 15 October 2026 stated a rate, so ask for the rate and its unit (per hour, per audio minute or per task) in writing before you start.
How does Sigma AI pay its freelancers?
Sigma publishes no payment method or schedule. Trustpilot reviewers describe transcription paid per minute of audio; one says payments are regular, while others describe unpaid tests, unpaid meetings and unpaid hours.
Can I work for Sigma AI from home?
Yes, for most projects. On 15 October 2026, 80 of the 95 posts on its careers feed were remote and 15 were on-site in London.
What equipment do I need for Sigma AI?
A computer with at least 4GB of RAM, a microphone and webcam, Windows 10 or macOS 13 Ventura or later, headphones and stable internet. Audio-collection projects also need an Android phone; tablets and iOS devices are not supported.
Do I need a degree to work for Sigma AI?
Not for most linguistic projects, which ask for fluency, correct spelling and basic computer skills. Translator roles are stricter: the Romanian Translator post asks for a Bachelor's degree in Translation and Interpretation.
How long does it take to hear back from Sigma AI?
Sigma publishes no timeline from application to first paid work, and no step tells you when you have been turned down. Some applicants on Trustpilot say they finished the tests and never heard back. Projects also differ widely in size, so being accepted onto one may not mean ongoing work.
Does Sigma AI have an assessment?
Yes: Language tests emailed after you apply. Every remote post says that after you apply you receive an email with the required tests, and that they are mandatory to move forward. Sigma says it may use AI systems to evaluate them, for instance the transcribed content you provide. Sigma does not publish what the tests contain, how long they take, the pass mark or whether they are paid; applicants on Trustpilot describe transcribing test audio clips and, for some roles, a translation test.