Welocalize · Software & coding
Project Lion - Senior Prompt Engineer - Spain (Remote, Part-Time)
Listed on Welocalize as “Project Lion - Senior Prompt Engineer - Spain (Remote, Part-Time)”
What this actually is
You review AI-generated code, rank model outputs against each other, write prompts that test edge cases, and provide expert feedback that gets used to train coding models. Not shipping production software. The platform title (Project Lion - Senior Prompt Engineer - Spain (Remote, Part-Time)) reflects the rate band and the expertise required, not the day-to-day work.
How Welocalize picks people
- Apply to Welo Data's AI Trainers Network and describe your skills.
- Take a skills test in your area.
- If you pass, you get access to projects that match your skills. You confirm your payment details when a project starts.
Before you start
- Welo Data says it does not ask applicants to pay fees.
- There are no minimum hours. Pay depends on the task and how much work there is.
Not every applicant gets an offer. Prepare well for the interview.
Source: Welocalize's help pages. welodata.ai
Can you do this on your visa?
F-2 / F-4 / F-5 / F-6: open. E-1 to E-7: needs concurrent-employment permit. D-2 / D-4 students: S-3 permit, 20 hr/week cap. D-10 / D-8: case by case.
Korean tax on USD income
First 5 years in Korea: foreign-source income only taxed if remitted into Korea. After year 5: worldwide income. Full tax guide.
Original posting from Welocalize
We are seeking a Prompt Engineer to be responsible for the end-to-end technical migration workflow for transitioning templates to LLM autoraters. The role is required to use client’s internal tools to leverage prompt engineering techniques to maximize model performance.
Quoted from Welocalize's public listing on 2026-11-13. We don't edit platform copy; honest framing is in the title and the “what this actually is” block above.
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More on this platform
About Welocalize
Language QA at scale. Translation evaluation, speech labeling, multilingual prompt review. Pay is hourly and predictable; project supply is steady for working language pairs.
Is Welocalize legit? Our review
A localization company founded in 1997, not a task marketplace. Scheduled rater work with bounded weekly hours, steadier but lower pay than Outlier or Alignerr ceilings, and a residency catch on Korean-language roles worth checking before you apply.
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