Mercor · Software & coding
UK Based Software Engineers (COBOL)
Listed on Mercor as “UK Based Software Engineers (COBOL)”
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 (UK Based Software Engineers (COBOL)) reflects the rate band and the expertise required, not the day-to-day work.
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 Mercor
Mercor is recruiting U.K.-based Software Engineers for a research project with a leading foundational model AI lab.
You are a good fit if you:
- Have experience in COBOL
- Have at least 5 years of full-time software engineering experience
- Have work experience at a big tech company (e.g., Slack, Notion, Stripe, Figma, etc.)
- Are currently based in the U.K.
Here are more details about the role:
- You will be contributing to high-quality training data for frontier AI systems alongside a team of senior engineers
- The work is fully remote and project-based
- You are available to work 40 hours/week
- Successful contributions increase the odds that you are selected on future projects with Mercor
The vetting process involves:
- Resume + work history screen
- Short technical assessment evaluating engineering expertise
Quoted from Mercor’s public listing on 2026-07-07. We don’t edit platform copy; honest framing is in the title and the “what this actually is” block above.
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About Mercor
AI-interview-based talent network. One application, voice interview with their AI, then matched to projects across coding, research, and specialist work. Pay scales with track and seniority.
Mercor review: AI-interview talent network
4.1/5 on Glassdoor, fastest-growing platform in the category (+509% YoY). What the AI video interview actually asks, real pay across coding/research/medical/legal/finance tracks ($25-$200/hr), and the project-availability problem.
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