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Mariana Z.

Mariana Z.

AI Data Annotator | LLM Training, Data Labeling & Quality | EN-PT-ES

I work with AI data annotation and LLM training, focusing on accuracy, consistency, and quality. I currently collaborate with Innodata, where my work includes labeling and validating data, reviewing model outputs, and following detailed annotation guidelines across different types of tasks. Most of my day-to-day work involves text classification, content tagging, quality checks, and evaluating AI responses based on specific criteria. I’m used to working with large volumes of data and understand how important attention to detail and consistency are in this type of work. I’m comfortable handling repetitive tasks, edge cases, and unclear examples while keeping decisions aligned with project rules. I also have a legal background, which helps a lot when tasks involve complex instructions, policy interpretation, or sensitive content. It trained me to read carefully, apply rules consistently, and justify decisions when needed. I’m reliable, organized, and comfortable working on both short tasks and long-term projects. If you need someone who follows guidelines closely and delivers clean, consistent work, I’d be happy to help.

🇧🇷Sao Paulo, Brazil$10/hr100% JSS5.00 (2)Since Oct 2023

Earnings and projects

MRR
$349

Last 6 months ÷ 6

World#92,306 / 412k
🇧🇷Country#1,112 / 4,647
Revenue, last 30 days
$539

Last 6 months: $2.1k

World#60,879 / 412k
🇧🇷Country#740 / 4,647
Total earnings
$6.3k

Billed in all: $8.2k

World#234,582 / 412k
🇧🇷Country#2,494 / 4,647
Per project
$1.6k

$1k in the last 6 months

World#91,462 / 412k
🇧🇷Country#1,035 / 4,647
Projects, last 6 months
2
100% fixed0% hourly
World#88,918 / 412k
🇧🇷Country#908 / 4,647
Projects in all
4
75% fixed25% hourly
World#283,741 / 412k
🇧🇷Country#2,759 / 4,647

Earnings, last 30 days

$8.2k+$521 earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$7.5k$8.0k$8.5kOct 9Oct 24Nov 8

No data since Nov 6, 2026.

Skill rankings: Top 17% in Proofreading

Ranked by MRR among everyone on Upwork with the skill.

  1. #38Intercultural Communication166 freelancers · 🇧🇷 #5Top 23%
  2. #207Portuguese987 freelancers · 🇧🇷 #105Top 21%
  3. #273Legal Translation1,249 freelancers · 🇧🇷 #14Top 22%
  4. #413Academic Research2,302 freelancers · 🇧🇷 #6Top 18%
  5. #835Spanish3,288 freelancers · 🇧🇷 #23Top 25%
  6. #2,593Proofreading14,990 freelancers · 🇧🇷 #67Top 17%
  7. #4,963Project Management18,568 freelancers · 🇧🇷 #67Top 27%
  8. #13,948Data Entry53,630 freelancers · 🇧🇷 #87Top 26%